Read e-book online Advances in Marine Biology, Vol. 10 PDF

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

ISBN-10: 0120261103

ISBN-13: 9780120261109

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Extra info for Advances in Marine Biology, Vol. 10

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On the whole it is at about the level of Orders that occasional gaps appear in Antarctic checklists, although most of the noteworthy gaps are at the family level or slightly higher. Groups of animals which are well represented are those adapted to make use of the great summer bloom of phytoplankton. g. sponges, bryozoa, ascidians, gorgonian corals, hydroids, bivalves, cirripedes, sedentate polychaetes, ophiuroids and crinoids. Many of these are sedentary, anchored to the substrate, some are colonial.

Abyssal sponges of the southern oceans are as yet hardly known. About 30 species have been recorded belonging t o such genera as Caulophacus, Malacosaccus, Holascus, Aubcalyx, Hyalonema, Asbestopluma and Cladorhim. One of the characteristic Antarctic sponge families is the Rossellidae. It is a family of glass sponges, some members of which grow to great size. Normally found below 100 m, members of this family are found commonly on the shelf. It is the abundance of these forms in comparatively shallow water that gives a unique character to the benthos of the Antarctic.

Bandy and Echols (1964) analysed all the data previously collected on the Antarctic forms, including that presented by Uchio (1960) and McKnight (1962). A careful examination of these existing records gave the following zones for zonation of Antarctic benthic Foraminifera. 1. 200 (&150) m. aculeata group. 2. 500 (f 160) m. pusilla Brady group. 3. 1 000 (f200) m. 4. 2 000 (+200) m. 5. 2 400 (f600) m. Adercotryma glomerata (Brady)-Bulimina Cibicides wuellerstorfi (Schwagar)-Cyclammina Cyclammina orbicularis Brady group.

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

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