Download PDF by J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.): Advances in Marine Biology, Vol. 19

By J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.)

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

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Sample text

Phoronis harmeri is locally abundant, up to 28 000 individuals/m2 particularly in fine sandy bottoms. The highest density in a P . harmeri population, about 68 OOCk93 000 individuals/m2, was established by Ollivier et al. (1977, Fig. 79) in spring 1972, but the population suffered high mortality by heavy predation (60000adults/m2 by June). In some Californian areas, Ph>oronopsisharmeri shows a uniform distribution over the littoral region of the flats, slightly less dense on the upper and lower edges of the intertidal zone where the sediment is coarser.

Rnuefferi / P 1 0 V Fu;. 29. (a) Diagram of a possible relationship between the different species living in soft substrate and the sediment particles and the organic matter based on our prevent knowledge of the distribution of Phoronida (modified, after Thomassin and Emig, 1980);(11) distribution of the phoronid species in relation t o the depth (after Emig. 1979, completed). , 1977) this species has been collected in silty and muddy sand from 2 to 25 m, abundant in locations from here to 15 m.

29). The only cited density gives 37-70 individuals/m2 (Thomassin and Emig, 1980). _ 0 C ! rnuefferi / P 1 0 V Fu;. 29. (a) Diagram of a possible relationship between the different species living in soft substrate and the sediment particles and the organic matter based on our prevent knowledge of the distribution of Phoronida (modified, after Thomassin and Emig, 1980);(11) distribution of the phoronid species in relation t o the depth (after Emig. 1979, completed). , 1977) this species has been collected in silty and muddy sand from 2 to 25 m, abundant in locations from here to 15 m.

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