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 elements of coastal ecosystems simply because they eliminate huge amounts of suspended fabric from the water and excrete plentiful quantities of reactive nutrition. those animals also are significant prey for varied predators together with birds, fish, mammals, and invertebrates; in addition, they're major meals assets for people. whereas stories at the organismic and inhabitants point have ruled bivalve ecology, the new specialize in the surroundings roles of filter out feeding structures has ended in larger-scale investigations. With this procedure the categorical subject matters of body structure, grazing, predation, nutrient biking, actual surroundings, laptop simulation modeling, and environmental administration are mixed right into a significant whole.
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5: solid line). 75 log TPM x f fitted to experimental data by mUltiple regression analysis. 5. Lines were derived from a combination of the equation above (FR vs. 004 FT x f This expression was obtained after fitting data for cockles (Iglesias et al 1992 and own unpublished data) with a multiple regression model. (C) Ingestion rates (obtained as Filtration Rejection) as a function of seston concentration (mg TPM 1- 1 ) Pseudo feces production and rates of ingestion In the analysis of factors affecting pseudofeces production we have taken Ki0rboe et al (1980) approach expressing the rates of rejection as a linear function of the filtration rate.
Detritus). Newell and Jordan (1983) put forward this possibility to explain higher SE for the particulate N compared with C, in oysters. (b) If the amount of mucus secreted per unit of dry mass of pseudofeces produced were a constant, then the relative enrichment of rejected material with endogenous organics would rise with the decreasing quality of food, values (Iglesias et al leading to reduced SE 1992). Both these possibilities were tested in our laboratory by performing experiments where cockles were fed mixed suspensions of the algae Tetraselmis suecica and ashed (organic-free) silt in a range of 0 to 50 % organic content (Urrutia, unpublished results).
Consequently, functional relationships inherent in digestion and absorption will be considered first, posterior in order to provide a basis for the analysis of feeding behavior. 30 DIGESTIVE PROCESSES Factors limiting the energy uptake by the digestive system Absorption of nutrients across the gut wall represents energy gain from feeding and digestive processes standing out as the term to be optimized. Such energetic consideration strictly applies to the net rate of absorption, defined as the result from a balance between ingestion and defecation of organics.