. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SCOPE FOR GROWTH OF SUSPENSION-FEEDING INVERTEBRATES 331 • 0 _ GRL Controls ... ARTControls 1989 Weight (g) • o GRL Controls — GRL to ARP 234 1989 Weight (g) • o _ _ ARP Controls — ARP to GRL. M. senile (Fig. 2a). Higher growth efficiencies (K2) in ARP anemones are the result, not only of higher consumption and assimilation, but also of the lower respiration rates observed in these anemones. The high flow regime at ARP would be expected to result in higher, flow-modulated metabolic rates (Patterson, 1992). Anemones reciproca
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SCOPE FOR GROWTH OF SUSPENSION-FEEDING INVERTEBRATES 331 • 0 _ GRL Controls ... ARTControls 1989 Weight (g) • o GRL Controls — GRL to ARP 234 1989 Weight (g) • o _ _ ARP Controls — ARP to GRL. M. senile (Fig. 2a). Higher growth efficiencies (K2) in ARP anemones are the result, not only of higher consumption and assimilation, but also of the lower respiration rates observed in these anemones. The high flow regime at ARP would be expected to result in higher, flow-modulated metabolic rates (Patterson, 1992). Anemones reciprocally transplanted between ARP and GRL for one year exhibit an incomplete compensatory response, with respiration rates staying nearly the same as the control rates (Lesser, unpub.). This suggests either a genetic component con- straining the phenotypic response of respiration rates be- tween sites or an irreversible nongenetic adaptation (Za- mer and Mangum, 1979). Anemones at ARP were found in large groups at high densities during the time of this study, and all of the field observations confirmed that anemones were fully expanded and not collapsing on the downstream side of the ambient flow. This could have been the result of the effects of neighbors on the flow regime or of the material properties of the anemones themselves. The issue of local selection of specific geno- types due to flow regime for low rates of respiration or enhanced materials properties remains to be assessed. The effect of flow per se. or seston flux, on bivalve feed- ing and subsequent growth is poorly understood (Grizzle and Lutz, 1988). Within the range of flows measured at ARP and GRL at 30-35 m (Table I) nonsiphonate bivalve molluscs generally show a negative effect of increasing water flow on filtration or clearance rate (Cahalan et ai, 1989; Wildish et 1987; Grizzle et ai. 1992). Flow- induced inhibition of feeding cannot be ruled out for M. modiolus at ARP. In a recent study on Myti
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
