Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela Author Peterson, Christopher C. Community Medical Associates, 76904 San Angelo, Texas, USA peterson@tamu.edu Author Keppeler, Friedrich W. Department of Wildlife and Fisheries Sciences, and Interdisciplinary Program in Ecology and Evolutionary Biology, Texas A & M University, 77843 College Station, Texas, USA fkeppeler@gmail.com Author Saenz, David E. Department of Wildlife and Fisheries Sciences, and Interdisciplinary Program in Ecology and Evolutionary Biology, Texas A & M University, 77843 College Station, Texas, USA dsaenz@tamu.edu Author Bower, Luke M. Department of Wildlife and Fisheries Sciences, and Interdisciplinary Program in Ecology and Evolutionary Biology, Texas A & M University, 77843 College Station, Texas, USA lbower88@tamu.edu Author Winemiller, Kirk O. Department of Wildlife and Fisheries Sciences, and Interdisciplinary Program in Ecology and Evolutionary Biology, Texas A & M University, 77843 College Station, Texas, USA k-winemiller@tamu.edu text Neotropical Ichthyology 2017 2017-07-03 15 2 e 160125 e 160125 http://dx.doi.org/10.1590/1982-0224-20160125 journal article 10.1590/1982-0224-20160125 1982-0224 20704959
Tab. 1. Physical and chemical characteristics measured for Charcote and Charcotico during four survey periods. DO was not measured during November and December. January was the low-water period, September was near the peak of the annual flood pulse, and during November and December floodwaters were gradually receding.
ParameterSeptemberNovemberDecemberJanuary
CharcoticoCharcoteCharcoticoCharcoteCharcoticoCharcoteCharcoticoCharcote
Water temperature (°C)282727282627.52930
Air temperature (°C)3026282730.5302634
pH5.55.5655.55.55.55.75
Water velocity (m/s)0.120.450.390.390.30.3900
DO (mg/L)66––––54
Max. water depth (m)1.222.271.162.151.11.650.51.25
% Aquatic vegetation00050075020
% Canopy cover45552320
Secchi depth (m)1.222.271.1620.50.40.20.35