Seasonal changes in the rotifer (Rotifera) diversity from a tropical high altitude reservoir (Valle de Bravo, Mexico)
Por:
Contreras, JJ, Sarma, SSS, Merino-Ibarra, M, Nandini, S
Publicada:
1 mar 2009
Resumen:
We studied the zooplankton community composition at different depths (2, 4, 8,12 and 20 m) of Valle de Bravo, a drinking water reservoir in central Mexico during December 2005 to November 2006. Temperature, dissolved oxygen, pH and chlorophyll a were measured simultaneously. While physicochemical values were similar to those found in previous studies, total zooplankton abundance was higher (mean 84 7 ind. l(-1)), doubling the mean abundance found in the previous year Nevertheless, Zooplankton remained dominated by the rotifer genera Keratella, Polyarthra and Trichocerca, which constituted nearly 80% of the total numerical abundances. We encountered 23 rotifer species of which 5 of them (Lepadella rhomboides, Cephalodelle catellina, Trichocerca elongate, T porcellus and Dicranophorus forcipatus) were recorded for the first time from this reservoir. Shannon Wiener diversity index showed that the annual mean species diversity index was similar at depths of 2, 4 and 8 m, but were reduced a
Filiaciones:
Contreras, JJ:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, Div Res & Postgrad Studies, Los Reyes 54090, Tlalnepantla St, Mexico
Sarma, SSS:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, Div Res & Postgrad Studies, Los Reyes 54090, Tlalnepantla St, Mexico
Merino-Ibarra, M:
Univ Nacl Autonoma Mexico, Inst Ciencias Mar & Limnol, Mexico City 04510, DF, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, Div Res & Postgrad Studies, Los Reyes 54090, Tlalnepantla St, Mexico
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