Get Advances in Marine Biology, Vol. 25 PDF

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

ISBN-10: 0120261251

ISBN-13: 9780120261253

Quantity 25 of this authoritative overview sequence maintains the excessive average set via the editors long ago. Marine biologists in every single place have come to price and luxuriate in the big variety of thought-provoking papers written via invited experts.In this quantity are studies of 4 animal teams which span the whole variety of the marine meals chain. The position of parasites in ecology is a transforming into curiosity and the parasites of zooplankton are defined intimately for the 1st time. facets of thegastropods, cephalopods and fish existence also are tested intimately.

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Extra resources for Advances in Marine Biology, Vol. 25

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Comm. Christensen, 1983 Hunter and Kimbrell, 1980 3-12 h 3. Predator response to prey density The numerical response of predators describes how the number (or size) of predators increases or declines in response to prey density (Solomon, 1949). Over a short time (from a few hours to days), predator populations may respond to high density patches of prey by aggregating locally through 32 K . M. BAILEY AND E. D . H ~ IDE A immigration. For example, Frank and Leggett (1984) noted that predatory winter flounder respond rapidly to capelin spawning by aggregating nearshore where capelin eggs are abundant.

Koslow et al. (1985) used such methods to show that Pleurobrachia pileus did not cause significant mortality of haddock eggs, and Fancett and Jenkins (1988) found similar results for two species of scyphozoans feeding on fish eggs in Port Phillip Bay, Australia. Finally, Monteleone and Duguay (1988) calculated from average population densities in a coastal area from Cape Hatteras to Cape Cod, US, and predator clearance rates from tank studies, that the ctenophore, Mnemiopsis leidyi could consume significant numbers of pelagic fish eggs.

Small larvae, such as yolk-sac stages of cod and flounder, usually showed no obvious escape response to contact with medusae, but appeared to be paralyzed. This contrasted with larger herring larvae which responded to 97% of contacts with medusae. Reactions by herring larvae to stings of medusae involve violent contortions and “backing-off’ (Blaxter and Batty, 1985), behaviors that are absent after contact with inert probes. Fuiman (1986) noted that successful evasion by zebrafish larvae of a predator is a function of timing (response latency and looming threshold), magnitude (distance and velocity) and direction of the escape attempt.

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

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