Seasonal changes in the zooplankton abundances of the reservoir Valle de Bravo (State of Mexico, Mexico)
Por:
Nandini, S, Merino-Ibarra, M, Sarma, SSS
Publicada:
1 ene 2008
Resumen:
Valle de Bravo is one of largest drinking water reservoirs in Mexico, serving nearly 12% of Mexico City's population of 26 million. We studied the monthly variations in the zooplankton density and diversity for one year (November 2004 to October 2005) at five different depths (2, 4, 8, 12, and 20 m) at each of the five sites of the reservoir. The water body was generally alkaline; pH decreased with increasing depth. Dissolved oxygen also decreased drastically with depth, from an average of 8 mg/L to less than 1 mg/L. Chlorophyll a concentration varied considerably (2.6 +/- 0.06 to 12.5 +/- 2.8 mu g/L) both seasonally and with depth. Secchi depth averaged 1.65 m and varied between 0.63 and 3.21 m along the seasons but exhibited minimal differences among sites. Differences in zooplankton abundance and composition were small among sites, supporting the theory that anthropogenic disturbances affect the reservoir as a whole. The mean total zooplankton density was about 400 +/- 293 ind./L, m
Filiaciones:
Nandini, S:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, UMF, Div Res & Postgrad Studies, Tlalnepantla 54090, State Of Mexico, Mexico
Merino-Ibarra, M:
Univ Nacl Autonoma Mexico, Inst Ciencias Mar & Limnol, Mexico City 04510, DF, Mexico
Sarma, SSS:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, UMF, Div Res & Postgrad Studies, Tlalnepantla 54090, State Of Mexico, Mexico
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