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Titolo:
Seasonal dynamics of the planktonic microbial community in a maritime Antarctic lake undergoing eutropication
Autore:
Butler, HG;
Indirizzi:
British Antarctic Survey, Cambridge CB3 0ET, England British Antarctic Survey Cambridge England CB3 0ET idge CB3 0ET, England
Titolo Testata:
JOURNAL OF PLANKTON RESEARCH
fascicolo: 12, volume: 21, anno: 1999,
pagine: 2393 - 2419
SICI:
0142-7873(199912)21:12<2393:SDOTPM>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRESH-WATER ECOSYSTEMS; CILIATED PROTOZOA; NAKED AMEBAS; SIGNY ISLAND; ANNUAL CYCLE; PHYTOPLANKTON; MARINE; PROTOZOOPLANKTON; ABUNDANCE; PATTERNS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
84
Recensione:
Indirizzi per estratti:
Indirizzo: Butler, HG British Antarctic Survey, Madingley Rd, Cambridge CB3 0ET, England British Antarctic Survey Madingley Rd Cambridge England CB3 0ET
Citazione:
H.G. Butler, "Seasonal dynamics of the planktonic microbial community in a maritime Antarctic lake undergoing eutropication", J PLANK RES, 21(12), 1999, pp. 2393-2419

Abstract

The abundance, biomass and community structure of phytoplankton, bacterioplankton and protozooplankton in a maritime Antarctic lake were determined at approximately monthly intervals from December 1994 to February 1996 and compared with data from earlier studies. Heywood Lake has become significantly eutrophic during the last three decades because of excreta from the expanding fur seal population in its catchment. Marked seasonal variations in the abundance, composition and productivity of biota were correlated with the seasonality of both physical factors and nutrient levels. Protozooplankton were abundant, diverse and usually dominated by heterotrophic nanoflagellates (HNF), with HNF abundance peaking at 2.35 X 10(7) 1(-1) in summer. High numbers of naked amoebae were sometimes present, reaching a maximum of 4.8 X 10(3) 1(-1) in March. An estimated 89 species of protozoa were observedduring the study, indicating substantially more diversity than is found incontinental Antarctic lakes. Diversity was highest in spring and lowest inwinter, when the entire water column became anoxic and the plankton were dominated by bacteria and a few species of relatively large anaerobic flagellates. The current status of the lake is compared with data for continentalAntarctic and lower latitude lakes. Earlier studies of biota and physical/chemical parameters in Heywood Lake are used to examine the effects of eutrophication over three decades. Observed changes include increased microbialabundance and changes in both community structure and seasonal patterns.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 21:38:44