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Titolo:
Phytoplankton structure and dynamics in a turbid Antarctic Lake (Potter Peninsula, King George Island)
Autore:
Unrein, F; Vinocur, A;
Indirizzi:
Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ciencias Biol, RA-1428Buenos Aires, DF, Argentina Univ Buenos Aires Buenos Aires DF Argentina RA-1428 Aires, DF, Argentina
Titolo Testata:
POLAR BIOLOGY
fascicolo: 2, volume: 22, anno: 1999,
pagine: 93 - 101
SICI:
0722-4060(199908)22:2<93:PSADIA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRESH-WATER ECOSYSTEMS; HOPE-BAY; EPILITHIC ALGAE; SIGNY ISLAND; PICOPLANKTON; STREAM; PRODUCTIVITY; ASSEMBLAGES; CRUSTACEA; CHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Unrein, F Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ciencias Biol, Ciudad Univ,Pab 2, RA-1428 Buenos Aires, DF, Argentina Univ Buenos AiresCiudad Univ,Pab 2 Buenos Aires DF Argentina RA-1428
Citazione:
F. Unrein e A. Vinocur, "Phytoplankton structure and dynamics in a turbid Antarctic Lake (Potter Peninsula, King George Island)", POLAR BIOL, 22(2), 1999, pp. 93-101

Abstract

Qualitative and quantitative changes in the freshwater phytoplankton from one of the largest lakes in Potter Peninsula were studied during the summerperiod of 1995/1996. The main limnological features were analysed. This research constitutes the first study dealing with the phytoplankton structureand dynamics from lakes in Potter Peninsula. Due to the mixing of the water column by the constant wind action during the ice-free period, neither physical, chemical nor biological parameters showed differences between depths. Soluble reactive phosphorus remained low (26 mu g l(-1)) while total phosphorus concentrations were up to 232 mu g l(-1). Suspended solids and total phosphorus differed significantly between the two basins in which the lake is divided. Sixty-five taxa were identified. The Bacillariophyceae was the dominant class followed by Chrysophyceae. Achnanthes lanceolata var. haynaldii and Hydrurus foetidus (cysts) were the dominant species. Tychoplanktonic species were the best represented in terms of abundance and species richness. The principal component analysis carried out with abiotic variables showed a temporal gradient characterised by the augmentation of suspended solids, total phosphorus, conductivity, pH and NH4-N to the end of the summer period. The Principal Component Analysis performed with biotic variables also showed a temporal trend related to a decline in phytoplankton density and an enhancement of chlorophyll-a despite a slight increase of light limitation during the study period. This inverse relation may be due to the presence of picoplankton in chlorophyll-a samples. The potential effect of grazing on the phytoplankton structure is a subject to be tested in future studies.

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Documento generato il 19/01/20 alle ore 14:33:01