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Advances in Marine Biology, Vol. 25 by J.H.S. Blaxter (ed.), A.J. Southward (ed.)

By J.H.S. Blaxter (ed.), A.J. Southward (ed.)

Quantity 25 of this authoritative evaluate sequence maintains the excessive ordinary set through the editors long ago. Marine biologists in every single place have come to worth and luxuriate in the big variety of thought-provoking papers written through invited experts.In this quantity are stories of 4 animal teams which span the complete variety of the marine nutrients chain. The function of parasites in ecology is a becoming curiosity and the parasites of zooplankton are defined intimately for the 1st time. features of thegastropods, cephalopods and fish existence also are tested intimately.

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BAILEY A N D E. D. , 1985). japonica diet. 2% in April. japonica and degree of overlap of the two organisms. The high predation estimate in April may be exaggerated because the abundance of sand eel larvae was underestimated. In April many larvae were large enough to avoid the 1 m ring-net samplers but apparently were still vulnerable to amphipod predation. Brewer et al. (1984) reported incidences of predation upon eggs and larvae by zooplankton.

HOUDE contents; a= rate (/h) of gastric evacuation; t= h/d that a fish feeds. Elliott and Persson’s equation has not been applied to predation upon fish eggs and larvae, but Dwyer et al. (1987) have used this model to calculate consumption of 0-group juvenile walleye pollock (Theragra chalcogramma) by adult pollock. The Elliott and Persson’s model generally requires rigorous sampling intervals of 1-3 h. Boisclair and Leggett (1988) compared the Elliott and Persson and the relatively simpler Eggers’ model in an in situ experiment and found that the two models were comparable in magnitude and accuracy of daily ration estimates for adult yellow perch (Perca Javescens).

For several predator species, larval escape ability always increased with larval size. Folkvord and Hunter observed that the smaller the predator, the faster larval escape ability improves with increasing size (Fig. 8). Anchovy larvae longer than 20 mm responded more frequently to northern anchovy attacks than to Pacific mackerel attacks because mackerel attacked at higher speeds. At higher attack speeds, larvae are less responsive because there is less time to react. Generally, larvae responded less frequently to large predators than to small ones because attack speed increased with predator size.

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