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Read e-book online Advances in Marine Biology, Vol. 15 PDF

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

ISBN-10: 0120261154

ISBN-13: 9780120261154

Quantity 25 of this authoritative overview sequence maintains the excessive usual set by means of the editors long ago. Marine biologists far and wide have come to worth and luxuriate in the wide range of thought-provoking papers written via invited experts.In this quantity are studies of 4 animal teams which span the whole diversity of the marine foodstuff chain. The function 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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From the side views of the female urosome of C V in Kraefft (1910) it seems clear to us that the border between thorax and abdomen lies between the first two urosome segments, which are swollen at this stage prior to fusion to form the genital segment in C VI. When young female stages of Pseudocalanus are parasitized, sometimes this fusion does not take place (see p. 194). D. Adults (C V I ) 1. Arrangement of somites and appendages into tagmata Within the arthropods somites are grouped into tagmata, such as head, thorax, and abdomen.

The elements of interest in excretion are nitrogen and phosphorus. 44 CHRISTOPHER J. CORKETT AND IAN A. MCLAREN A. Nitrogen Although amino acids and especially urea are produced by copepods, the current view (Conover, in press; Smith, 1975; Ikeda, 1974) is that NH, is the predominant form of excreted nitrogen by non-feeding copepods. Only NH, excretion has been measured in Pseudocalanus. Butler et al. (1969) and Ikeda (1974) have made a few measurements, but Christiansen (1968) has made extensive analyses of NH, excretion by Pseu,docaZanus from Bras d’Or Lake, a landlocked arm of the Atlantic in Nova Scotia.

By day 9, when populations in the enclosures had been severely depressed, these rates among animals exposed to 5 pg Cull were about half those of controls. I n these enclosures, there was a shift to smaller phytoplankton species. s (see p. 209) that this shift in phytoplankton size could have resulted because of depletion of their grazers, largely Pseudocalanus. G. Retrospects and prospects Although the overall distribution of Pseudocalanm is well documented, we lack knowledge of its precise southern limits in offshore waters in particular.

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

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