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Download e-book for iPad: Advances in Marine Biology, Vol. 15 by Frederick S. Russell (ed.), Maurice Yonge (ed.)

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

ISBN-10: 0120261154

ISBN-13: 9780120261154

Quantity 25 of this authoritative overview sequence maintains the excessive normal set by way of the editors some time past. Marine biologists far and wide have come to worth and revel in the wide range of thought-provoking papers written via invited experts.In this quantity are studies of 4 animal teams which span the complete variety of the marine nutrients chain. The position of parasites in ecology is a becoming 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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Additional resources for Advances in Marine Biology, Vol. 15

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4. C I I I It is not clear where the border between the thorax and abdomen lies (either at the main body articulation or between the first and second THE BIOLOQY OF PSEUDOCALANUS 31 urosome segment), but the latter is likely by analogy with C I , C 11, C V 9, and C VI. 6. C I V Sexual dimorphism appears at this stage. The fifth pair of swimming feet in the male is small and uniramous (Kraefft, 1910). The fourth metasome segment is the result of the fusion of the fourth and fifth thoracic segments, but this fusion is occasionally incomplete.

Then we consider inshore waters, where details of vertical distributions with respect to phydcal, chemical, and biological factors may be more evident than in the open sea. There is of course a dynamical aspect to this subject, which is dealt with at length elsewhere (Section XII). We refer throughout this section to daytime distributions of Pseudocalanus. The broad capabilities of Pseudocalanus are evident in vertical samples from deep, oceanic waters in various regions. I n the Norwegian Sea, most individuals occur above 50 m in spring, but below 1 000 m at other times of the year (Ostvedt, 1965).

The experiments discussed here deal largly with acute responses of Pseudocalanm to pollutants. Eriksson (1973a)has suggested that sex ratios of Pseudocalanus may be distorted in coastal waters by accelerated mortality of females. Steele and Frost (1977) have deduced from their simulation models that stresses like pollution may in general tend to favour small plant cells and therefore smaller copepods like Pseudocalanus. u~. ‘I ‘I IV. MORPHOLOGY Pseudocalanus is typical of most crustaceans in that after hatching at an early stage of development it adds successively new segments and appendages.

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


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