Seasonal variations in zooplankton abundances in the Iturbide reservoir (Isidro Fabela, State of Mexico, Mexico)
Por:
Sarma, SSS, Osnaya-Espinosa, LR, Aguilar-Acosta, CR, Nandini, S
Publicada:
1 jul 2011
Resumen:
This study was undertaken to quantify the seasonal variations of zooplankton (rotifers, cladocerans and copepods) and selected physico-chemical variables (temperature, pH, conductivity, Secchi disc transparency, dissolved oxygen, ammonia, nitrate and phosphate concentrations) in the Iturbide dam. Monthly zooplankton samples (50 I filtered through 50 pm mesh, in duplicates from each of the 4 stations) were collected from February 2008 to January 2009. Simultaneously physico-chemical variables were measured. The zooplankton samples were fixed in 4% formalin in the field. In general, the temperature ranged from 9 to 16 degrees C, rarely exceeding 20 degrees C. Secchi transparency was nearly 100% since the reservoir was shallow (<2 m) even during the rainy seasons. Dissolved oxygen was generally high, 13-18 mg l(-1). Nitrate levels (10 to 170 mu g l(-1)) were low while phosphates were relatively high (9 to 35 mu g l(-1)). The Iturbide reservoir was dominated by rotifer species. We encounte
Filiaciones:
Sarma, SSS:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Los Reyes 54090, Tlalnepantla, Mexico
Osnaya-Espinosa, LR:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Los Reyes 54090, Tlalnepantla, Mexico
Aguilar-Acosta, CR:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Los Reyes 54090, Tlalnepantla, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Los Reyes 54090, Tlalnepantla, Mexico
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