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Feeding And Absorption in Cerastoderma Eduee Under Environmental Conditions in the Bay of Marennesoleron (Western France)

Published online by Cambridge University Press:  11 May 2009

M.B. Urrutia
Affiliation:
Departamento de Biología Animal y Genética, Facultad de Ciencias, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Apartado 644, E–18080 Bilbao, Spain.
J.I.P. Iglesias
Affiliation:
Departamento de Biología Animal y Genética, Facultad de Ciencias, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Apartado 644, E–18080 Bilbao, Spain.
E. Navarro
Affiliation:
Departamento de Biología Animal y Genética, Facultad de Ciencias, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Apartado 644, E–18080 Bilbao, Spain.
J. Prou
Affiliation:
IFREMER, Station de La Tremblade, UREA, BP 133, F-17390 La Tremblade, France

Extract

Physiological processes involved in energy acquisition by the filter-feeding bivalve Cerastoderma edule (L.) (Mollusca: Bivalvia) were quantified under naturally fluctuating feeding conditions imposed by tidal cycles in the Bay of Marennes-Oleron. Physiological measurements were performed during two neap and two spring tidal cycles in order to cover a wide range of seston concentrations (TPM = 15–95 mg I-1). The main effect exerted by tides on the food supply was the resuspension of bottom sediments of low organic content, leading to a strong ‘dilution’ of suspended organic matter.

Although filtration rate was found to increase with seston concentration, ingestion rate was strictly regulated by means of pseudofaeces production. Selection efficiencies for chlorophyll a (SEchl), overall organic matter (SE0), carbon (SEC) and nitrogen (SEN) were estimated and related to dietary descriptors. The following ranking was found for the efficiency with which different substrates were selected: SEchl>SEN>SEo>SEc. Absorption efficiency was found to depend on the organic content of ingested matter according to an exponential saturating function. Observed differences between carbon and nitrogen absorption efficiency were not statistically significant. Absorption rate was kept fairly constant through the wide range of seston concentrations and qualities.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1996

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