New PDF release: Bivalve Filter Feeders: in Estuarine and Coastal Ecosystem

Nonfiction 8

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

ISBN-10: 3642783538

ISBN-13: 9783642783531

ISBN-10: 3642783554

ISBN-13: 9783642783555

Bivalve filter-feeding mollusks are vital elements 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; in addition, they're major foodstuff assets for people. whereas reviews at the organismic and inhabitants point have ruled bivalve ecology, the hot specialize in the surroundings roles of clear out feeding platforms has ended in larger-scale investigations. With this technique the explicit issues of body structure, grazing, predation, nutrient biking, actual setting, laptop simulation modeling, and environmental administration are mixed right into a significant whole.

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Additional info for Bivalve Filter Feeders: in Estuarine and Coastal Ecosystem Processes

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J Exp Mar Biol Ecol 148: 201-213 Goulletquer P Heral M Deslous-Paoli JM Prou J Razet D Boromthanarat W (1989) Ecophysiologie et bilan energetique de la palourde japonaise d elevage Ruditapes philippinarum. J Exp Mar Biol Ecol 132: 85-108 Grant J Bathman W Mills EL (1986) The interaction between benthic diatom films and sediment transport. Est Coast Shelf Sci 23: 225-238 Grant J Enright CT Griswold A (1990) Resuspension and growth of Ostrea edulis: a field experiment. Mar Biol 104: 51-59 Grant J Thorpe B (1991) Effects of suspended sediment on growth, respiration and excretion of the soft-shell clam (Mya arenaria).

In summary, at low rates of ingestion, increased quality of food result in an increment of AE that is essentially based on reducing endogenous losses per unit organic ingestion. As ingestion rises, however, maintenance of higher AE would turn to depend more on digestive adjustments leading to enlarged gut contents and associated longer permanence of food inside the digestive system. Quick enzyme induction (as reported for carbohydrases of the digestive gland) would constitute the particular expression of increasing digestive investments that may be required under these circumstances in order to guarantee "an efficient use of the effective gut capacity" (Willows, 1992).

On the other hand, hypothesis b may be tested by using Chl a contents instead of organic contents, in order to compute an index of SE that is not affected by mucous secretion (hollow circles, upper solid line in Fig. 7). The difference between the two solid lines represents the effect of an endogenous enrichment of pseudofeces with, mucus that, accordingly, could be estimated to constitute - 3 % of total dry mass of pseudofeces. Therefore, selection of phytoplankton within the pallial organs of cockles seems to occur with increasing efficiency as its abundance in the seston decreases, although under conditions resembling natural food availability characteristic of turbid environments, this feature appears obscured by both the presence of other forms of POM and the mucous losses associated with the rejection process.

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

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