Structure changes in a planktonic food web: biotic and abiotic controls

We examined the response of the plankton community to strong changes in the volume of oligotrophic Lake La Caldera through the ice-free period of 1995-1997. As consequence of the changes in the precipitation regime, the lake volume diminished to 2 m depth during the extremely dry year of 1995. The i...

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Bibliographic Details
Published in:Journal of limnology 1999-08, Vol.58 (2), p.213-222
Main Authors: MEDINA-SÁNCHEZ, Juan Manuel, VILLAR-ARGAIZ, Manuel, SÁNCHEZ-CASTILLO, Pedro, CRUZ-PIZARRO, Luis, CARRILLO, Presentación
Format: Article
Language:English
Subjects:
Algae
Bacteria
Chrysophyceae
food web, taxonomic structure, seasonal and interannual variations
Freshwater
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Summary:We examined the response of the plankton community to strong changes in the volume of oligotrophic Lake La Caldera through the ice-free period of 1995-1997. As consequence of the changes in the precipitation regime, the lake volume diminished to 2 m depth during the extremely dry year of 1995. The increase in phosphorus availability for this year caused the diversification of the planktonic community, and the autotrophic:heterotrophic (A/H) ratio was below 1. In spite of the sporadic dust loads associated to atmospheric events, the quick recovery of the lake volumen in 1996 led to a severe phosphorus limitation. Phytoplankton community was dominated by Chrysophyceae (>90% of abundance) and large zooplankters were very scarce (
ISSN:1129-5767
1723-8633
DOI:10.4081/jlimnol.1999.213