The Dissertations Sticky

For the discussion of catfish systematics. Post here to draw our attention to new publications or to discuss existing works.
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Ichthyoacanthotoxins: Toxins released from pectoral fins

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Padmi, Ni Komang Ayu Oka. 2015. Ichthyoacanthotoxins pada Beberapa Jenis Catfish: Clarias gariepinus (Clariidae), Pangasius hypophthalmus (Pangasidae), Plotosus canius (Plotosidae). Thesis, IPB-Bogor Agricultural University.
ABSTRACT
Ichthyoacanthotoxins are toxins released through the pectoral fins (horn) by venomous fish. Order Siluroidea like CLARIAS GARIEPINUS, PANGASIUS HYPOPHTHALMUS, and PLOTOSUS CANIUS generally have pectoral fins as a defense mechanism. The research was conducted from February 2014 through September 2014 to determine anatomical structure of the venom gland and the chemical composition (acanthotoxins) present in the pectoral and dorsal spine. The results of histological analysis showed that the anatomical structure pectoral and dorsal spine consists of pieces of muscle, adipose layer, blood vessels, and there is a venom gland at CLARIAS GARIEPINUS with a long shaft, which is 1612.48 μm. The results showed that the proximate analysis, protein content of PLOTOSUS CANIUS is higher than the protein content of CLARIAS GARIEPINUS and PANGASIUS HYPOPHTHALMUS, while the fat content of CLARIAS GARIEPINUS higher than the fat content of PANGASIUS HYPOPHTHALMUS and PLOTOSUS CANIUS.
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Host-parasite interactions of Synodontis multipunctatus

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Cohen, MS, 2015. Host-parasite interactions of the African cuckoo catfish (Synodontis multipunctatus). PhD dissertation, University of Colorado at Boulder, 117 pp.

Abstract

Obligate brood parasitism (completely relying upon a host for successful breeding) has been studied in insects and birds, with a considerable amount of research concentrating on birds such as cuckoos and cowbirds. The Lake Tanganyikan cuckoo catfish (Synodontis multipunctatus Siluriformes: Mochokidae) is the only known non-avian obligate brood parasite among vertebrates, and it uses female mouthbrooding cichlids (Perciformes: Cichlidae) as hosts. Although the basic breeding mechanism of the cichlid-cuckoo catfish system has been well documented through a series of observational studies, there have been few manipulative experiments concentrating on host-parasite interactions. The goal of my dissertation work was to examine this parasitic relationship from the perspectives of both the host and the parasite in the context of ecology and coevolution. Specifically, I was interested in how hosts avoid or mitigate parasitism, as well as features of the parasite that allow for successful parasitism. First, I assessed parasitism frequencies among cichlid hosts and discovered that sympatric Lake Tanganyikan hosts were parasitized significantly less than allopatric hosts from other lakes in laboratory conditions, possibly explained by subtle differences in mating ritual and oviposition, or increased aggression by sympatric hosts. Next, I compared unparasitized and parasitized broods to show that the cuckoo catfish indiscriminately parasitize all sizes of host, followed by complete elimination of host progeny and subsequent cannibalism while being brooded in the host mouth. Finally, using live fish and video playback techniques, I found that visual cues play an important role in breeding synchrony between the cuckoo catfish and cichlid hosts. Together, my dissertation provides the groundwork for using this unique cichlid-cuckoo catfish system as a model for studying brood parasitism in controlled laboratory conditions, where questions regarding parasitism dynamics in the context of both ecology and coevolution can be addressed.
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Auchenpterid phylogeny

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Calegari, BB, 2015. Sistemática filogenética dos bagres Auchenipteridae (Ostariophysi: Siluriformes): uma abordagem combinando dados morfológicos e moleculares. PhD dissertation, Pontifícia Universidade Católica do Rio Grande do Sul.

Abstract

The Auchenipteridae have an extensive and confusing taxonomic and phylogenetic history. Several studies developed since 1766 involving descriptions of species generated controversial results about the composition of the family and their interrelationships. The weakness of the systematic knowledge and diversity of the family hinders the understanding about the evolutionary history since the informative potential of morphology, molecules and biogeography was not yet fully explored. A comprehensive and densely sampled phylogenetic study of the species relationships of the Auchenipteridae, a Neotropical family of inseminating catfishes, is here documented based on combined datasets, morphological and molecular. The present study aimed to include most species of Auchenipteridae (109 species), as well as several members of other siluriform families representing the outgroup (28 species comprising Mochokidae, Aspredinidae, Doradidae, Ariidae, Pimelodidae, Cetopsidae, and Diplomystidae) to embrace the greater diversity of forms existing within Siluriformes, providing a robust comparison between the taxa and providing therefore a series of information from different sources including morphology (261 characters) and molecular data (2814 characters based on four genes: COI, 16S, RAG2, and MyH6).The parsimony analysis based on combined data yielded 1691 maximally parsimonious trees and the strict consensus corroborated the monophyly of the superfamily Doradoidea, the family Auchenipteridae and its two subfamilies, Centromochlinae and Auchenipterinae as well. The new classificatory proposal also raises the number of tribes within Auchenipteridae from two to nine, evidencing the following major groups within Auchenipterinae: Liosomadoradini, Trachelyopterini, Asterophysini, Auchenipterini, and Ageneiosini; and in Centromochlinae: Gelanoglanini, Gephyromochlini, Centromochlini, and Glanidini. Additionally, most of auchenipterid genera were recovered as monophyletic, except for Centromochlus and Tatia. Centromochlus is restricted to only three species while Tatia is recovered as the most specious centromochline genus including the currently Centromochlus simplex, C. reticulatus and Pseudotatia parva, herein reallocated. To address the paraphyly of Centromochlus and Tatia, two new genera of Centromochlinae were proposed and a nomenclatural reorganization of the species in these genera was conducted. Furthermore, Glanidium and Trachycorystes resulted as paraphyletic, and a new combination for Glanidium leopardum, resurrecting Gephyromochlus, to allocate this taxa and a new genus of Auchenipterinae to allocate Trachycorystes menezesi were proposed. Notwithstanding, Ageneiosus was recovered as paraphyletic since Ageneiosus militaris was recovered as sister group to Ageneiosus and Tympanopleura. The paraphyly of Ageneiosus seems to be an artifact of morphological missing data for A. militaris and until these data are included in the analysis to readily test the position of this species, both genera are maintained as valid. A synapomorphy list and the diagnosis for each clade are presented under a new classification proposal. Furthermore, the interrelationship and monophyly of the genera and major groups are discussed and compared to previous propositions.
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Taxonomic revision of Neoplecostomus franciscoensis (Langeani 1990)

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PDF Source : http://repositorio.unesp.br/bitstream/h ... sAllowed=y

Title : Revisão Taxonômica de Neoplecostomus franciscoensis Langeani, 1990 (Loricariidae: Neoplecostominae)
Author : Arieli Matheus Cherobim,
Scholar : Universidade EstaDual Paulista "Julio de Mesquita Filho", Instituto de Biociencias, Campus de Sao José do Rio Preto, 23/03/2016

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PS : Graphs, table, Taxonomy, etc...in Annexe, page 57 to 62

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Cytogenetic and dna content in 6 genera of the family callichthyidae (pisces, siluriformes)

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Title : CYTOGENETIC AND DNA CONTENT IN 6 GENERA OF THE FAMILY CALLICHTHYIDAE (PISCES, SILURIFORMES)

Source : http://repositorio.unesp.br/handle/11449/37716

PDF Source : https://www.researchgate.net/profile/Cl ... ef76a6.pdf

Author
Oliveira, C.
Almeidatoledo, L. F.
Mori, L.
Toledo, S. A.

Date : 1993-04-01

Abstract
Cytogenetic studies involving conventional Giemsa staining, C-banding analysis and silver staining of NORs were performed on nine species belonging to six genera of the family Callichthyidae. The diploid number ranged from 2n = 44 to 2n = 100, the number of chromosomal pairs with NORs ranged from 1 to 4 and constitutive heterochromatin was mainly distributed in the centromeric and/or pericentromeric position of the chromosomes. The DNA content of erythrocytes from six species studied ranged from 1.18 +/- 0.07 to 2.77 +/- 0.22 pg/nucleus. The extensive variability in karyotypes and in nuclear DNA content detected are in accordance with the initial hypothesis that chromosome rearrangements and polyploidy have played a significant role in the evolutionary history of Callichthyidae
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The Dissertations Sticky

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Just a reminder to append (i.e. reply) to this thread with any dissertations as opposed to having them all as their own topics in this section of the forum.

Thanks!

Jools

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PhD Dissertation: Investigating mechanisms of genome expansion in Corydoradinae catfish

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Marburger, Sarah. 2015. Investigating mechanisms of genome expansion in Corydoradinae catfish. Ph.D. Dissertation, Prifysgol Bangor University
Sarah Marburger wrote:ABSTRACT:
The Corydoradinae catfish are a diverse sub-family of neo-tropical catfishes (order Siluriformes) with more than 170 species described to date. One of the most compelling features of this sub-family is the enormous amount of variation in genome size. With species containing between 0.5 pg and 4.8pg of DNA, variation is comparable to that found across the Teleostei as a whole. Previous phylogenetic analysis identified nine distinct lineages within the Corydoradinae, with more basal lineages possessing smaller genomes and with largest genome sizes found in the most derived lineages. To date, nothing is known about the mechanism that drove this genome expansion in the Corydoradinae, though Whole Genome Duplication (WGD) events have been suggested. Here, the incidence of WGD events has been investigated using a Hox gene and a restriction site associated DNA (RAD) sequencing data set. Both data sets identified a major duplication event at the base of the group, with additional duplication events occurring across the family. These duplication events were shown to have led to relaxed purifying selection and increased functional divergence of HoxA13a copies in the Corydoradinae compared with teleosts that have not undergone additional rounds of WGD. The RAD data set confirmed significant genome-wide shifts in duplicate, multi-haplotype regions across the Corydoradinae, and indicates that several species from lineages 6-9 are functionally polyploid, whereas species that underwent earlier WGDs have largely diploidized and are likely paleopolyploids. An increase in paralogous genes was noted, with Gene Ontology suggesting that gene retention in the Corydoradinae mirrors previously described retention in Tetraodon following the fish-specific genome duplication in the Teleostei. Intriguingly, the RAD data also identified a significant expansion of Transposable Elements (TEs), driven by a DNA TE superfamily (Tc1-Mariner). This expansion significantly contributed to the genome size variation, though to a lesser degree than the WGD events identified within this thesis.
P.S., @admin, FYI it seems that the Dissertations "sticky" has become "unstuck." I had a difficult time finding this thread because it no longer stays near the top (sticky) of the Taxonomy & Science News forum. Cheers, Eric
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Re: The Dissertations Sticky

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This topic has had glue freshly re-applied. Seems the sticky option can have a time limit applied after which its "adhesion" is removed.

Jools

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Re: The Dissertations Sticky

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:-BD Thanks Jools. Well, isn't that an annoying characteristic! :))

Cheers, Eric
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Comparison of the diets of three Loricariids from the upper Jacuí basin

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Langoni, Andrei da Silveira. 2015. Biologia comparada alimentar de três lolicarídeos (OSTARIOPHYSI, SILURIFORMES) em diferentes riachos da Bacia do Alto Jacuí, Rio Grande do Sul, Brasil. PhD Dissertation, Universidade Federal do Rio Grande do Sul. Instituto de Biociências. Programa de Pós-Graduação em Biologia Animal.
Repository link: http://www.lume.ufrgs.br/handle/10183/131920
Full text (PDF): http://www.lume.ufrgs.br/bitstream/hand ... sequence=1
Langoni wrote:ABSTRACT
Study comparing the diet of three species of loricariids Eurycheilichthys limulus, Ancistrus brevipinnis, and Hemiancistrus punctulatus in different streams aiming to verify the presence or absence of food overlap between the species and between each species of size. Samples were conducted bimonthly by electrofishing technique from June / 2012 to June / 2013 In streams of high Jacuí basin, Rio Grande do Sul, Brazil. Through the content analysis feeds were identified 26 food items. In general, the three species showed the presence of four items that stood out: Detritus Organic, Bacillariophyta, Sediment, and Plant Material. In addition to these items, other items were representatively consumed differently for each species. The species Eurycheilichthys limulus consumed a high proportion of Simuliidae larvae and Chironomidae larvae, the species A. punctulatus and H. brevipinnis had a similar composition of the diet, Ancistrus brevipinnis presented as the main food items consumed: algae Oedogoniophyceae, larvae Chironomidae, Tecameba, algae Zygnemaphyceae, and Rotifers, while Hemiancistrus punctulatus presented as the main food items consumed algae Oedogoniophyceae, algae Zygnemaphyceae, Tecameba, larvae Chironomidae, and algae Cyanophycea. Species segregation can be observed by Analysis Coordinates Principal (PCoA). The items identified were responsible for this difference. All species and all size classes showed a high value of niche breadth. In general, these species have a low feeding overlap values. Some interactions between the species Eurycheilichthys limulus versus Hemiancistrus punctulatus and between Ancistrus brevipinnis versus Hemiancistrus punctulatus showed the presence of high values of food overlap indicating a competition, but the null model confirmed the niche partitioning between the species and classes size / species. Finally, it was found that there are food segregation between the three species of Siluriformes studied and that the sharing of resources between species is related to differential use of items in different stages of life.

RESUMO
Estudo comparando a dieta de três espécies de loricarídeos Eurycheilichthys limulus, Ancistrus brevipinnis e Hemiancistrus punctulatus, em diferentes riachos, com os objetivos de verificar a ocorrência ou não de sobreposição alimentar entre as espécies e entre as classe de tamanho de cada espécie. As coletas foram realizadas bimestralmente, pela técnica de pesca elétrica, a partir de junho / 2012 a junho / 2013, em riachos da bacia do alto Jacuí, Rio Grande do Sul, Brasil. Por meio da análise do conteúdo alimentar, foram identificados 26 itens alimentares. De modo geral, as três espécies apresentaram quatro itens que se destacaram: Detrito orgânico, Bacillariophyta, Sedimento e Material vegetal. Além disso, a espécie Eurycheilichthys limulus consumiu uma elevada proporção de larvas de Simuliidae e Chironomidae, e as espécies Ancistrus brevipinnis e Hemiancistrus punctulatus apresentaram uma composição da dieta semelhante. Ancistrus brevipinnis apresentou como principais itens alimentares consumidos alga Oedogoniophyceae, larva de Chironomidae, Tecameba, alga Zygnemaphyceae e Rotífera, enquanto Hemiancistrus punctulatus apresentou como principais itens alimentares consumidos alga Oedogoniophyceae, alga Zygnemaphyceae, Tecameba, larva de Chironomidae e alga Cyanophyceae. Foram identificados os itens responsáveis por essa diferença. Todas as espécies e classes de tamanho apresentaram um alto valor de amplitude de nicho e, na maioria das interações, um baixo valor de sobreposição alimentar. Algumas interações entre as espécies Eurycheilichthys limulus versus Hemiancistrus punctulatus e Ancistrus brevipinnis versus H. punctulatus apresentaram valores altos de sobreposição alimentar, o que poderia indicar uma competição, porém o modelo nulo mostrou o compartilhamento de recursos entre as espécies e classes de tamanho/espécies. Por fim, constatou-se que há segregação alimentar entre as três espécies de Siluriformes estudadas e que a partilha de recursos entre as espécies está relacionada à utilização diferencial de itens em diferentes fases da vida.
Red text = typographical error where specific epithets for Ancistrus and Hemiancistrus are reversed.

Besides its research value, this paper has nice photos of the habitats of these fish, and photos of the fish.
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PhD Dissertation: Phylogeny of the family Aspredinidae and taxonomic revision of Bunocephalinae

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Cardoso, Alexandre Rodrigues. 2008. Filogenia da família Aspredinidae adams, 1854 e revisão taxonômica de Bunocephalinae Eigenmann & Eigenmann, 1888 (teleostei: siluriformes: aspredinidae). PhD dissertation, Pontifícia Universidade Católica do Rio Grande do Sul. Programa de Pós-Graduação em Biociências – Zoologia.

Reference: http://meriva.pucrs.br/dspace/handle/10923/5354; complete PDF HERE.
Cardoso wrote:ABSTRACT
With base on the analysis morphological of 153 characteres and 53 taxa of Aspredinidae are proposed the following results: a) Acanthobunocephalus and Bunocephalus as monophyletic groups and their interrelations resolved b) eight new species of aspredinids, being that five of them already mentioned by Friel (Acanthobunocephalus sp. nov. 1., Acanthobunocephalus sp. nov. 2., Acanthobunocephalus “l” sp. nov., Amaralia sp. nov. and Ernstichthys sp. nov. ) and three discoveries during the development of this study (Acanthobunocephalus sp. nov. 3., Acanthobunocephalus sp. nov. 4 and Bunocephalus sp. nov. ); c) reallocation of some species of Bunocephalus (B. amazonicus, B. bifidus, B. iheringii, B. quadriradiatus, B. rugosus) in Acanthobunocephalus; d) Bunocephalus aloikae as a species valid and not as synonym of Bunocephalus amaurus; e) key for species from Acanthobunocephalus and Bunocephalus; f) a new classification for Aspredinidae; and g) the corroboration of the hypothesis that Aspredinidae is sister to the Asian Sisoroidea (Amblycipitidae, Akysidae, Sisoridae, and Erethistidae) as proposed by de Pinna, Britto and Diogo Vandewalle & Chardon, and not to the Doradoidea, as suggested by Friel and Sullivan, Lundberg & Hardman.

RESUMO
Com base na análise morfológica de 153 caracteres de 53 táxons de Aspredinidae são propostos os seguintes resultados: a) Acanthobunocephalus e Bunocephalus como grupos monofiléticos e com suas inter-relações resolvidas; b) oito espécies novas de aspredinídeos, sendo que cinco delas já mencionadas por Friel (Acanthobunocephalus sp. nov. 1., Acanthobunocephalus sp. nov. 2., Acanthobunocephalus “l” sp. nov., Amaralia sp. nov. e Ernstichthys sp. nov. ) e três descobertas durante o desenvolvimento deste estudo (Acanthobunocephalus sp. nov. 3., Acanthobunocephalus sp. nov. 4 e Bunocephalus sp. nov. ); c) transferência de algumas espécies de Bunocephalus (B. amazonicus, B. bifidus, B. iheringii, B. quadriradiatus e B. rugosus) para Acanthobunocephalus; d) Bunocephalus aloikae como uma espécie válida e não como sinônimo de Bunocephalus amaurus; e) chave para as espécies de Acanthobunocephalus e Bunocephalus; e) uma nova classificação para Aspredinidae; e f) corroboração da hipótese de que Aspredinidae é grupo irmão do clado asiático Sisoroidea (Amblycipitidae, Akysidae, Sisoridae e Erethistidae), como proposto por de Pinna, Britto e Diogo, Vandewalle & Chardon, e não de Doradoidea como sugerido por Friel e Sullivan, Lundberg & Hardman.
This is dated and some conclusions were never validated (e.g., transferring Pseudobunocephalus and one species of Bunocephalus to Acanthobunocephalus), but it has photos of some Bunocephalus not otherwise easily found.

Also, the keys for these fish were extracted and posted here: Cardoso's (2008) key to the genera Bunocephalus, Pseudobunocephalus, and Acanthobunocephalus.
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M.S. Thesis: Trophic dynamics of flathead catfish in the Missouri River

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Turner, D.R. (2017). "Trophic dynamics of flathead catfish in the Missouri River bordering Nebraska." M.S. Thesis, University of Nebraska, 2017. Dissertations & Theses in Natural Resources. 156.

http://digitalcommons.unl.edu/natresdiss/156
Pdf: http://digitalcommons.unl.edu/cgi/viewc ... natresdiss
"D. R. Turner" wrote:ABSTRACT

Understanding the trophic dynamics of large, riverine ecosystems is complex and requires knowledge from several inputs and outputs of the ecosystem. Most riverine ecosystems have been altered in some way whether through damming, channelizing, or diverting water. The Missouri River is not immune to these anthropogenic alterations. The river has dams throughout its middle portion and is channelized from Sioux City, Iowa to its confluence with the Mississippi River. Flathead Catfish pylodictus olivarius [sic] are one of the most ecologically harmful introduced species but little research has looked at the influence native populations of Flathead Catfish have on native prey populations where river modification has occurred. I collected Flathead Catfish diet samples and analyzed potential and realized prey caloric content to answer questions on how this abundant, apex predator influences prey populations within their native range. Flathead Catfish had similar diets among three distinct seasons (spring, summer, fall), selected for three fish species (Common Carp, Flathead Catfish, and Shovelnose Sturgeon) and two macroinvertebrate taxa (Ephemeroptera and Plecoptera), and consumed prey resources in similar quantities to introduced populations. The caloric values for prey items varied but selected species did not have highest nor lowest values. Using our diet indices and consumption rates, I estimated that Flathead Catfish consumed on average 175.3 ± 2.1 kcals (dry weight) per individual per day, equivalent to around 220.9 kg of biomass consumed by the entire sample population daily. This research will help researchers better understand the trophic dynamics within the Missouri River ecosystem.
Keyword: Pylodictis olivaris
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Ph.D. Dissertation: Chromosomal analyzes of three species of Farlowella

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Silva, L.M.D. (2017). "Análises cromossômicas, clássica e molecular, de três espécies de Farlowella Eigenmann & Eigenmann, 1889 (Siluriformes, Loricariidae, Loricariinae)." [75 f.]. Dissertação (Genética, Conservação e Biologia Evolutiva (GCBEv)) - Instituto Nacional de Pesquisas da Amazônia, Manaus.

Silva, L.M.D. (2017). "Classical and molecular chromosomal analyzes of three species of Farlowella Eigenmann & Eigenmann, 1889 (Siluriformes, Loricariidae, Loricariinae)." [75 f.]. Dissertation (Genetics, Conservation and Evolutionary Biology (GCBEv)) - National Research Institute of the Amazon, Manaus.

http://bdtd.inpa.gov.br/handle/tede/2332
"Silva" wrote:RESUMO:

O gênero Farlowella é conhecido como bagre-vara ou peixe-galho, de distribuição restrita aos rios da América do Sul, tendo, na bacia amazônica, grupos de espécies endêmicas. Este gênero é caracterizado por apresentar: corpo coberto por placas ósseas, pedúnculo caudal longo e deprimido, focinho proeminente e ausência de nadadeira adiposa e por causa de sua morfologia peculiar são apreciados como peixes ornamentais. Entretanto, a sistemática de Farlowella permanece confusa e controversa, e tem passado por diferentes agrupamentos ao longo de sua história. Assim, o presente estudo objetivou analisar, por meio da citogenética clássica e molecular, três espécies de Farlowella que ocorrem na bacia do rio Negro, a fim de encontrar possíveis marcadores espécie-específicos ou populacionais, que permitam inferir sobre os mecanismos de sua evolução cromossômica. Foram analisados 28 indivíduos de três espécies de Farlowella de diferentes localidades: F. cf. amazona proveniente das adjacências da cidade de Barcelos-AM, F. oxyrryncha do Igarapé do Sítio Agenor e F. schreitmuelleri do Igarapé Jundiá, ambos localizados no Município de Manaus-AM. As três espécies apresentaram 2n=58 cromossomos e número fundamental 110, 112 e 116 braços, respectivamente. Quanto à heterocromatina constitutiva, as três espécies exibiram blocos na região centromérica, bem como algumas arcações biteloméricas e somente F. oxyrryncha e F. schreitmuelleri apresentaram marcações intersticiais. Ainda, o padrão de banda C observado no par 27 de F. oxyrryncha caracteriza um sistema de cromossomos sexuais do tipo XX/XY. O par cromossômico nucleolar parece ser homeólogo entre as espécies. A sonda de DNAr 5S foi um marcador espécie-específico. A FISH com sonda telomérica detectou sequências teloméricas intersticiais (ITS) em F. oxyrryncha e em F. schreitmuelleri e estas foram coincidentes com heterocromatina. Em F. oxyrryncha a ITS foi polimórfica, sendo observadas quatro variações. A partir dos dados obtidos foi possível sugerir que os rearranjos cromossômicos, envolvidos na evolução cariotípica desse gênero e na diferenciação de cromossomos sexuais são não Robertsonianos e que as diferenças interespecíficas e populacionais podem sugerir a presença de complexos de espécies nesse gênero.
"Silva" wrote:ABSTRACT

The genus Farlowella is known as catfish or branchfish, of distribution restricted to the rivers of South America, having, in the Amazon basin, groups of endemic species. This genus is characterized by presenting: body covered by bony plates, long and depressed caudal peduncle; prominent snout and absence of adipose fin and because of their peculiar morphology are sold as ornamental fish. However, Farlowella's systematics remains confused and controversial, and has gone through different groupings throughout its history. Thus, the present study aimed to characterize, through classical and molecular cytogenetic analyzes, three Farlowella species that occur in Negro River basin, in order to find possible species-specific markers or population-based markers that allow inferring on the mechanisms of its chromosome evolution. We analyzed 28 individuals of three Farlowella species from different localities: F. cf. amazona from the vicinity of the city of Barcelos-AM, F. oxyrryncha of the Igarapé of Agenor Site and F. schreitmuelleri of Igarapé Jundiá, both located in the Municipality of Manaus-AM. The three species presented 2n = 58 chromosomes and fundamental number 110, 112 and 116 arms. As for constitutive heterochromatin, the three species exhibited blocks in centromeric region and adjacencies, as well as some bitelomeric markers and only F. oxyrryncha and F. schreitmuelleri showed interstitial markings. Furthermore, the C-band pattern observed in pair 27 of F. oxyrryncha appears to characterize a sex chromosome system of type XX/XY. The nucleolar chromosomal pair appears to be homeologous between species. The 5S rDNA probe was a species-specific marker. FISH with telomeric probe detected interstitial telomeric sequences (ITS) in F. oxyrryncha and F. schreitmuelleri and these were matched with heterochromatin. In F. oxyrryncha ITSs was polymorphic, with four variations observed. From the data obtained it was possible to suggest that the chromosomal rearrangements involved in the karyotype evolution of this genus and in the differentiation of sex chromosomes are non Robertsonian rearrangements, and that interspecific and population differences may suggest the presence of species complexes in this genus.
Species analyzed:
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Ph.D. Dissertation: Systematics of Neoplecostomus

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Andrade, Breno Neves de. 2017. Systematics of Neoplecostomus Eigenmann & Eigenmann, 1888 (Siluriformes: Loricariidae: Neoplecostominae). Ph.D. Thesis, São Paulo State University, S. J. Rio Preto Campus, Brazil.

Andrade, Breno Neves de. 2017. Sistemática de Neoplecostomus Eigenmann & Eigenmann, 1888 (Siluriformes: Loricariidae: Neoplecostominae). Ph.D. Tese, Universidade Estadual Paulista "Júlio de Mesquita Filho", Campus de São José do Rio Preto, Brazil.

LINK: https://repositorio.unesp.br/handle/114 ... ?show=full
Partial PDF: Here
Full (maybe) PDF (link didn't work for me): Here

ABSTRACT

Neoplecostomus currently includes sixteen valid species, with nine of those described in the last nine years. The genus is distributed at Paraná, Doce, São Francisco, Paraíba do Sul, Ribeira de Iguape, Iguaçu river basins, and other coastal and independent basins in southern and southeastern of Brazil. Moreover, there are evidences of new species for most of these basins and others basins where the genus has not been registered yet. According to the phylogenetic relationships proposed for Neoplecostominae sensu Pereira (2008) and based on morphological data, Neoplecostomus is monophyletic, contrary to the hypothesis based on molecular data, which indicates a non-monophyletic Neoplecostomus. In this context, the aims of the present study were: (1) to perform a phylogenetic analysis and a taxonomic revision of Neoplecostomus genus; (2) to evaluate the specific composition and the monophyly of the genus; and (3) to evaluate the phylogenetic relationship within the genus and among the genus and other Neoplecostominae genera. Phylogenetic analysis was performed with 273 characters from 62 terminal taxa, including species from Astroblepidae, Delturinae, Loricariinae, Hypostominae, Hypoptopomatinae and Neoplecostominae. The analysis produced only one more parsimonious tree that corroborated Neoplecostominae monophyly. Neoplecostominae is composed only by ((Pareiorhina hyptiorhachis + (Pareiorhina carrancas + (Pareiorhina pelicicei + (Pareiorhina rosai + Pareiorhina brachyrhyncha)))) + (Pareiorhina rudolphi + (Pareiorhaphis + (Isbrueckerichthys + Neoplecostomus)))))). Supported by 34 synapomorphies, Neoplecostomus was also monophyletic in our analysis. The genus showed seven exclusive synapomorphies: a (1) ventral dense plate shield surpassing the transverse line that passes through the base of the pelvic-fin insertions; (2) absence of smaller platelets between a dense plate shield and pectoral-fin insertions; (3) pectoral-fin spine distinctly curved and forming a wide and conspicuous arch; (4) distal portion of the lateropterygium distinctly spatulate; (5) conspicuous rows of enlarged and transversely flattened papillae just posterior to the dentary teeth; (6) two conspicuous rows of enlarged and transversely flattened papillae just posterior to the dentary teeth and (7) conspicuous rows of enlarged and transversely flattened papillae just posterior to the dentary teeth, with rounded format. Additionally, the intra-relationships among Neoplecostomus species were: N. bandeirante + (((N. langeanii + N. jaguari) + ((N. corumba + N. paranensis) + (N. botucatu + (N. yapo + N. selenae)))) + ((N. sp. n. Iguaçu + N. sp. n. Delfim) + (N. sp. n. Piquiri + (N. doceensis + (N. sp. n. Doce + (N. sp. n. São Francisco + N. sp. n. Araguari))))) + (N. ribeirensis + (N. sp. n. Itapemirim + ((N. franciscoensis + N. espiritosantensis) + (N. microps + (N. paraty + N. granosus)))))). As a result of the taxonomic revision, we presented a redescription of the genus and of fifteen of the sixteen valid species, with emphasis on the rediscovery of Neoplecostomus granosus and the possible type locality, one species that for several years has been identified as a synonymous of N. microps. Furthermore, seven new species were proposed for the genus and Neoplecostomus variipictus was synonymized with N. microps.
  • Keywords: Phylogeny, Taxonomy, Shells, Morphology, Brazilian Crystalline Shield,
    Fresh water.
RESUMO

Neoplecostomus é composto atualmente por dezesseis espécies válidas, com nove dessas espécies descritas nos últimos nove anos. O gênero distribui-se pelas bacias dos rios: Paraná, Doce, São Francisco, Paraíba do Sul, Ribeira de Iguape, Iguaçu e outras bacias litorâneas e independentes do sul e sudeste brasileiro, com indícios de espécies novas para a maioria dessas bacias e outras bacias ainda não registradas. De acordo com as relações filogenéticas propostas para Neoplecostominae, por Pereira (2008), com dados morfológicos, Neoplecostomus é monofilético, divergindo das hipóteses baseadas em dados moleculares mais recentes, que aponta Neoplecostomus não monofilético. Desse modo, os objetivos do presente estudo foram: (1) realizar uma análise filogenética e revisar taxonomicamente Neoplecostomus; (2) avaliar a composição e monofiletismo do gênero e, (3) avaliar as relações filogenéticas de suas espécies e delas com os demais Neoplecostominae. A análise filogenética foi realizada com base em 273 caracteres, investigados em 62 táxons terminais, com membros pertencentes à Astroblepidae, Delturinae, Loricariinae, Hypostominae, Hypoptopomatinae e Neoplecostominae. Os resultados obtidos, a partir de uma única árvore mais parcimoniosa, corroboram Neoplecostominae monofilético, formado apenas por ((Pareiorhina hyptiorhachis + (Pareiorhina carrancas + (Pareiorhina pelicicei + (Pareiorhina rosai + Pareiorhina brachyrhyncha)))) + (Pareiorhina rudolphi + (Pareiorhaphis + (Isbrueckerichthys + Neoplecostomus)))))). Neoplecostomus também resulta monofilético em nossa análise, suportado por 34 sinapomorfias, sendo sete sinapomorfias exclusivas: (1) escudo ventral, pentagonal ou hexagonal, formado por pequenas placas, ultrapassando a linha transversal que passa pela base do raio indiviso da nadadeira pélvica; (2) placas menores entre o escudo ventral de placas (pentagonal ou hexagonal) e a inserção do raio indiviso da nadadeira peitoral ausentes; (3) perfil dorsal do raio não ramificado da nadadeira peitoral com curvatura acentuada; (4) porção distal do lateropterígio claramente espatulado; (5) papilas conspícuas posteriores ao dentário presentes; (6) duas fileiras de papilas conspícuas posterior ao dentário e, (7) papilas conspícuas após os dentes do dentário arredondadas. Adicionalmente, a seguinte intra-relação de Neoplecostomus foi encontrada: N. bandeirante + (((N. langeanii + N. jaguari) + ((N. corumba + N. paranensis) + (N. botucatu + (N. yapo + N. selenae)))) + ((N. sp. n. Iguaçu + N. sp. n. Delfim) + (N. sp. n. Piquiri + (N. doceensis + (N. sp. n. Doce + (N. sp. n. São Francisco + N. sp. n. Araguari))))) + (N. ribeirensis + (N. sp. n. Itapemirim + ((N. franciscoensis + N. espiritosantensis) + (N. microps + (N. paraty + N. granosus)))))). Apresenta-se também o resultado da revisão taxonômica, com a redescrição do gênero e de quinze das dezesseis espécies válidas, com destaque para redescoberta de Neoplecostomus granosus e sua possível localidade tipo, espécie que há vários anos acreditava-se ser sinônimo de Neoplecostomus microps. Ainda, sete espécies novas são propostas para o gênero e Neoplecostomus variipictus é sinonimizado com N. microps.
  • Palavras-chave: Filogenia, Taxonomia, Cascudos, Morfologia, Escudo Cristalino Brasileiro,
    Água doce.
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Ph.D. Dissertation: The phylogeny of the family Callichthyidae

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This is an older dissertation, but it should have been listed here when it was released:

Vera-Alcaraz, H.S. 2013. Phylogenetic systematics of armored catfishes of the family Callichthyidae (Siluriformes, Loricariodea). Ph.D. Thesis, Pontifícia Universidade Católica Do Rio Grande Do Sul, Brazil.

Vera-Alcaraz, H.S. 2013. Relações filogenéticas das espécies da família Callichthyidae (Ostariophysi, Siluriformes). Ph.D. Tese, Pontifícia Universidade Católica Do Rio Grande Do Sul, Brazil.
H.S. Vera-Alcaraz wrote:ABSTRACT

The phylogeny of the family Callichthyidae (Siluriformes) was investigated performing a Cladistic parsimony analysis under a Total Evidence approach. Characters explored are mainly based in osteology and molecular data of nuclear and mitochondrial genes. The ingroup included 131 terminals representing 111 species, the outgroup included 13 terminals representing 13 species including Copionodon as the rooting taxa. The phylogenetic analysis resulted in 89 most parsimonious trees which are summarized in a strict consensus cladogram; a new phylogenetic classification and the discussion of this paper are addressed based in this topology. The Total Evidence phylogenetic analysis corroborated the monophyly of the family Callichthyidae, subfamilies Callichthyinae and Corydoradinae, genera Callichthys, Dianema, Lepthoplosternum, Megalechis, and Scleromystax. However, the genera Aspidoras, Corydoras, and Hoplosternum are recovered nonmonophyletic. To reconcile this situation, a revalidation of the genera Hoplisoma and Gastrodermus is proposed to accommodate most species currently recognized in Corydoras. Aspidoras virgulatus and Corydoras lacerdai are transferred to Scleromystax to conceive their currently containing genera monophyletic. On the other hand, Hoplosternum is recovered paraphyletic. However, it was decided to hold making taxonomic changes at this moment until molecular dataset is completed for this genus, which is referred temporarily as “Hoplosternum”. Synapomorphies for each clade recovered and ranked in the phylogenetic classification are reported here, emphasizing their morphological diagnoses. Interrelationships between species and clades are discussed and compared with previous taxonomic and phylogenetic hypotheses. In addition, the taxonomy of Hoplisoma nattereri was reviewed in order to elucidate its synonymy and investigate the presence of cryptic diversity under this name. Hoplisoma nattereri and H. triseriatus are considered valid species. Geographic distribution for each species is also reported. Corydoras juquiaae is removed from the synonymy of Hoplisoma nattereri and transferred to Scleromystax juquiaae, new combination. Scleromystax prionotos is considered a junior synonym of S. juquiaae. All these species are illustrated in this paper. In addition, the original figure of S. juquiaae prepared but never published by Rudolph von Ihering is reproduced here. Phylogenetic relationships of Hoplisoma nattereri and H. triseriatus are discussed and also the morphometric and genetic distance of some of the populations sampled.
H.S. Vera-Alcaraz wrote:RESUMO

A filogenia da família Callichthyidae (Siluriformes) foi estudada realizando uma análise de Parcimônia Cladística sob uma abordagem de Evidência Total. Caracteres explorados foram principalmente baseados em osteologia e dados moleculares de genes nucleares e mitocondriais. O grupo interno incluiu 131 terminais representando 111 espécies; o grupo externo incluiu 13 terminais representando 13 espécies e incluindo Copionodon como o terminal de enraizamento da topologia. A análise filogenética resultou em 89 árvores mais parcimoniosas que foram resumidas em um cladograma de consenso estrito; com base nessa topologia, se propõe e discute uma nova classificação filogenética para Callichthyidae. A análise filogenética de Evidência Total corroborou o monofiletismo da família Callichthyidae, subfamílias Callichthyinae e Corydoradinae, gêneros Callichthys, Dianema, Lepthoplosternum, Megalechis e Scleromystax. No entanto, os gêneros Aspidoras, Corydoras e Hoplosternum foram recuperados nãomonofiléticos. Para conciliar esta situação, se propõe a revalidação dos gêneros Hoplisoma e Gastrodermus para acomodar a maioria das espécies atualmente reconhecidas em Corydoras. Aspidoras virgulatus e Corydoras lacerdai foram transferidas para Scleromystax e assim conceber esses gêneros como monofiléticos. Por outro lado, as espécies de Hoplosternum foram recuperadas como parafiléticas. No entanto, decidiu-se não fazer mudanças taxonômicas no momento até concluir a coleta de dados moleculares para este grupo, o qual é reconhecido temporariamente como “Hoplosternum”. Sinapomorfias para cada clado recuperado e proposto na classificação filogenética são aqui mostrados, enfatizando seus caracteres morfológicos diagnósticos. Inter-relações entre as espécies e clados são discutidas e comparadas com estudos taxonômicos e hipóteses filogenéticas anteriores. Adicionalmente, a taxonomia de Hoplisoma nattereri foi revisada a fim de elucidar sua sinonímia e investigar a presença de diversidade críptica sob este nome. Hoplisoma nattereri e H. triseriatus são consideradas espécies válidas. A distribuição geográfica para cada espécie é reportada. Corydoras juquiaae é removida da sinonímia de Hoplisoma nattereri e transferida para Scleromystax juquiaae, nova combinação. Scleromystax prionotos é considerada um sinônimo júnior de S. juquiaae. Todas estas espécies são ilustradas neste artigo. Também, a figura original de Corydoras juquiaae preparada, mas nunca publicada, por Rudolph von Ihering é aqui reproduzida. As relações filogenéticas de Hoplisoma nattereri e H. triseriatus foram discutidas como assim a sua morfometría e a distância genética de algumas das populações amostradas.
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Ph.D.Dissertation: Phylogenetic systematics and chromosome evolution in Amazonian Aspredinidae

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Santos, M. F. D. (2017). Phylogenetic systematics and chromosome evolution in Amazonian species of Aspredinidae (Ostariophysi, Siluriformes). Ph.D. Thesis (Genetics, Conservation and Evolutionary Biology (GCBEv)) - National Research Institute of the Amazon, Manaus.

Santos, M. F. D. (2017). Sistemática filogenética e evolução cromossômica em espécies amazônicas de Aspredinidae (Ostariophysi, Siluriformes). Ph.D. Tese (Genética, Conservação e Biologia Evolutiva (GCBEv)) - Instituto Nacional de Pesquisas da Amazônia, Manaus.

Link: http://bdtd.inpa.gov.br/handle/tede/2451
Santos wrote:ABSTRACT
The Aspredinidae family, order Siluriformes, is a group of Neotropical fishes, popularly known as “banjo catfishes” or “rabeca”. It is strictly distributed in South America, and within the Amazon River basin, there are endemic species groups. In the present study, cytogenetic and molecular analysis were performed with species of this family, aiming at understanding the evolutionary processes involved in the diversification of these small catfishes, in order to infer their taxonomic status. Some inedited chromosomal characterizations were presented, of the species Amaralia hypsiura, Bunocephalus cf. aloikae, B. amaurus, B. coracoideus, B. aff coracoideus, B. verrucosus and Platystacus cotylephorus. The chromosomal data, with the 5S rDNA mapping and the constitutive heterochromatin distribution, revealed a new sex chromosomes system of the X 1 X 1 X 2 X 2 /X 1 Y 1 X 2 Y 2 type in a B. coracoideus population. The karyotype characterization of P. cotylephorus revealed a second event of XX/XO sex system for Siluriformes. The analysis of a phylogram with four Bunocephalus coracoideus populations, based on one mitogenome region, revealed some clades with genetic diversity, suggesting the existence of well supported Evolutionary Significant Units, building a species complex, under allopatric and sympatric speciation processes. Yet, the chromosomal data allowed noticing a trend on the reduction of the diploid number during the chromosomal evolution of the family, in relation to the ancestral karyotype of the Siluriformes, although keeping a karyotype with most of the chromosomes being two-armed ones. Later on, by means of chromosomal rearrangements of the type pericentric inversions and fission, the diploid number of some species increased and the karyotype morphology changed to single-armed chromosomes, a synapomorphy for the family. The karyotype diversity, both on the diploid number and the chromosome morphology in Aspredinidae, it very similar to the ones found in families from the Asiatic clade Sisoroidea (Amblycipitidae, Akysidae, Sisoridae and Erethistidae), suggesting that these families went under the different selective pressures for the karyotype building or a common natural history. Thus, it corroborates the propositions of Aspredinidae and Sisoroidea as sister-groups, suggested by Ferraris (1989), de Pinna (1998), Britto (2002), Diogo et al. (2004) and Cardoso (2000).
  • Key words: Banjo fish, Chromosomes
Santos wrote:RESUMO
A família Aspredinidae, ordem Siluriformes, é composta por um grupo de peixes neotropicais, popularmente conhecidos como bagres banjo ou rabeca. Possui distribuição restrita à América do Sul, tendo na bacia amazônica, importantes grupos de espécies endêmicas. No presente trabalho, foram realizadas análises citogenéticas e moleculares em espécies desta família, com objetivo de compreender os processos evolutivos envolvidos na diversificação destes pequenos bagres, a fim de inferir no status taxonômico. Foram disponibilizadas caracterizações cromossômicas inéditas de Amaralia hypsiura, Bunocephalus cf. aloikae, B. amaurus, B. coracoideus, B. aff coracoideus, B. verrucosus e Platystacus cotylephorus. Os dados cromossômicos, com mapeamento de DNAr 5S e distribuição da heterocromatina constitutiva revelaram um sistema de cromossomos sexuais inédito do tipo X 1 X 1 X 2 X 2 /X 1 Y 1 X 2 Y 2 em uma população de B. coracoideus. E caracterização cariotípica de P. cotylephorus revelou um segundo caso em Siluriformes de sistema sexual XX/XO. A análise de um filograma com quatro populações de Bunocephalus coracoideus, com base em uma região do mitogenoma, revelou clados com diversidade genética, que corroboraram os dados de distribuição geográfica e variação cariotípica, sugerindo a existência de Unidades Evolutivas Significativas bem suportadas, formando um complexo de espécies, em processo de especiação alopátrica e simpátrica. Ainda, os dados cromossômicos permitiram a percepção de uma tendência à redução do número diploide na evolução cromossômica da família em relação ao cariótipo ancestral dos Siluriformes, conservando um cariótipo com maioria de cromossomos de dois braços. E, posteriormente, por rearranjos cromossômicos do tipo inversões pericêntricas e fissões, o número diploide de algumas espécies teria aumentado e a morfologia cariotípica se modificado para cromossomos de um braço, sendo este uma sinapomorfia na família. A
diversidade cariotípica, tanto no número diploide como na morfologia dos cromossomos em Aspredinidae é muito parecida às encontradas nas famílias do clado asiático Sisoroidea (Amblycipitidae, Akysidae, Sisoridae e Erethistidae), sugerindo que essas famílias sofreram as diferentes pressões seletivas para formação dos cariótipos ou uma história natural em comum. Assim, corroborando com a proposta de Aspredinidae e Sisoroidea serem grupos-irmãos, sugerida por Ferraris (1989), de Pinna (1998), Britto (2002), Diogo et al. (2004) e Cardoso (2010).
  • Palavras-chave: Peixe-banjo, Cromossomos
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Ph.D. Dissertation: Using the phylogeny of denticulate catfish to study evolution of extra-oral dental tissue

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Rivera Rivera, C.J. (2017). Phylogeny of denticulate catfish (Loricarioidei: Siluriformes) and their use as a new model to understand the evolution and development of dental tissue in new areas of the vertebrate body. Doctoral dissertation, University of Geneva. https://archive-ouverte.unige.ch/unige:101381
http://dx.doi.org/10.13097/archive-ouverte/unige:101381
Not publicly available until until 2019-07-15
Rivera Rivera wrote:ABSTRACT
Dental structures originally emerged as components of the exoskeleton of ancestral vertebrates. Throughout evolution, these structures started being built inside the oral cavity, allowing these ancestral vertebrates to switch to a more predatory lifestyle and opening a vast diversity of new ecological niches. However, to date, the evolutionary and developmental processes by which dental structures can be built in new areas of the body plan are not clear. One of the main limitations for investigating this question is the lack of informative model organisms that show a clear gain of dental structures in new areas of the body. In this study, I focus my studies on catfish (Teleostei: Silurifomes): a highly diverse group of fish that contains a lineage of denticulate catfish (Loricarioidei) in which dental structures presumably emerged de novo on extra-oral body surfaces. I use the Loricarioidei to study the evolutionary and developmental mechanisms through which dentition can be built in new areas of the vertebrate body plan. Because this lineage has never been studied in the context of dental evolution, I must take a multidisciplinary approach at this question to have a broad perspective of the factors related to the gain of dental structures in the loricarioid body. In this work I integrate information that I recovered through studies in the fields of molecular phylogenetics, morphology, evolutionary biology and developmental biology. I begin by determining the phylogenetic landscape in which these denticles emerged, and start by placing the Loricarioidei within the catfish phylogeny. However, the fast molecular evolution of this group and the general diversity of evolutionary rates among catfish species raise methodological challenges for inferring this phylogeny correctly. I address these challenges and propose two new methods, LS³ and LS⁴, to improve any phylogeny inference in which extreme heterogeneous evolutionary rates may be a source of bias. I apply LS⁴ as implemented in a software I produced for this work, LSX, on a new molecular dataset to address the position of the Loricarioidei, and I am able to place this lineage nested within Siluriformes, among groups of catfish that have a naked skin. These results confirm that dental structures indeed emerged de novo in the extra-oral regions of loricarioids. I then ask if the evolutionary emergence of the loricarioid denticles was linked to the formation of other bony elements observed in this lineage, such as dermal bony plates. Through ancestral state reconstruction, I find that the emergence of loricarioid denticles was not linked in evolution to the emergence of dermal bony plates, but that an underlying superficial bone is likely essential for the formation of these dental structures. In the final section of this work I enter into the developmental mechanisms through which these de novo dental structures are built. I use the species Ancistrus triradiatus, which is the new model loricarioid catfish species developed in the laboratory of Juan Montoya-Burgos. Through in situ hybridization and immunostaining studies, I find that loricarioid denticles, despite being an independent emergence of dental structures in new body areas, are produced by deploying the same developmental genetic program that produces oral teeth in other vertebrates. This indicates that dental structures found inside and outside the oral cavity in this loricarioid model species are homologous. In view of these results I conclude that it is possible for vertebrates to gain dental structures in new areas of the body through the cooption of the oral tooth developmental program.
  • Keywords: Phylogenetics, Systematics, Long branch attraction, R, Bioinformatics, Siluriformes, Diplomystidae, Loricarioidei, Armored catfish, Denticles, Trunk dental tissue, Denticle development, Odontodes
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Revision of the genus Aspidoras, and description of new species

Post by bekateen »

Well done Luiz! Congratulations!
http://nou-rau.uem.br/nou-rau/document/ ... s000227650

EDIT: As of 11-October-2018, the entire dissertation is now available here in pdf format: https://www.oceandocs.org/bitstream/han ... sequence=1

Luiz Fernando Caserta Tencatt. (2018). Os cascudos Aspidoras Ihering, 1907 (Siluriformes: Callichthyidae): uma revisão taxonômica, com a descrição de uma espécie nova. Tese (doutorado em Ecologia de Ambientes Aquáticos Continentais), Universidade Estadual de Maringá. Departamento de Biologia.

Luiz Fernando Caserta Tencatt. (2018). The Aspidoras Ihering, 1907 (Siluriformes: Callichthyidae) armored catfishes: a taxonomic review, with description of a new species. Thesis (Doctorate in Ecology of Continental Aquatic Environments), State University of Maringá. Department of Biology.
Tencatt wrote:RESUMO:
Aspidoras foi descrito por Ihering como um gênero monotípico para abrigar A. rochai. Atualmente, o gênero inclui 24 espécies válidas, sendo relativamente bem Distribuído ao longo do território brasileiro, ocorrendo de São Paulo, seu registro mais ao sul, até o Ceará. Após a primeira revisão taxonômica fornecida por Nijssen & Isbrücker 40 anos atrás, nenhum trabalho extensivo com o objetivo de elucidar a taxonomia de Aspidoras foi conduzido. Uma revisão taxonômica abrangente foi realizada para o reconhecimento claro do gênero através de uma nova diagnose, que inclui uma possível característica exclusiva, a presença de pequenas expansões laminares na base dos raios ramificados da nadadeira peitoral. Considerando a nova diagnose e os dados filogenéticos disponíveis atualmente, A. pauciradiatus e A. virgulatus foram excluídas de Aspidoras, sendo transferidas para Corydoras e Scleromystax, respectivamente. A respeito das demais espécies, algumas sinonímias novas são propostas: A. eurycephalus e A. taurus com A. albater; A. menezesi e A. spilotus com A. raimundi; e A. microgaleus e A. marianae com A. poecilus. Adicionalmente, uma espécie nova das bacias dos rios Araguaia e Paraguai no estado do Mato Grosso é descrita. A espécie nova pode ser distinguida de suas congeneres por apresentar a combinação de duas características: parapófise do complexo de vértebras bem desenvolvido, e porção anterior do infraorbital 1 com expansão laminar pouco desenvolvida, ligeiramente ultrapassando a margem posterior da cápsula nasal. Assim, o número de espécies válidas em Aspidoras foi reduzido de 24 para 17. Redescrições para A. albater, A. belenos, A. depinnai, A. fuscoguttatus, A. lakoi, A. maculosus, A. poecilus, A. psammatides, A. raimundi e A. velites foram fornecidas. Uma chave de identificação englobando as espécies de Aspidoras, com exceção de A. carvalhoi, também é fornecida.
Tencatt wrote:ABSTRACT:
Aspidoras was described by Ihering as a monotypic genus to harbour A. rochai. Currently, the genus comprises 24 valid species, and is relatively well distributed across the Brazilian territory, occurring from São Paulo, its southernmost record, to Ceará. After its first taxonomic review provided by Nijssen & Isbrücker 40 years ago, no extensive work aiming to elucidate the taxonomy of Aspidoras was conducted. Therefore, a comprehensive taxonomic review was carried out, allowing the clear recognition of the genus through a new diagnosis that includes a possible exclusive feature, the presence of small laminar expansions on base of the pectoral-fin branched rays. Considering the new diagnosis plus the currently available phylogenetic data, A. pauciradiatus and A. virgulatus are herein excluded from Aspidoras, being transferred to Corydoras and Scleromystax, respectively. Regarding the remaining species, some new synonymies are proposed: A. eurycephalus and A. taurus with A. albater; A. menezesi and A. spilotus with A. raimundi; and A. microgaleus and A. marianae with A. poecilus. Additionally, a new species from the rivers Araguaia and Paraguay basins in Mato Grosso State is described. The new species can be distinguished from its congeners by having the combination of two features: parapophysis of the complex vertebra well developed, and anterior portion of infraorbital 1 with poorly-developed laminar expansion, slightly surpassing posterior margin of nasal capsule. Thereby, the number of valid species within Aspidoras was reduced from 24 to 17. Redescriptions for A. albater, A. belenos, A. depinnai, A. fuscoguttatus, A. lakoi, A. maculosus, A. poecilus, A. psammatides, A. raimundi and A. velites are provided. An identification key encompassing the species of Aspidoras, with exception of A. carvalhoi, is also provided.
"So many catfishes, so little time... and space... and money." - I said this after visiting Pier Aquatics.
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Identification key for catfishes of the Rio Grande basin, upper Paraná river

Post by bekateen »

Thereza, Mariana Ribeiro. (2018). Identification guide for siluriform fish (Teleostei: Ostariophysi) from the Rio Grande basin, upper Paraná river. Masters Dissertation, Universidade Estadual Paulista (UNESP), São José do Rio Preto Campus.

Source: http://hdl.handle.net/11449/153403
PDF: https://repositorio.unesp.br/bitstream/ ... sAllowed=y

Thereza, Mariana Ribeiro. (2018). Guia de identificação dos peixes Siluriformes (Teleostei: Ostariophysi) da bacia do rio Grande, alto rio Paraná. Dissertação Mestrado, Universidade Estadual Paulista (UNESP), Campus de São José do Rio Preto.
Thereza wrote:ABSTRACT:
The Grande River basin belongs to Alto Paraná River, which is the most studied portion of Paraná River basin regarding the icthyofauna. However, this does not indicates that the basin was fully sampled or inventoried. In addition, the researchers do not contain tools to identify the species. The Siluriformes, one of the six orders that is found in the Grande River basin, shows great representativeness with more than 30% (it may reach 35%) of the total of fish species. Our aim was to elaborate an identification guide composed by one identification key, diagnosis and photographic records of each Siluriformes species from the Grande River basin. We found 86 valid species, one new genera and two new species. The species belong to 11 families, whereas Loricariidae was the most diverse one with 41% of the total species richness. The revised material of Siluriformes from the Grande River basin of the fish collection of the Department of Zoology and Botany was mainly from the São Paulo State drainage and few records from Minas Gerais State drainages. The accumulation curve showed an exponential pattern, indicating that despite extensively studied, it is possible that Grande River basin still has new species to be found and described by science.
  • Key words: taxonomy, catfishes, identification key
Thereza wrote:RESUMO:
A bacia do rio Grande pertence a porção mais estudada com relação a ictiofauna da drenagem do rio Paraná, a bacia do Alto rio Paraná. Entretanto, isso não significa que a bacia foi amostrada e inventariada em sua totalidade. Além disso, nenhuma das pesquisas apresenta ferramentas adequadas para a identificação das espécies. Os Siluriformes, uma das seis ordens que compõem a ictiofauna da bacia do rio Grande, apresentam grande representatividade dentro da bacia, com cerca de 30% (podendo chegar a 35%) das espécies de peixes. Sendo assim, o objetivo deste trabalho foi a elaboração de um guia de identificação composto por chave de identificação, diagnoses e registro fotográficos das espécies de Siluriformes da bacia do rio Grande. Foram listadas 86 espécies válidas, um novo gênero e duas novas espécies para a bacia. As espécies pertencem à onze famílias, sendo Loricariidae a mais diversa, com 41% da riqueza de espécies. O material revisado de Siluriformes da bacia do rio Grande da coleção do Departamento de Zoologia de Botânica da UNESP de São José do Rio Preto foi amostrado principalmente nas drenagens do estado de São Paulo e em menor proporção nas drenagens de Minas Gerais. A curva de acumulação de espécies apresentou crescimento exponencial, indicando que apesar de extensivamente estudada, é possível que a bacia do rio Grande ainda apresente novas espécies a serem encontradas e descritas pela ciência.
  • Palavras-chave: Taxonomia, Cascudos, Bagres, Chave de identificação
"So many catfishes, so little time... and space... and money." - I said this after visiting Pier Aquatics.
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bekateen
Posts: 6023
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Taxonomic revision of Pimelodella

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Motta, Veronica de Barros Slobodian. (2018). Taxonomic revision of Pimelodella Eigenmann & Eigenmann, 1888 (Siluriformes: Heptapteridae). Doctoral Thesis, Museu de Zoologia, University of São Paulo, São Paulo. Retrieved 2018-04-18, from http://www.teses.usp.br/teses/disponive ... 18-142608/
INCOMPLETE PDF: http://www.teses.usp.br/teses/disponive ... FICADA.pdf

Motta, Veronica de Barros Slobodian. (2018). Revisão taxonômica de Pimelodella Eigenmann & Eigenmann, 1888 (Siluriformes: Heptapteridae): uma proposta integrativa para a delimitação de espécies com estratégias multidisciplinares. Tese de Doutorado - Programa de Pós-Graduação em Sistemática, Taxonomia e Biodiversidade, Museu de Zoologia, Universidade de São Paulo, 2017.
Veronica de Barros Slobodian Motta wrote:ABSTRACT
Primary taxonomic research in neotropical ichthyology still suffers from limited integration between morphological and molecular tools, despite major recent advancements in both fields. Such tools, if used in an integrative manner, could help in solving long-standing taxonomic problems. The genus Pimelodella Eigenmann & Eigenmann, 1888 is a perfect case for an integrative and multidisciplinary approach in taxonomy. Pimelodella is a genus of the Heptapteridae broadly distributed throughout trans- and cis-Andean South America, and one of the main components of Neotropical Ichthyofauna. Nowadays is the most species-rich genus of the family, with 79 valid species. However, the validity and delimitation of those species is extremely problematic, due their broad geographic distribution, conserved morphology, and ancient and imprecise descriptions. Pimelodella is undoubtedly one of the most severe taxonomic bottlenecks in neotropical ichthyology. This project presents a taxonomic revision of Pimelodella using an integrative morphological-molecular approach. The traditional taxonomic revision covers the genus in its entirety, with all the components of this kind of study. All types were examined, and the number of valid species herein recognized was reduced to 55 species, for which full descriptions are presented. The molecular taxonomy was done for a circumscribed subset of the genus, with representation enough to understand the molecular divergences and compare them with the traditional taxonomy results, allowing an evaluation of the results of the revision.
  • Key words: Comparative Anatomy, Integrative taxonomy, Neotropical Ichthyofauna, Species Trees.
Veronica de Barros Slobodian Motta wrote:RESUMO
A pesquisa taxonômica primária ainda apresenta pouca integração entre as ferramentas morfológicas e moleculares para o estudo de peixes neotropicais, apesar de grandes avanços recentes em ambos os campos. Tais ferramentas, se usadas de maneira integrativa, poderiam solucionar grupos reconhecidos por representarem problemas taxonômicos renitentes. O gênero Pimelodella Eigenmann & Eigenmann, 1888 se enquadra como um ótimo caso para a aplicação de uma estratégia integrativa e multidisciplinar. Pimelodella é um gênero da família Heptapteridae, distribuído amplamente por drenagens sul-americanas trans- e cis-andinas e compreende um dos principais componentes da ictiofauna neotropical. Atualmente é reconhecido como o maior gênero da família, com 79 espécies válidas descritas. Entretanto, a validade e delimitação dessas espécies é problemática, devido à elevada diversidade do gênero, aliada à ampla distribuição, morfologia conservada e descrições antigas e imprecisas. Trata-se de um dos grandes gargalos taxonômicos na sistemática e taxonomia de peixes neotropicais. Este projeto apresenta uma revisão taxonômica de Pimelodella utilizando uma abordagem integrativa morfológica-molecular. A revisão taxonômica clássica cobre a integridade da diversidade do gênero, com todos os componentes deste tipo de estudo. Todos os tipos foram examinados, e o número de espécies validas é aqui reduzido para 55 espécies, para as quais descrições completas são apresentadas. A parte molecular foi realizada em um subgrupo delimitado, com diversidade suficiente para que as estimativas de divergência molecular pudessem ser comparadas aos resultados da revisão morfológica, fornecendo um modelo de avaliação para o restante da revisão.
  • Anatomia Comparada, Árvores de espécies, Ictiofauna Neotropical, Taxonomia integrativa
"So many catfishes, so little time... and space... and money." - I said this after visiting Pier Aquatics.
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