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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Morphology & behavior of sound production in Pterygoplichthys pardalis

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Slusher, Monique Renee. (2018). "Morphological Correlates and Behavioral Functions of Sound Production in Loricariid Catfish, With a Focus on Pterygoplichthys pardalis (Castelnau, 1855)". Dissertations and Theses. Paper 4155.
https://pdxscholar.library.pdx.edu/open ... _etds/4155
http://dx.doi.org/10.15760/etd.6043
Persistent Identifier: http://archives.pdx.edu/ds/psu/23894
Slusher wrote:Abstract
The Neotropical catfish Pterygoplichthys pardalis produces a harsh stridulation sound upon manual capture. This stridulation sound is made on the abduction of the pectoral fin spine, and is accomplished by friction of a ridged dorsal condyle against a rough spinal fossa of the cleithrum in the pectoral girdle. The sound produced has an average frequency of 121 Hz, and is used with other anti-predator adaptations such as bony subdermal armor and defensive fin-spreading. Pterygoplichthys pardalis does not display behavioral modification in response to conspecific stridulation sound, and therefore it is likely that stridulation sound in P. pardalis is being used as a predator deterrent.
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Reproduction of Hypostomus hemicochliodon, cave effects

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Pacaya Flores, F. (2018). Reproduction in captivity of the "brown carachama" Hypostomus hemicochliodon (loricariidae), in the "Carlos Miguel Castañeda Ruíz" research center. IIAP. San Martín.

Pacaya Flores, F. (2018). Reproducción en cautiverio de la “carachama parda” Hypostomus hemicochliodon (loricariidae), en el centro de investigaciones “Carlos Miguel Castañeda Ruíz”. IIAP. San Martín.

http://renati.sunedu.gob.pe/handle/sunedu/210679
The present study was carried out at the "Carlos Miguel Castañeda Ruiz" Research Center of the IIAP - San Martín Headquarters, located in the Bello Horizonte hamlet of Banda de Shilcayo district, during the months of May 2014-January 2015; aiming to establish a captive reproduction mechanism of the "Brown Carachama" Hypostomus hemicochliodon by proposing three treatments: T1 (PVC nests), T2 (Bamboo stem nests) and a control treatment (natural nests), each treatment with 3 replicas, randomly distributed, each replicate in an area of ​​250 m2, with 180 reproducers of Hypostomus hemicochliodon, randomly distributed 20 individuals per experimental unit. After an adaptation period of 60 days, the experimental phase began. The reproductive samplings and physical-chemical parameters of the water in the ponds were carried out every two weeks. 32 reproductive events were obtained, with T0 (59%) being the most responsive, followed by T2 (25%) and T1 (16%). It was concluded statistically (p> 0.05) that there is a significant difference (value p = 0.0191), indicating in the number of individuals obtained, T1 was better (T1> T2> T0). There is also a significant difference in the weight (g) of eggs obtained, indicating that T1 and T2 are equal, and both are greater than those obtained from T0. The results of the physico-chemical parameters of the water indicate that the Hypostomus hemicochliodon reproducers have a wide range of tolerance compared to their natural environment, achieving their reproduction in captivity.
El presente estudio se realizó en el Centro de Investigaciones “Carlos Miguel Castañeda Ruiz” del IIAP – Sede San Martín, ubicado en el caserío Bello Horizonte del distrito Banda de Shilcayo, durante los meses de Mayo del 2014-Enero del 2015; teniendo como objetivo establecer un mecanismo de reproducción en cautiverio de la “Carachama parda” Hypostomus hemicochliodon mediante el planteamiento de tres tratamientos: T1 (Nidos de PVC), T2 (Nidos de tallo de Bambú) y un tratamiento testigo (Nidos naturales), cada tratamiento con 3 réplicas, distribuidas al azar, cada replica en un área de 250 m2, con 180 reproductores de Hypostomus hemicochliodon, repartidos al azar 20 individuos por unidad experimental. Luego de un periodo de adaptación de 60 días, se inició la fase experimental. Se realizó quincenalmente los muestreos de reproducción y de parámetros físico-químicos del agua de los estanques. Se obtuvieron 32 eventos reproductivos, siendo el de mayor respuesta el T0 (59%), seguida del T2 (25%) y el T1 (16%). Se concluyó estadísticamente (p > 0.05) que existe diferencia significativa (valor p = 0,0191), indicando en el número de individuos obtenidos, el T1 fue mejor (T1>T2>T0). Además existe diferencia significativa en el peso (g) de ovas obtenidas, señalando que el T1 y T2 son iguales, y ambos mayores a los obtenidos del T0. Los resultados de los valores de parámetros físico-químicos del agua nos indican que los reproductores de Hypostomus hemicochliodon tienen un amplio rango de tolerancia en comparación a su medio natural, logrando su reproducción en cautiverio.
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Molecular biodiversity of Hypancistrus zebra

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MAGALHÃES, Maithê Gaspar Pontes. 2018. Description of Molecular Biodiversity of Hypancistrus zebra (Loricariidae: Siluriformes), a Species of Ornamental Fish Threatened with Extinction. Dissertation (Master's Degree in Computational Biology and Systems) - Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro, 2018.

MAGALHÃES, Maithê Gaspar Pontes. 2018. Descrição da Biodiversidade Molecular de Hypancistrus zebra (Loricariidae: Siluriformes), uma Espécie de Peixe Ornamental Ameaçada de Extinção. 2018. 77 f. Dissertação (Mestrado em Biologia Computacional e Sistemas)-Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, 2018.

https://www.arca.fiocruz.br/handle/icict/28446
ABSTRACT
The impact of human activities on Earth is so deep that a new geological epoch, the Anthropocene, has been widely debated. In this new epoch, biodiversity loss stands out among the key features affecting global health. The construction of dams for hydroelectric power generation has the potential to have a major impact on local fauna, especially in regions with high biodiversity and endemism, such as the Brazilian Amazon. Hypancistrus zebra is a species of fish endemic to the Big Bend of the Xingu River, in the Amazon basin, threatened with extinction due to the impact of the Belo Monte Power Plant dam and illegal capture for international fish aquarium. However, until the beginning of this work, only two nucleotide sequences were available from Genbank and the BOLD System, the main public databases of this type of information In this work, seven transcripts of different organs of Hypancistrus zebra were sequenced. We produced more than 200 million readings used to assemble over half a million transcripts. In the generated database, we identified more than 35,000 single nucleotide variants (SNVs) and almost four thousand insertions and deletions (indels) distributed among the seven organs of H. zebra. From the analysis of these data, we developed pairs of primers for amplification of indels identified in six transcripts and of frames with at least three SNVs identified in seven other transcripts. We suggest this set of transcripts as the most suitable for application in works aiming the conservation of this species. Mobile genetic elements of several families were found and expressed in the seven organs. The frequency of transcripts with mobile genetic elements varied from 12% in the transcriptome of the heart to 33% in the gill. In addition, we assembled the mitochondrial genome, with 16,330 bp, of this species. The information and the database produced in this work reduces the knowledge gap on the genetic diversity of Hypancistrus zebra and can be used for population genetics studies and the conservation of this and other phylogenetically close species. This information, especially those related to genetic genetic elements, can also support research on the karyotype variation found in the Loricariidae family, of which H. zebra is a part.
  • KEYWORDS: Transcriptome, Mitochondrial Genome, Catfish, Biodiversity
RESUMO
Os impactos das atividades humanas na Terra são tão profundos que a proposta de definição de uma nova época geológica, o Antropoceno, tem sido amplamente debatida. Nesta nova época, a perda da biodiversidade destaca-se entre as principais características que afetam a saúde global. A construção de barragens para geração de energia hidrelétrica tem potencial de causar grande impacto na fauna local, especialmente em regiões com elevada biodiversidade e endemismo, como a Amazônia brasileira. O Hypancistrus zebra é uma espécie de peixe endêmico da Volta Grande do rio Xingu, na bacia amazônica, ameaçada de extinção devido ao impacto da construção da barragem da Usina de Belo Monte e à captura ilegal para aquariofilia internacional. Apesar disso, até o início desse trabalho, apenas duas sequências de nucleotídeos eram disponíveis no Genbank e no BOLD System, principais bancos de dados públicos desse tipo de informação. Neste trabalho, foram sequenciados sete transcriptomas de diferentes órgãos de Hypancistrus zebra Produzimos mais de 200 milhões de leituras utilizadas para montar mais de meio milhão de transcritos. Neste banco de dados produzido, identificamos mais de 35 mil variantes de nucleotídeo único (SNVs) e quase quatro mil inserções e deleções (indels) distribuídos entre os transcriptomas dos sete órgãos de H. zebra. A partir da análise desses dados, desenvolvemos pares de iniciadores para amplificação de indels identificados em seis transcritos e de janelas contendo pelo menos três SNVs identificadas em sete outros transcritos. Sugerimos esse conjunto de transcritos como os mais adequados para aplicação em trabalhos visando a conservação dessa espécie. Foram encontrados elementos genéticos móveis de diversas famílias e expressos nos sete órgãos. A frequência de trancritos com elementos genéticos móveis variou de 12% no transcriptoma do coração a 33% na brânquia. Além disso, montamos o genoma mitocondrial, com 16.330 pb, dessa espécie. As informações e o banco de dados produzidos neste trabalho reduzem a lacuna de conhecimento sobre a diversidade genética do Hypancistrus zebra e podem ser usados para estudos de genética de população e da conservação dessa e de outras espécies filogenéticamente próximas. Essas informações, em especial às relacionadas a elementos genéticos móveis, também podem dar apoio à investigação sobre a variação cariotípica encontrada na família Loricariidae, da qual o H. zebra faz parte.
  • PALAVRAS-CHAVE: Transcriptoma, Genoma Mitocondrial, Peixes-Gato, Biodiversidade
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Diversity of Trichomycterus in the Rio Doce basin

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Ten new species proposed:
  • Trichomycterus astromycterus sp. nov.
  • T. barrocus sp. nov.
  • T. brucutu sp. nov.
  • T. illuvies sp. nov.
  • T. melanopygius sp. nov.
  • T. ipatinguensis sp. nov.
  • T. pussilipygius sp. nov.
  • T. sordislutum sp. nov.
  • T. vinnulus sp. nov.
  • T. tantalus sp. nov.
Reis, V. J. C. (2018). Diversity of the genus Trichomycterus Valenciennes, 1832 (Siluriformes, Trichomycteridae) in the Rio Doce basin: a systematic study integrating phenotypes, DNA and classical taxonomy. Master's Dissertation, Museu de Zoologia, University of São Paulo, São Paulo. doi:10.11606/D.38.2018.tde-08102018-132640. Retrieved 2019-07-08, from www.teses.usp.br

http://www.teses.usp.br/teses/disponive ... 640/en.php

Reis, V. J. C. (2018). Diversidade do gênero Trichomycterus Valenciennes, 1832 (Siluriformes, Trichomycteridae) na bacia do Rio Doce: um estudo sistemático integrando fenótipos, DNA e taxonomia clássica. (Dissertação, Museu de Zoologia, Universidade de São Paulo).
ABSTRACT
The diversity of the genus Trichomycterus Valenciennes 1832 in the Rio Doce basin is investigated using conventional and modern morphology and DNA analyses. The work is presented in two Chapters. Chapter One, entitled Diversity of the genus Trichomycterus Valenciennes, 1832 (Siluriforms, Trichomycteridae) in the Rio Doce basin: a systematic study integrating phenotypes, DNA and classical taxonomy integratively analyzes specimens of the genus from the entire Rio Doce drainage and adjacent basins, both from available world-wide collections and from active sampling efforts. A combination of phenotypic and DNA (COI barcoding analysis) provides evidence for the existence of 14 species in the basin, 10 of which are new: T. alternatus Eigenmann, 1917; T. argos Lezama et al., 2012; T. astromycterus sp. nov.; T. barrocus sp. nov.; T. brucutu sp. nov.; T. brunoi Barbosa & Costa, 2010; T. immaculatus (Eigenmann & Eigenmann, 1889)] T. illuvies sp. nov.; T. melanopygius sp. nov.; T. ipatinguensis sp. nov.; T. pussilipygius sp. nov.; T. sordislutum sp. nov.; T. vinnulus sp. nov; and T. tantalus sp. nov. . In addition, a lectotype is designated for T. immaculatus and the species is considered as a senior synonym of Trichomycterus pradensis Sarmento-Soares et al., 2005. Although remarkable, such increase in species number of Trichomycterus in a single drainage matches similar recent increments in some other Southeastern Brazilian basins, such as the Paraíba do Sul and Iguaçu. The kind of differentiation among species herein recognized varies, with some of them being well-differentiated in morphology but not in barcoding data, and others showing the opposite phenomenon. The geographical distribution of each of the 14 species is plotted in the Rio Doce basin. The wide geographical distribution of some species (T. alternatus and T. immaculatus) is explained against data from geomorphological processes and comparative information on their biology. Chapter two, The type specimens of Trichomycterus alternatus (Eigenmann, 1917) and T. zonatus (Eigenmann, 1918), with elements for future revisionary work (Teleostei, Siluriformes, Trichomycteridae) focuses on the complex taxonomy, nomenclature and type material status of T. alternatus and T. zonatus. The type series of the two species are analyzed in detail, both in morphology and locality data. Osteological information was obtained with conventional and a new technique of radiographic stereo-triplets. Our new data elucidates their species distinctiveness, diagnostic characteristics, type localities and show that T. zonatus does not occur in the Rio Doce basin.
  • Keywords: barcoding, biogeographical dispertion, Integrative taxonomy, Neotropical catfish, species delimitation
RESUMO
A diversidade do gênero Trichomycterus Valenciennes 1832 na bacia do Rio Doce é investigada utilizando métodos convencionais e modernos em análises morfológicas e moleculares. Os resultados desta dissertação são apresentados em dois capítulos. Capítulo um, intitulado Diversity of the genus Trichomycterus Valenciennes, 1832 (Siluriforms, Trichomycteridae) in the Rio Doce basin: a systematic study integrating phenotypes, DNA and classical taxonomy examinou espécimes pertencentes a este gênero encontrados no Rio Doce e em bacias adjacentes disponíveis em coleções nacionais e internacionais e coletados durante esta dissertação. O conjunto de dados obtidos através de análises morfológicas e moleculares (COI, DNA barcoding) revelou a existência de 14 espécies na bacia do Rio Doce, das quais 10 novas: T. alternatus Eigenmann, 1917; T. argos Lezama et al., 2012; T. astromycterus sp. nov.; T. barrocus sp. nov.; T. brucutu sp. nov.; T. brunoi Barbosa & Costa, 2010; T. immaculatus (Eigenmann & Eigenmann, 1889)] T. illuvies sp. nov.; T. melanopygius sp. nov.; T. ipatinguensis sp. nov.; T. pussilipygius sp. nov.; T. sordislutum sp. nov.; T. vinnulus sp. nov; and T. tantalus sp. nov. Além disso, é designado um lectótipo para T. immaculatus, espécie aqui proposta como sinônimo sênior de Trichomycterus pradensis Sarmento-Soares et al., 2005. O acentuado incremento em número de espécies de Trichomycterus para uma única bacia segue um padrão de crescimento em biodiversidade conhecida do gênero para outras drenagens do sudeste brasileiro a exemplo do rio Paraíba do Sul e Iguaçu. Os tipos de diferenciação detectada entre as espécies aqui tratadas variam, com algumas bem corroboradas morfologicamente, porém muito similares ou indiferenciáveis em análise de DNA barcoding, e outras apresentando o fenômeno oposto. As distribuições geográficas de cada uma das 14 espécies são mapeadas com base em todo o material examinado. A ampla distribuição geográfica de algumas espécies (T. alternatus and T. immaculatus) é explicada através de processos geomorfológicos e informações comparativas sobre suas biologias. O capítulo dois, The type specimens of Trichomycterus alternatus (Eigenmann, 1917) and T. zonatus (Eigenmann, 1918), with elements for future revisionary work (Teleostei, Siluriformes, Trichomycteridae) se concentra em esclarecer a complexa taxonomia, nomenclatura e o status do material tipo de T. alternatus e T. zonatus. As séries tipos das duas espécies foram minuciosamente analisadas tanto para morfologia como para suas respectivas localidades de proveniência. Informações osteológicas foram obtidas através de técnicas de radiografia convencionais e uma nova metodologia chamada stereo triplets. Os dados obtidos corroboram as respectivas espécies como distintas, e permitem uma avaliação precisa de seus respectivos caracteres diagnósticos e localidades tipo. Também se chegou à conclusão que T. zonatus não ocorre na bacia do Rio Doce.
  • Keywords: bagres neotropicais, barcoding, delimitação de espécies, dispersão biogeográfica, Taxonomia integrativa
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Physicochemistry of water at Panaque nigrolineatus holding facilities

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Diaz, Ana Milena. (2018). Evaluation of the physicochemical parameters of the water and the condition of the fins in the real fish (Panaque nigrolineatus), during the storage in the export warehouse of Bogotá. De La Salle University, Animal Husbandry Program. Bogotá D.C., June 2018.

http://repository.lasalle.edu.co/handle/10185/28740
Full PDF: http://repository.lasalle.edu.co/bitstr ... sAllowed=y

Diaz, Ana Milena. (2018). Evaluación de parámetros fisicoquímic0s del agua y del estado de las aletas en el pez cucha real (Panaque nigrolineatus), durante el acopio en bodega de exportación de Bogotá. Universidad De la Salle, Programa De Zootecnia. Bogotá D.C., Junio De 2018.

Milena wrote:ABSTRACT
The family of loricariid fish is typically South American, very diverse in forms, sizes and even in eating habits, there are about 500 species, most are for ornamental use. They are very popular fish in aquariums around the world, as they act as cleaners of the glasses of aquariums, by consuming the algae that adhere to them. The genus Panaque or cucha real is a species of singular beauty, desired by aquarists from all over the world. In Colombia they are called buckets and in the world they are called plecos or sucker mouth catfish.

The export of fish is based on the capture, stockpiling, handling in the winery and export, which leads to failures on the part of the fishermen in the way they are caught and the bad handling that is given to the fish, which leads to losses of animals or mistreatment of them at the fins level. The present work seeks to analyze whether water quality and post-capture management affects the survival and quality of the fins in individuals stocked in warehouses, prior to being sent abroad.
Milena wrote:Resumen
La familia de los peces loricáridos es típicamente suramericana, muy diversa en formas, tallas
e incluso en hábitos alimentarios, existiendo cerca de 500 especies, la mayoría son de uso
ornamental. Son peces muy populares en los acuarios de todo el mundo, pues actúan como
limpiadores de los vidrios de los acuarios, al consumir las algas que se adhieren a estos. El
género Panaque o cucha real es una especie de singular belleza, apetecida por acuarófilos de
todo el mundo. En Colombia se les llama cuchas y en el mundo se les denomina plecos o sucker
mouth catfish.

La exportación de peces se basa en la captura, acopio, manejo en bodega y exportación, lo cual
conlleva fallas por parte de los pescadores en la forma como los capturan y el mal manejo que
se les da a los peces, lo que acarrea pérdidas de animales o maltrato de los mismos a nivel de
aletas. El presente trabajo busca analizar si la calidad del agua y el manejo postcaptura, afecta
la supervivencia y la calidad de las aletas en individuos acopiados en bodegas, previos a ser
enviados al exterior.
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Nudging: A new social behavior described in Corydoras aeneus cory catfish

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Riley, R. J. (2019). Keeping it together: the effect of familiarity, personality, and active interactions on group coordination. Doctoral thesis, Department of Zoology, University of Cambridge. Doi: 10.17863/CAM.35774

https://www.repository.cam.ac.uk/handle/1810/288486
https://doi.org/10.17863/CAM.35774
ABSTRACT
Group coordination is a universal feature of social life. Animals form social groups for a variety of reasons, including predator evasion and more efficient foraging, and individuals living in social groups must coordinate their activities in order for groups to function. Consequently, the factors that facilitate or impede group coordination are of great interest in understanding the lives of social animals. Familiarity between individuals has well-documented effects on group coordination, with familiar groups outperforming unfamiliar ones in predator evasion, foraging, and cohesion. Individuals also generally prefer to coordinate with familiar conspecifics over unfamiliar ones. Despite these advantages, the mechanisms through which familiarity might aid group coordination are poorly understood. Similarly, the individual personalities of group members have well-documented effects on group performance: bold individuals are more likely to be ‘leaders’ and determine the direction of group movements, and groups comprised of individuals of differing personalities outperform groups of all bold or all shy individuals. While the effect of individual personalities on group behaviour has been recorded extensively, the ways in which individuals affect each other’s behaviour are still poorly documented. In particular, active interactions where one individual can directly affect the behaviour of others have received limited attention, as it is difficult to distinguish such actions from passive effects. I used two systems to investigate how individual behaviours can lead to group coordination. In three-spined sticklebacks (Gasterosteus aculeatus), well-established boldness assays allowed me to assess the effects of personality and familiarity on 1) coordination between pairs of fish; I found that individuals in unfamiliar pairs exhibited coordination patterns consistent with their individual personalities, with bold individuals more likely to leave cover independently, while in familiar pairs, individuals behaved in ways seemingly unrelated to their boldness scores. I also investigated how personality and familiarity affect 2) group coordination and individual performance in a problem-solving paradigm. I found that familiarity, relative individual personality, and group mean personality interact to affect individual foraging success, and that group cohesion was affected by the interaction of group familiarity and group mean personality. These results suggest that individual characteristics can impact the behaviour of groups, and that the characteristics of an individual’s group can in turn affect an individual’s behaviour and success. In the Bronze Cory catfish (Corydoras aeneus), I described a novel tactile interaction style termed ‘nudging’ that individuals use during group coordination. I investigated 3) the effect of familiarity on nudging and coordination in pairs and triplets. These results show that nudging can be used to overcome the disadvantages of familiarity, which has important implications for how communication can underlie group coordination in the absence of familiarity. I then investigated how 4) nudging affects group coordination following a flight response to a potential threat. I demonstrated that nudging leads to a higher likelihood of group cohesion and longer group flight times. This shows how active interactions can mediate group responses and affect the ecologically relevant scenario of predator evasion. Finally, I investigated 5) the development of this nudging behaviour. My results show that Bronze Cory catfish larvae develop toleration for tactile stimulation with age alongside their propensity to nudge conspecifics. This suggests that Bronze Cory catfish larvae require social feedback to develop appropriate responses to nudges from conspecifics and supports the important role of nudging in Bronze Cory catfish sociality. The presence of active interactions in the Bronze Cory catfish` modifies the way that social behaviour manifests in this species and has great potential for further questions about social behaviour and group functioning.
  • Keywords: Social behaviour, familiarity, group coordination
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Developmental and functional analysis of scutes in the armored catfish Corydoras aeneus,

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Developmental and functional analysis of scutes in the armored catfish Corydoras aeneus

Be careful : Not a science news, but a Thesis !

Author : Emily Volk
Source : Undergraduate Honors These , University of Colorado, Boulder, April 4 2019
HTML : https://scholar.colorado.edu/honr_theses/1832/
PDF : https://scholar.colorado.edu/cgi/viewco ... onr_theses
Abstract wrote: Fish scales are specialized biological structures of current interest in innovative materials design because of the combination of protective function, flexibility, and light weight they offer. This study presents a developmental and functional investigation of a particular fish scale structure, the scutes (bony external plates) of the armored Bronze Corydoras Catfish (Corydoras aeneus). Scutes in this model fish species were analyzed via three complementary approaches. First, scutes were documented throughout fish development via high-quality microscope images. These images were subsequently used to inform fabrication of synthetic models to characterize the relationship between scute overlap and overall bending stiffness of scute assemblies. These models indicated that scute overlap resulted in a 318% increase in bending stiffness. My study also presents insight into how increased bending stiffness could influence the swimming strategy of live larval C. aeneus. By synthesizing the insight from these developmental and functional investigations of the scutes of C. aeneus, my study aims to contribute to a better functional understanding of the evolutionary pathway of C. aeneus as well as inform fabrication of future innovative designs utilizing the unique structure and dynamics of scute assemblies.

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Revision of the Genus Mastiglanis (Bockmann, 1944)

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Modertor's note, Mastiglanis sp(1) was described in July 2020 and is now Mastiglanis yaguas. (link here: viewtopic.php?f=14&t=49301)

Fuster, D. R. F. (2019). Revisión taxonómica del género Mastiglanis (Bockmann, 1994)(Siluriformes: Heptapteridae) en Perú. Thesis for a Professional Degree in Biology, Universidad Nacional Mayor de San Marcos, Universidad del Perú, Decana de América. Escuela Profesional de Ciencias Biológicas.

http://cybertesis.unmsm.edu.pe/handle/cybertesis/10514
PDF: http://cybertesis.unmsm.edu.pe/bitstrea ... sAllowed=y

NOTE: I've added the two undescribed fish to the CLOG as Mastiglanis sp(1) and Mastiglanis sp(2).
ABSTRACT
Mastiglanis is a monotypic genus, with the type species M. asopos, belonging to Heptapteridae. This freshwater species is widely distributed along the Amazon and Orinoco River basins. In this research, a taxonomic review of specimens collected from the Putumayo and Nanay River, Amazon rivers basin in Peru. The morphological analysis was carried out taking morphometric (36 measurements) and meristic (20 counts) data, with the help of a digital caliper and stereo microscope; some osteological counts and descriptions were made of clear and stained material. This study revealed two new species of Mastiglanis. The two new species of Mastiglanis differ from M. asopos by having short snout. Mastiglanis sp1 is differentiated from its congeners by having eight branched anal fin rays and a large pelvic fin large; additionally, Mastiglanis sp1 is differentiated from M. asopos by having more number of vertebrae, epibranchial spines, ceratobranchial spines, by having a short process in the sinfisial region of the premaxila, thin body, broad interorbital space, big eyes, head tall, and thin. Mastiglanis sp2 differs from all its congeners by having a lower caudal peduncle; additionally, it differs from M. asopos by having a larger eye diameter; and from Mastiglanis sp1 by having more branched anal fin rays, short pelvic-fin, broader head, smaller interorbital space and smaller posterior nostrils space. The two new species are distributed in the Yaguas River, tributary of the Putumayo River; and in the Nanay River tributaries from the Amazon basin, from the Loreto Department, Peru.
  • Keywords: small catfish, morphology, freshwater, Peruvian Amazon.
RESUMEN
Mastiglanis es un género monotípico, con la especie tipo M. asopos, que pertenece a Heptapteridae, esta especie de agua dulce se encuentra ampliamente distribuida a lo largo de los ríos Amazonas y Orinoco. En la investigación se realizó una revisión taxonómica de ejemplares colectados en las cuencas del Putumayo y Amazonas en Perú. El análisis morfológico fue realizado considerando datos morfométricos (36 medidas) y merísticos (20 conteos), con ayuda de un calibrador digital y estéreo microscopio; algunos conteos y descripciones osteológicas fueron realizados de material diafanizado. En este estudio se revelan dos nuevas especies de Mastiglanis. Las dos especies nuevas de Mastiglanis se diferencian de M. asopos por tener el hocico corto. Mastiglanis sp1 se diferencia de sus congéneres por presentar 8 radios ramificados en la aleta anal, aleta pélvica grande, adicionalmente Mastiglanis sp1 es diferenciado de M. asopos por presentar mayor número de vertebras, espinas epibranquiales, espinas ceratobranquiales, por tener el proceso en la región sinfisial de la premaxila corto, cuerpo delgado, espacio interorbital amplio, ojo grande, cabeza alta y delgada. Mastiglanis sp2, se diferencia de todos sus congéneres por presentar el pedúnculo caudal bajo; adicionalmente se diferencia de M. asopos por tener un mayor diámetro del ojo; y de Mastiglanis sp1 por tener más radios anales ramificados, aleta pélvica corta, cabeza ancha, espacio interorbital menor y el espacio entre las narinas posteriores menores. Las dos nuevas especies se encuentran distribuidas en los ríos Yaguas, tributario del rio Putumayo; y en el río Nanay tributario de la cuenca del Amazonas, en el departamento de Loreto, Perú.
  • Palabras claves: bagres menudos, morfología, agua dulce, Amazonia Peruana
Attachments
Figure 9. Distribution map of Mastiglanis asopos (white triangles), Mastiglanis sp.1 (red circles) and Mastiglanis sp.2 (yellow star) in the neotropical region. The star symbol represents the type locality of each species. Each symbol can represent more than one lot.
Figure 9. Distribution map of Mastiglanis asopos (white triangles), Mastiglanis sp.1 (red circles) and Mastiglanis sp.2 (yellow star) in the neotropical region. The star symbol represents the type locality of each species. Each symbol can represent more than one lot.
Mastiglanis sp.1, new species, MUSM 66612, 49.1 mm LE
Mastiglanis sp.1, new species, MUSM 66612, 49.1 mm LE
Mastiglanis sp.2, MUSM 55055, Holotype, 43.7 mm LE
Mastiglanis sp.2, MUSM 55055, Holotype, 43.7 mm LE
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Two new Hypostomus species from the Rio Maranhao and Rio Sao Bartolomeu, Central Brazil

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SOARES, Yan Felipe Figueira. (2019). Description of new species of Hypostomus (Siluriformes: Loricariidae) for Central Brazil. Dissertation (Master in Zoology). University of Brasilia, Brasilia.

https://repositorio.unb.br/handle/10482/35787
PDF: https://repositorio.unb.br/bitstream/10 ... Soares.pdf
ABSTRACT:
We described two new species of Hypostomus from central Brazil based on morphological data sets, with lineages previously identified in genomic studies. A machine learning classification procedure (random forest) was used to investigate the morphological variation and to identify species diagnostic characters. The new species Hypostomus sp. nov. A is characterized by the reduced size, dark spots under a light background, deeper caudal peduncle, smaller first ray of the pectoral fin and smaller base of the dorsal fin when compared to its congeners. Hypostomus sp. nov. A is known for the headwaters of the river Maranhão, upper Tocantins river basin, Federal District, Brazil. The second new species Hypostomus sp. nov. B is characterized by dark spots under a light background, absence of plaques in the abdomen, smaller first ray of the pelvic fin, smaller first ray of the pectoral fin and smaller body size. Hypostomus sp. nov. B is known for the headwaters of the São Bartolomeu river, upper Paraná river basin, Federal District Brazil.
RESUMO:
Descrevemos duas novas espécies de Hypostomus do Brasil central que foram identificadas previamente em estudos genômicos, promovendo uma descrição com a diagnose baseada em conjuntos de dados morfológicos. Foi utilizado um procedimento de classificação de aprendizado de máquina (random forest) para investigar a variação morfológica e identificar caracteres diagnósticos para as espécies. A nova espécie Hypostomus sp. nov. A é caracterizada pelo tamanho reduzido, pontos escuros sob um fundo claro, altura do pedúnculo caudal maior, primeiro raio da nadadeira peitoral menor e base da nadadeira dorsal menor, quando comparada aos seus congêneres. Hypostomus sp. nov. A é conhecida das cabeceiras do rio Maranhão, bacia do alto rio Tocantins, Distrito Federal, Brasil. A segunda nova espécie Hypostomus sp. nov. B é caracterizada por possuir pontos escuros sob um fundo claro, ausência de placas na região do abdômen, primeiro raio da nadadeira pélvica menor, primeiro raio da nadadeira peitoral menor, tamanho corporal menor. Hypostomus sp. nov. B é conhecida das cabeceiras do rio São Bartolomeu, bacia do alto rio Paraná, Distrito Federal Brasil.
Attachments
Distribution of Hypostomus sp. nov. A (blue square) and Hypostomus sp. nov. B (pink rhombus). Triangle represents the type locale. The acronyms AP, AT and MSF mean Alto Parana, Alto Tocantins and Mid São Francisco, respectively
Distribution of Hypostomus sp. nov. A (blue square) and Hypostomus sp. nov. B (pink rhombus). Triangle represents the type locale. The acronyms AP, AT and MSF mean Alto Parana, Alto Tocantins and Mid São Francisco, respectively
Hypostomus sp. nov. A, CIUNB 1490, paratype, upper Tocantins river basin
Hypostomus sp. nov. A, CIUNB 1490, paratype, upper Tocantins river basin
Hypostomus sp. Nov B, Taquara Stream, Upper Parana River Basin
Hypostomus sp. Nov B, Taquara Stream, Upper Parana River Basin
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Re: The Dissertations Sticky

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Martine, G. (2019). Distribuição do ictioplâncton em diferentes micro-habitats do médio Rio Uruguai, Brasil. Dissertação de Mestrado, Programa de Pós Graduação em Ambiente e Tecnologias Sustentáveis da Universidade Federal da Fronteira Sul.

https://rd.uffs.edu.br/handle/prefix/3098
PDF: https://rd.uffs.edu.br/bitstream/prefix ... ARTINE.pdf
ABSTRACT
Research related to ichthyoplankton provides relevant information about its initial development, but for the Uruguay River basin, little is known about which environments are preferred by fish larvae during the early stages of their life cycle. From this, the objective of this work was to evaluate five microhabitats in three sample stations in the middle Uruguay River, located in the municipalities of Porto Mauá, Porto Vera Cruz and São Nicolau, RS, respectively. Monthly collections were carried out at night, from November 2017 to January 2018, totaling 180 samplings. The spatial distribution of the sampling stations lies in a stretch of approximately 150 km. Each sampling station presents four microhabitats in the Uruguay River: rapids, island, margin and well; and one near the mouth of a tributary river: Santa Rosa River (PM), Amandaú River (PVC) and Rio Piratinim (SN). At all points, active collections were carried out from trawls with a mesh of 500 μm conical-cylindrical plankton. The variables: transparency, velocity, temperature, dissolved oxygen, electrical conductivity, pH, depth and river level were measured monthly. The samples collected were fixed in 4% formaldehyde, sorted and identified at the species level. The larval stages considered were: vitelline larval (LV), pre-flexion larval (LP), larval flexion (LF) and post-flexion larval (OLP). 1,523 larvae were captured, four orders, 14 families, 27 genera and 19 species. Of these, 92.12% belong to the Siluriform order, with the Pimelodidae family (89.43%) being the most abundant, being Parapimelodus valenciennis (50.10%), Pimelodus maculatus (15.30%) and Iheringichthys labrosus (8.14%). Migratory fish species were also captured: the Characiformes Megaleporinus obtusidens and Salminus brasiliensis and the Siluriformes Luciopimelodus pati, Pimelodus maculatus, Pseudoplatystoma corruscans and Sorubim lima. There was no statistically significant difference in larval distribution in the collection months (p> 0.05). Regarding the total larvae / 10m3 and the sampling stations, PVC had the highest densities (p <0.05). As for the larval stages and the sampling stations, LV presented the highest density in the PM station (p <0.05). For the larval stages of pre-flexion, flexion and post-flexion, there was a significant statistical difference (p <0.05), in which PVC presented the highest densities. The CCA revealed the most grouped and segregated wells and rapids of the island, margin and tributary (P <0.05) microhabitats. The CCA1 showed that water velocity (p <0.05), depth (p <0.05) and water transparency (p <0.05) were the most important factors for the distribution of larval stages. The LV stage (p <0.05) was positively correlated with water velocity and the greatest depth of the environment. Post-flexion larvae (p <0.05) were mainly related to greater transparency and inversely related to water depth and velocity. The NMDS revealed clear spatial segregation between the channel and island microhabitats of the margin and the tributary. According to the results, it is concluded that the PVC sampling station had the highest densities of fish larvae, and the micro-habitat Ilha represents the site of higher incidence of total larvae, which characterizes it as a nursery of fish larvae in initial stages, mainly Siluriformes.
Keywords: Reproduction of fish. Eggs and larvae. Spatial distribution. Nursery areas. Medium river Uruguay.
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Bacterial and fungal symbionts in the guts of woodlice and Panaque nigrolineatus

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Marden, Caroline Louise. (2019). Characterisation of the microbial communities in the gastrointestinal tract of wood-eating organisms. Doctoral dissertation, University of Portsmouth.

https://ethos.bl.uk/OrderDetails.do?uin ... hos.800220
https://researchportal.port.ac.uk/porta ... d395).html
PDF: https://researchportal.port.ac.uk/porta ... r_viva.pdf
ABSTRACT
Wood recycling is key to biogeochemical cycling and largely driven by microorganisms, with bacteria and fungi naturally coexisting together in the environment. Terrestrial isopods Oniscus asellus and Porcellio scaber have adaptations to enable them to colonise diverse terrestrial environments and scavenge on dead and decaying organic matter that is rich in cellulose. The Amazonian catfish, Panaque nigrolineatus have physiological adaptions enabling the scraping and consumption of wood, facilitating a detritivorous dietary strategy. Substrates high in lignocellulose are difficult to degrade and as yet, it is unclear whether these organisms obtain any direct nutritional benefits from ingestion and degradation of lignocellulose. However, there are numerous systems that rely on microbial symbioses to provide energy and other nutritional benefits for host organisms via lignocellulose decomposition. Whilst previous studies on the microbial communities of O. asellus, P. scaber and P. nigrolineatus, have focused upon the bacterial populations, the presence and role of fungi in lignocellulose degradation has not yet been examined. These studies describe the bacterial and fungal communities within the gastrointestinal tracts using next generation sequencing. The hepatopancreas of O. asellus and P. scaber was predominantly colonised by one bacterial species and had more fungal diversity. The hindgut was colonised bymore diverse bacterial and fungal communities. Due to the woodlouse inhabiting diverse environments, including those with heavy metal pollution, culture methods were used to detect antimicrobial resistance in the gastrointestinal tract of woodlice. The effects of diet on enteric fungal populations were examined in each gastrointestinal tract region of P. nigrolineatus and fungal species were found to vary in different regions of the gastrointestinal tract as a function of diet. This is the first study to investigate the bacterial and fungal communities within the hepatopancreas and hindgut from two species of woodlice, using the same individual woodlouse, using next generation sequencing. This is the first study to detect fungi in the digestive tract of any woodlice. This study is the first to examine the fungal community in a xylivorous fish and results support the hypothesis that diet influences fungal distribution and diversity within the gastrointestinal tract of P. nigrolineatus. This study provides new insights into the microbial communities that may have a symbiotic role involved in wood degradation in the GI tracts of woodeating organisms. This study also highlights the need for further research into fungi inhabiting many diverse environments to give more complete and balanced information about the absence and presence of microorganisms.
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Larviculture of acari bread Hypancistrus sp. L333

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REIS, Ryuller Gama Abreu Reis. (2020). Larviculture of acari bread Hypancistrus sp. L333 (Siluriformes Locariidae): food management and stocking density. Dissertation (Master in Aquaculture and Tropical Aquatic Resources) - Federal Rural University of the Amazon, Belém, 2020.

http://repositorio.ufra.edu.br/jspui/ha ... 456789/961
Abstract:
Acari Pão L333 (Hypancistrus sp.) is an Amazonian species, endemic from the Xingu River, with an important potential for ornamental aquaculture, because its colors and the high value in the market of ornamental aquatic organisms. However, there is little scientific information about the ideal breeding conditions for the species, such as reproduction, larviculture, feed management and nutrition. In this context, one of the major gaps to the captive production of ornamental aquatic organisms is the lack of knowledge about the requirements and food management of the species. The present study aimed to evaluate some managements in the intensive larviculture of Acari Pão L333, more specifically to determine the amount of live food (Artemia nauplii), the stocking density and the time for the food transition from live food to the formulated diet (weaning). The first study was divided into two experiments, where the objective were to evaluate four initial prey concentrations (T100 -100, T200 - 200, T300 - 300 and T400 - 400 nauplii / larvae / day), with amount of prey doubling every six days of the experiment. The second experiment was carried out to determine the ideal stocking density (1, 5, 10, 15 larvae / L) for the species. In the second study, the best time for the weaning was evaluated, in which the substitution was tested after 5, 10, 15 and 20 days of live food supplied. In addition, two treatments were added, in which the larvae received the live food and the formulated diet throughout the experimental period. The results showed that for the larviculture of the species the initial prey concentration of 400 artemia nauplii / larvae / day and the stocking density of 5 larvae / L are recommended. The best period for the weaning was after five days of live food supplied; however, the results of survival with the exclusive use of the formulated diet emerges as a great possibility for future studies on the topic.
  • Keywords: Acari bread L333 - Larviculture, Ornamental fish
    Acari bread L333 - Food, Siluriformes Lori, Hypancistrus sp., Ornamental fish culture, Ornamental fish species
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Structure of the rheophilic ichthyofauna of the Xingu River

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COMMENT: This thesis has some great maps of the area, and also many good photographs of the habitats present along the Xingu. Many diverse rocky and sandy surfaces are shown where loricariids were collected, any of which would probably look neat in an aquarium

Gonçalves, A. P. (2020). Structure of the rheophilic ichthyofauna of the Xingu river, Brazilian Amazon: environmental, spatial and temporal effects on the species distribution pattern. Doctoral Thesis, Biologia de Água Doce e Pesca Interior - BADPI.

Gonçalves, A. P. (2020). Estrutura da ictiofauna reofílica do rio Xingu, Amazônia Brasileira: efeitos ambientais, espaciais e temporais no padrão de distribuição das espécies. Tese, Doutora. Biologia de Água Doce e Pesca Interior - BADPI Doutorado - BADPI.

https://repositorio.inpa.gov.br/handle/1/13016
https://repositorio.inpa.gov.br/bitstre ... cavels.pdf
ABSTRACT
Rapids and waterfalls are environments that have extreme and peculiar environmental characteristics when compared to other river stretches. These sites harbor fish species with unique ecological characteristics, with remarkable morphological and behavioral specializations related to the life in structurally complex environments with fast and turbulent waters. In this study we evaluated the structure of the ichthyofauna in the rapids of Xingu River, aiming to a better understanding of the fish assemblage composition and its spatial and temporal variations. We recorded 160 fish species in the rapids, belonging to 97 genera, 25 families and seven orders. Characiformes presented the highest number of families, and Siluriformes the highest number of species. Fifty-two species are endemic to the Xingu River, 11 species are officially considered under some degree of extinction risk, and not all species are protected by the large mosaic of conservation units in the Xingu River basin. The stretch corresponding to the Volta Grande do Xingu harbors the highest diversity of rheophilic fishes along the analyzed stretch of the river, and some species apparently occur only in that stretch. The Volta Grande do Xingu is one of the largest continuous rapids in the world, but the structure of the fish assemblages of this region varies both seasonaly and regarding local habitat characteristics. The largest variations were observed between the main channel rapids of the Xingu and Bacajá rivers, and between the flooding period compared to the receding and dought periods. Although some species occurred in just a few sites or were more abundant in some periods of the hydrologic cycle, several species occurred in all sampling sites and periods, highlighting the possible role of habitat connectivity along the rapids continuum. However, additional analyses of the distribution and abundance of Loricariidae species in Volta Grande evidenced the role of spatial factors acting at different distance scales, which together with the local structure of microhabitats are essential for the maintenance of the loricariid diversity. Food availability did not have a major influence on the structure of Loricariid assemblages, apparently due to the high availability of food items from epilithic and benthic macroinvertebrates. Despite the biological importance of waterfalls and rapids environments, especially those of Volta Grande, a hydroelectric megadam is installed in the region and a huge gold mining project is being licensed, threatening one of the world's most spectacular river rapids.
RESUMO
As corredeiras e cachoeiras são ambientes que apresentam características ambientais extremas e diferentes da maior parte do curso dos rios. Esses locais abrigam espécies de peixes com características ecológicas peculiares, com especializações morfológicas e comportamentais relacionados à vida em ambientes estruturalmente complexos e com águas rápidas e turbulentas. Neste estudo avaliamos a estrutura da ictiofauna associada aos ambientes de corredeiras do rio Xingu, buscando um melhor entendimento da composição das assembleias de peixes e suas variações espaciais e temporais. Foram registradas 160 espécies de peixes abrigando as corredeiras do rio Xingu, pertencentes a 97 gêneros, 25 famílias e sete ordens. Characiformes apresentou o maior número de famílias e Siluriformes o maior número de espécies. Cinquenta e duas espécies são endêmicas do rio Xingu, 11 espécies são oficialmente consideradas sob algum grau de ameaça de extinção, e nem todas as espécies estão protegidas pelo grande mosaico de unidades de conservação presentes na bacia do rio Xingu. O trecho da Volta Grande do rio Xingu apresenta a maior diversidade de espécies de peixes reofílicos, e algumas espécies ocorrem apenas naquele trecho. A Volta Grande é um dos maiores contínuos de corredeiras do mundo, mas a estrutura das assembleias de peixes dessa região apresenta diferenças em relação aos períodos sazonais e em função das características locais dos sítios de amostragem. As maiores variações foram observada entre as corredeiras do canal principal do rio Xingu e as corredeiras do rio Bacajá, e entre os períodos de enchente em relação à vazante e seca. Embora algumas espécies tenham ocorrido em apenas alguns sítios ou tenham sido mais abundantes em alguns períodos, a Volta Grande apresenta um conjunto de espécies que ocorrem em todos os sítios e períodos, evidenciando o possível papel da conectividade de hábitats ao longo do contínuo de corredeiras. Uma análise mais aprofundada da distribuição e abundância de espécies de Loricariidae na Volta Grande demonstrou que fatores espaciais em diferentes escalas de distância, bem como a estrutura local de micro-hábitats são essenciais para a manutenção das espécies dessa família. Disponibilidade de alimento não apresentou grande influência na estruturação das assembleias de Loricariídeos, aparentemente devido à alta disponibilidade de itens alimentares do epilíton e de macroinvertebrados bentônicos. Apesar da importância biológica dos ambientes de cachoeiras e corredeiras, em especial as da Volta Grande, um megaprojeto hidrelétrico está sendo finalizado nessa região e há projetos de mineração de ouro sendo licenciados, colocando em risco uma das áreas de corredeiras mais excepcionais do mundo.
Attachments
Xingu rocks.png
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Morphological variation of Transancistrus santarosensis

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Valverde Tobar, C. L. (2020). Morphological aspects of Transancistrus santarosensis (Loricariidae) present in the trans-Andean basins of the Andes Mountains of Ecuador. Thesis, University of Guayaquil.

http://repositorio.ug.edu.ec/handle/redug/48681
PDF: http://repositorio.ug.edu.ec/bitstream/ ... 0%20CD.pdf
ABSTRACT
Geometric morphometry is the application of statistical analysis about the variation in the real shape of organisms and can be used to differentiate populations or species. This study focuses on comparing the morphological and bone variations of Transancistrus santarosensis in different locations in the western part of the Andes Mountains of Ecuador. The samples of T. santarosensis were obtained in the basins of the Caluma, BuluBulu, Tenguel and Santa Rosa rivers in a range of 100 to 280 masl. A total of 65 specimens of T. santarosensis were analyzed and the size ranges ranged from 5.1 to 12.5 mm in total length. Regarding the consensus form of the specimens from each locality, significant differences p <0.0005 were observed. The northern specimens presented a reduction between the anal fin and the caudal fin, as well as between the dorsal and adipose fins; in addition, a reduction in the abdomen was observed in the southern specimens. The specimens from the four localities showed no differences in the morphology of the cephalic plates. The morphology of the plates is characteristic at the gender level since the same morphological characters are observed in T. aequinoctialis.
  • Keywords: Geometric morphometry, Morphological variations, Consensus shape, Cephalic plates, Alizarin red.
Valverde Tobar, C. L. (2020). Aspectos morfológicos de Transancistrus santarosensis (Loricariidae) presentes en las cuencas transandinas de la Cordillera de los Andes de Ecuador. Tesis, Universidad de Guayaquil.
RESUMEN
La morfometría geométrica es la aplicación de análisis estadísticos acerca de la variación de la forma real de los organismos y puede ser utilizada para diferenciar poblaciones o especies. Este estudio se enfoca en comparar las variaciones morfológicas y óseos de Transancistrus santarosensis en distintas localidades de la zona occidental de la Cordillera de los Andes de Ecuador. Las muestras de T. santarosensis fueron obtenidos en las cuencas de los Ríos Caluma, BuluBulu, Tenguel y Santa Rosa en un rango de 100 a 280 msnm. Se analizaron en total 65 especímenes de T. santarosensis y los rangos de tallas oscilaron entre 5.1 a 12,5 mm de longitud total. En cuanto a la forma consenso de los especímenes de cada localidad, se observó diferencias significativas p < 0.0005. Los especímenes del norte presentaron una reducción entre la aleta anal y la aleta caudal, así mismo entre la aleta dorsal y la adiposa; además se observó una reducción en el abdomen en los especímenes del sur. Los especímenes de las cuatro localidades no mostraron diferencias en la morfología de las placas cefálicas. L a morfología de las placas es característica a nivel de género ya que, en T. aequinoctialis se observan los mismos caracteres morfológicos.
  • PALABRAS CLAVES:
    Morfometría geométrica, variaciones morfológicas, forma
    consenso, placas cefálicas, rojo alizarina
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