Aquatic Sciences Meeting, Albuquerque 2001

PC17 Phytoplankton Physiology and Ecology

Date: Thursday, February 15, 2001

Location: Southwest Hall

Escalante, A, H, NATIONAL UNIVERSITY OF MAR DEL PLATA, MAR DEL PLATA, Argentina, aescalan@mdp.edu.ar

Parada, V, , NATIONAL UNIVERSITY OF MAR DEL PLATA, MAR DEL PLATA, Argentina, vparada23@yahoo.com

Solari, L, C, INSTITUTE OF LIMNOLOGY DR. R.A. RINGUELET, FLORENCIO VARELA, Argentina, solari@ilpla.edu.ar

PHYTOPLANKTON COMMUNITY FROM A PAMPASIC POND IN SOUTHERN SOUTH AMERICA

Phytoplankton from Los Padres pond was sampled monthly between November 1997 and October 1998 in 3 different sites to study the community structure and dynamics. Station 1: mid-lake; St. 2: affluent creek inlet and St. 3: effluent creek outlet. Chrysophytes constituted the dominant group. The highest species richness towards creeks (maximum at St. 2) could be explained by those algae which, even though collected in plankton, live attached to macrophytes. Nygaard index decreased from St. 2, through mid-lake up to St. 3, showing a kind of autodepuration towards effluent outlet. St. 2 appeared to be significatively different from St. 1 and St. 3, as biological, physical and chemical conditions concerns. Phytoplankton temporal pattern resulted in diatom replacement by cyanophytes mainly, where theoretical succesion: chlorophytes – diatoms – cyanophytes never occurred. Predominance of continuous mixing and shallowness, as well as climatic disturbances over autogenic factors would explain the development of repetitive and consecutive reversions.

This Session Listing

Aquatic Sciences Meeting, Albuquerque 2001

Quicklinks