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Do large seston particles contribute to the diet of the bivalve Cerastoderma edule?

Journal article
Authors Örjan Karlsson
Per R. Jonsson
Ann I. Larsson
Published in Marine Ecology-Progress Series
Volume 261
Pages 161-173
ISSN 0171-8630
Publication year 2003
Published at Department of Marine Ecology, Tjärnö Marine Biological Laboratory
Department of Marine Ecology
Pages 161-173
Language en
Links <Go to ISI>://000186704400013
Keywords suspension-feeding, large particles, flow, bed roughness, cerastoderma edule, suspension-feeding bivalves, mytilus-edulis, seasonal-variation, grazing impact, mussel pump, growth, phytoplankton, behavior, bed, flow
Subject categories Biological Sciences, Ecology

Abstract

`The vertical distribution of suspended cellulose particles in the size range 60 to 500 mum was studied with artificial bivalve siphons in flume flow for a range of flow speeds and degrees of bed roughness. Significant vertical concentration gradients with an increase in particle concentration of 200 to 300% compared with their near-bed values were found for some combinations of flow speed and particle size in a 6 cm layer above the bed, which was an effect of flow velocity. In a second series of experiments, artificial siphons were replaced by the infaunal bivalve Cerastoderma edule (L.), and filtration was studied for large particles (60 to 500 mum). Corresponding experiments in a static system were also performed. C. edule readily ingested particles up to a maximum size of ca. 500 mum, and calculations of clearance for sizes between 60 and 300 mum were in the range of 0.5 to 3 1 h(-1) g(-1) dry weight, which is close to rates measured for microflagellates. Field studies on large particles in the near-bed layer (0 to 10 cm) show that this fraction contributes significantly to total seston. It is concluded that large particles like plant detritus, benthic diatoms and invertebrate larvae may accumulate in the near-bed layer and form a significant food source for benthic bivalves.

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