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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Jan 2011, 32 (1)                                     Back


nstantaneous and historical temperature effects on a-pinene

Temporal variation of phytoplankton from the tropical reservoir Valle de Bravo, Mexico

 

Author Details

 

Martha Leticia Gaytan-Herrera

Research and Postgraduate Division (UIICSE-CyMA Project), Universided Nacional Autonoma De

Mexico/FES-Iztacala, Avenida de los Barrios No. 1, 54090 Tlalnepantla, Estado de Mexico, Mexico

 

V?ctor Martinez-Almeida

Faculty of Science, Universided Nacional Autonoma De Mexico, Ciudad Universitaria, C.P. 04360

Maria Guadalupe Oliva-Martinez

Botanical Laboratory Universided Nacional Autonoma De Mexico/FES-Iztacala-UMF, C.P. 54090

?ngel Duran-Diaz

Biomathematics Department Universided Nacional Autonoma De Mexico/FES-Iztacala-School of Biology

Pedro Ramirez-Garcia

(Corresponding author)

Research and Postgraduate Division (UIICSE-CyMA Project), UNAM/FES-Iztacala, Avenida de los Barrios

No. 1, 54090 Tlalnepantla, Estado de Mexico, Mexico

e-mail: micro@servidor.unam.mx

 

 

 

Publication Data

Paper received:

15 June 2009

 

Revised received:

07 March 2010

 

Accepted:

20 April 2010

 

Abstract

Valle de Bravo reservoir is used for aquatic, fishing and as a source of drinking water to Mexico City. Annual data on composition, abundances, species richness and diversity of the phytoplankton surface community and some physical-chemical parameters variations were discussed. Results showed a spatial homogeneity for environmental descriptors and phytoplankton samples but a temporal significant difference between months. Pulses of high algal densities corresponded to late stratification (October, 103 x103 cell ml-1), early stratification (April, 107 x103 cell ml-1) and plenty stratification (June, 69 x103 cell ml-1). Taxa that reached higher densities were: Microcystis spp., Snowella septentrionalis, Anabaena spp., Aphanizomenon yezoense and Fragilaria crotonensis. Contribution of each taxon to the total phytoplankton density showed that majorities were rare (41%) or dominants (40%). Frequent alternation between pulses and low densities and diversity of phytoplankton as well as a relative high number of taxa found (68), could be explained by daily strong winds, unstable epilimnion thickness and incorporation and extraction of substantial volumes of water occurred in the reservoir. Dominances of cyanobacteria and some chlorococcal species and a high temporal fluctuated Shannon-Wiener diversity index (0.45- 2.35 bits) pointing to eutrophic and perturbed conditions.

 

Key words

Phytoplankton composition, Temporal variation, Tropical lakes-reservoirs, Valle de Bravo reservoir, Mexico

 

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