INVESTIGADORES
IZAGUIRRE Irina
artículos
Título:
Phytoplankton communities in relation to trophic status in lakes from Hope Bay (Antarctic Peninsula).
Autor/es:
IZAGUIRRE, I., A. VINOCUR, G. MATALONI & M. POSE
Revista:
HYDROBIOLOGIA
Editorial:
Kluwer Academic Publishers
Referencias:
Año: 1998 vol. 369 p. 73 - 87
ISSN:
0018-8158
Resumen:
Nine lakes and ponds of Hope Bay (Antarctic Peninsula), with different trophic status were surveyed during four
summer periods between 1991 and 1996. Some limnological features and the structure of their algal assemblages
were strongly influenced by the eutrophication caused by seabirds
activity in their areas. Such differences among
lakes were evidenced by the results of Principal Component Analyses, based on both physicochemical
and
phytoplankton data. Oligotrophic lakes showed a scarce phytoplankton, commonly dominated by small flagellated
Chrysophyceae, and a well developed phytobenthos. Water bodies enriched by ornithogenic nutrients revealed an
abundant phytoplankton usually dominated by Chlorophyceae (Volvocales) and planktonic Cyanobacteria. A study
on one particular lake showed that summer changes in the phytoplankton community were mainly affected by
physical phenomena such as variation in light intensity, and thawing, mixing and freezing processes.