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Titolo:
Phytoplankton: a significant trophic source for soft corals?
Autore:
Widdig, A; Schlichter, D;
Indirizzi:
Univ Cologne, Inst Zool, D-50923 Cologne, Germany Univ Cologne Cologne Germany D-50923 Inst Zool, D-50923 Cologne, Germany
Titolo Testata:
HELGOLAND MARINE RESEARCH
fascicolo: 3, volume: 55, anno: 2001,
pagine: 198 - 211
SICI:
1438-387X(200108)55:3<198:PASTSF>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
GREAT-BARRIER-REEF; MARINE-PHYTOPLANKTON; SCLERACTINIAN CORALS; PARTICULATE MATTER; BIOMASS; NUTRITION; ZOOXANTHELLAE; ZOOPLANKTON; AUSTRALIA; DEPLETION;
Keywords:
carbon budget; C-14-labelled microalgae; Dendronephthya sp.; herbivory; soft coral;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Schlichter, D Univ Cologne, Inst Zool, Weyertal 119, D-50923 Cologne, Germany Univ Cologne Weyertal 119 Cologne Germany D-50923 , Germany
Citazione:
A. Widdig e D. Schlichter, "Phytoplankton: a significant trophic source for soft corals?", HELG MAR R, 55(3), 2001, pp. 198-211

Abstract

Histological autoradiographs and biochemical analyses show that C-14-labelled microalgae (diatoms, chlorophytes and dinoflagellates) are used by the soft coral Dendronephthya sp. Digestion of the algae took place at the point of exit of the pharynx into the coelenteron. Ingestion and assimilation of the labelled algae depended on incubation time, cell density, and to a lesser extent on species-specificity. C-14 incorporation into polysaccharides, proteins, lipids and compounds of low molecular weight was analysed. The C-14-labelling patterns of the four classes of substances varied depending on incubation time and cell density. C-14 incorporation was highest into lipids and proteins. Dissolved labelled algal metabolites, released during incubation into the medium, contributed between 4% and 25% to the total C-14 activity incorporated. The incorporated microalgae contributed a maximum of26% (average of the four species studied) to the daily organic carbon demand, as calculated from assimilation rates at natural eucaryotic phytoplankton densities and a 1 h incubation period. The calculated contribution to the daily organic carbon demand decreased after prolonged incubation periods to about 5% after 3 h and to 1-3% after 9 h. Thus the main energetic demandof Dendronephthya sp. has to be complemented by other components of the seston.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 14:25:01