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Titolo:
POTENTIAL ROLE OF FISH PREDATION AND NATURAL-POPULATIONS OF ZOOPLANKTON IN STRUCTURING A PLANKTON COMMUNITY IN EUTROPHIC LAKE WATER
Autore:
CHRISTOFFERSEN K; RIEMANN B; KLYSNER A; SONDERGAARD M;
Indirizzi:
UNIV COPENHAGEN,FRESHWATER BIOL LAB,51 HELSINGORSGADE DK-3400 HILLEROD DENMARK INT AGCY C14 DETERMINAT,INST WATER QUAL DK-2970 HORSHOLM DENMARK
Titolo Testata:
Limnology and oceanography
fascicolo: 3, volume: 38, anno: 1993,
pagine: 561 - 573
SICI:
0024-3590(1993)38:3<561:PROFPA>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRUSTACEAN ZOOPLANKTON; SECONDARY PRODUCTION; MICROBIAL LOOP; PHYTOPLANKTON; BIOMASS; BACTERIOPLANKTON; BACTERIA; FOOD; ROTIFERS; DAPHNIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
K. Christoffersen et al., "POTENTIAL ROLE OF FISH PREDATION AND NATURAL-POPULATIONS OF ZOOPLANKTON IN STRUCTURING A PLANKTON COMMUNITY IN EUTROPHIC LAKE WATER", Limnology and oceanography, 38(3), 1993, pp. 561-573

Abstract

During April to September, plankton community structure was monitoredin large enclosures (60 m3) in the presence and absence of planktivorous fish. Weekly sampling included inorganic nutrients, oxygen, pH, and transparency as well as biomass of phytoplankton, bacteria, heterotrophic flagellates, rotifers, and macrozooplankton. In fishless enclosures, concentrations of inorganic nutrients and transparency were higher than in enclosures with fish, whereas oxygen, pH, and biomasses of phytoplankton, picoplankton and rotifers were lower. As an average for the entire period, Ch1 a was 14 mug liter-1 in the enclosures without fish and 46 mug liter-1 in enclosures with fish. Macrozooplankton biomass was significantly lower in enclosures with fish than in enclosureswithout fish. Averaged over the entire period macrozooplankton biomass was 625 mug C liter-1 in enclosures with fish and 1, 149 mug C liter-1 in those without fish. Cladocerans dominated the macrozooplankton community in fishless enclosures and controlled the biomass of bacteriaand heterotrophic flagellates. The rotifer community was depressed inenclosures without fish, which probably was a combined effect of mechanical interference with Daphnia and food competition. The initial buildup of a high macrozooplankton biomass and the dominance of cladocerans in the enclosures without fish, prevented cyanobacteria from forming large colonies. In contrast, cyanobacteria (Microcystis, Aphanizomenon, and Anabaena) bloomed in the enclosures with fish. The observed changes in the plankton communities support the theory of cascading trophic interactions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/01/21 alle ore 22:29:21