Bivalve Filter Feeders: in Estuarine and Coastal Ecosystem by Brian L. Bayne (auth.), Richard F. Dame (eds.)

By Brian L. Bayne (auth.), Richard F. Dame (eds.)

Bivalve filter-feeding mollusks are very important parts of coastal ecosystems simply because they eliminate huge amounts of suspended fabric from the water and excrete plentiful quantities of reactive meals. those animals also are significant prey for various predators together with birds, fish, mammals, and invertebrates; moreover, they're major meals assets for people. whereas reports at the organismic and inhabitants point have ruled bivalve ecology, the new specialize in the environment roles of filter out feeding structures has ended in larger-scale investigations. With this process the categorical subject matters of body structure, grazing, predation, nutrient biking, actual atmosphere, machine simulation modeling, and environmental administration are mixed right into a significant whole.

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E. per unit of GPT) with rising quality. As an independent confirmation of this assumption, activity of digestive enzymes particularly carbohydrases- in the digestive gland of cockles have been found to increase in response to enhanced quality of the diet (Table III), while no such induction was apparent for carbohydrases of the crystalline style involved in extracellular digestion (Ibarrola, unpublished results). Since MFL represent the remaining of these digestive investments that are not reabsorbed, a positive dependence of these losses on food quality, as noticed in c.

81 1. 3 ........... J u. 1 0 2 4 6 8 10 Fig. 5. Metabolic fecal losses (MFL) per unit of organic ingestion, as a function of the total ingestion rate, at different food qualities (mg POM rom- 3 ) . In spite of having increased the rate of digestive investments, MFL per unit organic ingestion decrease with quality (Fig. 5), meaning that costs of digestion tend to decline in relative terms. Since MFL IOI represents the gap between gross and net efficiencies of absorption, this behavior 40 of MFL explains the remaining of the above referred qualitydependent increments in the energy absorbed per unit of ingested energy.

Mar Ecol Prog Ser 13: 47-53 Prins TC Smaal AC Pouwer AJ (1991) Selective ingestion of phytoplankton by the bivalves Mytilus edulis L. ). Hydrobiol Bull 25: 93-100 Purchon RD (1968) The Biology of the Mollusca. Pergamon Press Oxford England Smaal AC Verhagen JGH Coosen J Haas HA (1986) Interaction betwen seston quantity and quality and benthic suspension feeders in the Oosterschelde, The Netherlands. Ophelia 26: 385-399 Theisen BF (1977) Feeding rate of Mytilus edulis L. (Bivalvia) from different parts of Danish waters in water of different turbidity.

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