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Inirida river Delphax habitat
Posted: 21 Jun 2005, 22:23
by coryhead
Did some web searching and found no information on the Inirida river system habitat! Anyone have descriptions/pictures and water quality(White/Black water)of this river in South America?
Interested in water paramaters as well as substrate and plant life.
Is the plant life terrestrial or submereged?
Is the water fast moving or slow?
Is the substrate mixed or just sandy?
Are the banks steep or gradual?
Are the banks tree or vegitated?
Is the river deep channel or slopped?
Anything else you can think of or remember
Posted: 23 Jun 2005, 01:58
by Silurus
http://www.icsu-scope.org/downloadpubs/ ... ter05.html
Search for "Inirida" within the page. There's a lot of text here.
Posted: 26 Jun 2005, 19:40
by coryhead
Silurus
Thank you for the doc. I was pleased to find thta the river is practically blackwater
Ph of 5.5 and the color of coffee
Thanks
Posted: 26 Jun 2005, 20:50
by Shane
I thought I would take the liberty of putting the below together from the above link provided by HH. I think it is a very useful reference. It really shows the difference between the whitewater rivers coming from the Andes and those originating in the llanos or Guayana Shield.
For comparison, distilled water is usually .5 to 2 MicroSiemens (uS/cm)
Orinoco Tributaries:
Left Bank tributaries
River pH Conduct (µS/cm)
Guaviare (above Inirida) 6.7 21.5
Guaviare (below Inirida) 6.35 15.7
Inirida 5.05 5.4
Vichada 5.40 3.3
Meta 6.94 48.0
Cinaruco 5.46 5.9
Capanaparo 6.26 15.0
Arauca 6.63 14.7
Apure 7.65 190.0
Right Bank
Ocampo 6.35 16.0
Padamo 6.00 8.0
Ventuari (SB) 5.95 8.0
Ventuari (C) 6.40 12.0
Atabapo 4.35 12.4
Manapiare 6.00 8.0
Parucito 6.36 16.0
Parguaza 5.71 7.4
Suapure 6.20 12.0
Aro 7.14 18.0
Cuchivero 6.81 14.4
Caura 6.50 9.7
Caroni 5.76 6.2
-Shane
Posted: 26 Jun 2005, 23:10
by Shane
Interested in water paramaters as well as substrate and plant life.
Is the plant life terrestrial or submereged?
Is the water fast moving or slow?
Is the substrate mixed or just sandy?
Are the banks steep or gradual?
Are the banks tree or vegitated?
Is the river deep channel or slopped?
I have not collected the Inirida specifically, but have collected different rivers in the same area.
1) No plant life to speak of as the water is so mineral difficient.
2) Water is slow moving.
3) Sunstrate is white sand. You would not find any stones, but the river often exposes the bedrock.
4) Banks are very gradual.
5) Banks free of vegetation for the most part as those that are close are killed by the acidic waters.
6) Not a particularly deep river.
To maintain the correct measurements (pH around 5 and conductivity around 5 uS/cm) would be tricky as it could crash very easily. I would run a full time pH meter on this type of set up.
-Shane
Found this photo on a Colombian website.
Posted: 28 Jun 2005, 12:41
by coryhead
Shane,
I wonder if using peat moss to bring the Ph down naturally would work in this instance? The water in the picture looks rather clear/blue and leads me to wonder how the Ph is so low? One normally associates low Ph with blackwater so I am interested in the mechanism that leads to low Ph in what appears to be white water.
Posted: 28 Jun 2005, 13:34
by MatsP
Unless you have very low "tds" (Total disolved solids), you probably need to run your water through a RO unit before you can get low pH on it.
Once you have low TDS, you could probably use peat to lower the pH. That would simulate the tannic acid that you get in the breakdown of rainforest-fallen-into-rivers.
--
Mats
Posted: 20 Apr 2006, 00:46
by lcgarcia
Hello Shane,
I would like to quote the source of these data, if possible. What is the link mentioned?
Also,
Atabapo river is not a right-margin tributary of the Orinoco. It is a 210 km long tributary of Guaviare, on its right bank, < 0,5 km from the mouth of the Guaviare and ca. 22 km down-stream from the Inirida mouth; it is also blackwater river, as the Inirida. Atabapo headwaters are near the GuainÃa river (or Upper Rio Negro), for this reason it has tempted more than one engineer with the dream of another direct connection between the Orinoco and the Amazon basins, an alternative to the Casiquiare
caño which is not fully navigable. But the dry season is quite severe and the Atabapo does not allow either navigation during these times.
ATABAPO - RÃo formado por los rÃos Guacavà (colombiano), Atacavà y Temà (venezolanos). Sirve de lÃmite entre el departamento del GuainÃa (Colombia) y Venezuela Desemboca en el rÃo Guaviare. (Instituto Geográfico AgustÃn Codazzi. 1996. Diccionario Geográfico de Colombia. CD version)
Shane wrote:I thought I would take the liberty of putting the below together from the above link provided by HH. I think it is a very useful reference. It really shows the difference between the whitewater rivers coming from the Andes and those originating in the llanos or Guayana Shield.
For comparison, distilled water is usually .5 to 2 MicroSiemens (µS/cm)
Orinoco Tributaries:
Left Bank tributaries
River pH Conduct (µS/cm)
Guaviare (above Inirida) 6.7 21.5
Guaviare (below Inirida) 6.35 15.7
Inirida 5.05 5.4
Vichada 5.40 3.3
Meta 6.94 48.0
Cinaruco 5.46 5.9
Capanaparo 6.26 15.0
Arauca 6.63 14.7
Apure 7.65 190.0
Right Bank
Ocampo 6.35 16.0
Padamo 6.00 8.0
Ventuari (SB) 5.95 8.0
Ventuari (C) 6.40 12.0
Atabapo 4.35 12.4
Manapiare 6.00 8.0
Parucito 6.36 16.0
Parguaza 5.71 7.4
Suapure 6.20 12.0
Aro 7.14 18.0
Cuchivero 6.81 14.4
Caura 6.50 9.7
Caroni 5.76 6.2
-Shane