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Advances in Marine Biology, Vol. 15 by Frederick S. Russell (ed.), Maurice Yonge (ed.)

By Frederick S. Russell (ed.), Maurice Yonge (ed.)

Quantity 25 of this authoritative evaluate sequence keeps the excessive average set via the editors some time past. Marine biologists all over the place have come to worth and revel in the big variety of thought-provoking papers written by means of invited experts.In this quantity are studies of 4 animal teams which span the total variety of the marine meals chain. The function of parasites in ecology is a starting to be curiosity and the parasites of zooplankton are defined intimately for the 1st time. points of thegastropods, cephalopods and fish lifestyles also are tested intimately.

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Possibly this is a matter of definition. It is at times most abundant in the central region of the Black Sea (Afrikova, 1975). On a smaller scale, a number of authors have stated that Pseudocalanus is generally commoner away from the immediate vicinity of the coast. For example, Evans (1973) found that Pseudocalanus in 1969 was four times as common ten miles off the Northumberland coast as it was two miles offshore. However, Petipa et al. (1963) in a series of transects off the coast of the northern Black Sea found that regions of concentration varied, sometimes near shore and sometimes farther out.

MCLAREN Lee et al. b. (major non-volatile components) above the control concentration, had no measureable effect on zooplankton populations that were 44-91 % Pseudocalanus. Gibson and Grice (1977), again using large polyethylene enclosures in which Pseudocalanus was the predominant copepod, added concentrations of copper. 5-3 times faster than did controls. Reeve et aZ. (1977) studied rates of ingestion and production of faecal pellets by P~eudocaZ~n~s removed from these enclosures. Some depression in these rates when water samples from the enclosures were used was due to the reduction of food organisms by effects of enclosure or copper, so that rates determined on standard food (from outside the enclosures) give a more reliable indicator of effects of copper as a stress on the copepods.

The first antenna in the Calanoida never has more than 25 segments, and this number is frequently reduced by fusion of segments 1 and 2, 8 and 9 and more often 24 and 25 (Gurney, 1931). Griffiths and Frost (1976) illustrate the first antenna of male and female Pseudomlanus with the female first antenna possessing 23 free segments of which the first and second, eighth and ninth appear fused (Fig. 7B). The male first antenna has further fusions of segments especially at the base where there are well developed aesthetes (Fig.

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