Animals

Antarctic Fish Biology. Evolution in a Unique Environment by Joseph T. Eastman

By Joseph T. Eastman

This crucial quantity offers an unique synthesis and novel evaluate of Antarctic fish biology, detailing the evolution of those fish in one of the most strange and severe environments on the earth. concentrating on one team of fish, the notothenoioids, which include the vast majority of the present organismal range, this ebook describes a fauna that has advanced in isolation and skilled great adaptive radiation via buying quite a few physiological specializations. Darwin's finches and African cichlids will be joined through Antarctic fishes as exemplars of adaptive radiation.
The books' insurance is specified and accomplished, and the writer essentially acknowledges the truth that those fish are an element of a finest and biologically special environment and setting. issues in Antarctic Fish Biology comprise previous and current environments, fossil documents, taxonomic composition of fauna, systematic relationships, diversification, and physiological diversifications

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Cenozoic Faunas 33 long, oxygen isotopie data indicate that surface water temperatures during the Paleocene were nearly 20°C. By late Eocene, water temperatures near Seymour Island had declined slowly to 10-15°C; however, marine life was still abundant and diverse. Plant and pollen fossils suggest that the late Eo­ cene climate on Seymour Island was similar to the modern cool temperate climates in Tasmania, New Zealand, and southern South America (Woodburne and Zinsmeister, 1984; Case, 1988). B.

5. Epibenthic fishes Epibenthic fishes (sometimes called engybenthic, engys meaning "near" in Greek) live just off the bottom, usually within a few meters of the substrate. In the case of notothenioids, they differ from benthic species in their stream­ lined appearance and lack of substrate contact adaptations. As typified by Trematomus loennbergii, they have large eyes and live at depths of 100-800 m, although they are most abundant at 400-600 m. Epibenthic fishes live in an ice-free habitat. 5 The Modern Fauna: Taxonomic Composition ä^Bij^^^fe^ I.

This province is intermediate in faunal composition betweeen East Antarctica and South Georgia (Andriashev, 1987). Lack of knowledge about the fishes of the Weddell Sea lead to uncertain­ ty about the boundary between the West and East Antarctic Provinces in this area of the continent. DeWitt (1971) predicted that many East Antarctic fishes would be found to have wide distributions. , 1984; Schwarzbach, 1988; Ekau, 1990). On the other side of the continent near the Ammundsen Sea, I. 2 Zoogeographie faunal units for fishes of the Antarctic Region as recognized by Andriashev (1987).

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