Download e-book for iPad: Advances in Marine Biology, Vol. 10 by Frederick S. Russell, Maurice Yonge (Eds.)

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

ISBN-10: 0120261103

ISBN-13: 9780120261109

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Abundant calcareous species occurred down to about 4 000 m. Species groups occurred at 150 to 500, 1 200 to 2 800, and at 3 500 to 5 000 m respectively. A major contribution came from McKnight (1962) who reviewed previous work on Foraminifera in the Antarctic and presented very full quantitative data based on 28 surface core samples. From an analysis of his results he could find no correlation between distribution and depth, temperature, salinity, or mean grain size. Organic carbon seemed a possible controlling mechanism especially for arenaceous species.

Two species Hyperammina novaexealandiae Heron-Allen and Earland, and a species of Rhabdammina do extend into shallower depths but only occur in quantity from this zone down to about 2 200 m. At 1 300 m, the upper ANTAEUYTIC BENTHOS 35 limits of the depth range of Cyclammina orbicularis and Cribrostomoides subglobosum (Sam), and the upper limit of abundance of Glomospira icharoides is reached, and Karreriella puailla, Reophax spiculifer and Hemisphaerammina depressa (Heron-Allen and Earland) reach their lower limits.

Generic endemism is much less marked. Some 116 genera are known in the Antarctic. Of these only nine (Koltun, 1970) can be considered to be endemic, Scolymastra, Acanthorhabdus, Hoplakithara, Cercidochela, Meliidermu, Crellina, Bipocillopsis, Acanthoxa, and Cladothenea. g. Mycale, Asbestopluma, Myxilla, Tedania, Iophon, Hymedesmia, Isodictya, Anchinoe, Haliclona, Adocia, and Hymeniacidon. As in many other groups many sponges have a circum-Antarctic distribution. The commonest species in this group are : Rossella antarctica Carter, R .

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Advances in Marine Biology, Vol. 10 by Frederick S. Russell, Maurice Yonge (Eds.)

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