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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Temporary fragmentation of a marginal lake and its effects on zooplankton community structure and organization

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Author(s):
Nadai, R. [1] ; Henry, R. [1]
Total Authors: 2
Affiliation:
[1] UNESP, Inst Biosci, Dept Zool, BR-18618000 Botucatu, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Brazilian Journal of Biology; v. 69, n. 3, p. 819-835, AUG 2009.
Web of Science Citations: 7
Abstract

A river lateral lake (Coqueiral Lake marginal to Paranapanema River in its mouth zone into Jurumirim Reservoir, Sao Paulo, Brazil) presented fragmentation into four small isolated bodies of water during a prolonged drought period, disrupting the link with the river. The aim of this work was to compare the temporal modifications on zooplankton community structure (total abundance, species richness, and diversity) in the four water bodies. Zooplankton samplings and abiotic factor measurements were made in two periods - during isolation phase of the lake in relation to river and after re-establishment of hydrologic connectivity. A concentration effect on zooplankton abundance was recorded with drought progression, but without significant modifications in species richness and diversity. When the river inundation pulse occurred, a reduction in total zooplankton density was observed due to the dilution effect and a significant increase in species richness and diversity was recorded. Lateral water influx from the river to the lacustrine environment acts as a temporary disturbance factor on the zooplankton community structure. Zooplankton species composition presented some modifications between the two periods. Zooplankton organism drift in water from the river to the lake, removal of individuals from the aquatic macrophytes, and eclosion of resting eggs from sediment are probable factors that can increase zooplankton species richness immediately after lateral pulse inundation with water by the river. (AU)

FAPESP's process: 97/04999-8 - Biodiversity, structure of the communities and ecological processes in a river/lake ecotone zone: a study in the mouth region of the Paranapanema River into the Jurumirim Reservoir
Grantee:Raoul Henry
Support Opportunities: Research Projects - Thematic Grants