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

By Joseph T. Eastman

This significant quantity presents an unique synthesis and novel evaluation of Antarctic fish biology, detailing the evolution of those fish in essentially the most strange and severe environments on the planet. targeting one workforce of fish, the notothenoioids, which comprise nearly all of the present organismal variety, this booklet describes a fauna that has advanced in isolation and skilled really good adaptive radiation by means of buying a variety of physiological specializations. Darwin's finches and African cichlids should be joined through Antarctic fishes as exemplars of adaptive radiation.
The books' assurance is certain and accomplished, and the writer truly acknowledges the truth that those fish are an element of a best and biologically special environment and atmosphere. subject matters in Antarctic Fish Biology comprise previous and current environments, fossil documents, taxonomic composition of fauna, systematic relationships, diversification, and physiological variations

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7) to modify Nybelin's system. He recognized these groups: (1) near-shore (sublit­ toral) species, (2) near shore (sublittoral) onto continental shelf species, (3) continental shelf and upper continental slope species, and (4) continental slope (bathyal) and abyssal species. DeWitt notes that groups two and three contain the most species and that they overlap broadly on the continental shelves. Furthermore, habitat preferences for fishes are evident within group two; species from near-shore collections are almost never represented in collections from farther out on the shelf.

From Eastman (1991b) with permission of Springer-Verlag. Ma 248 PERIOD ERA TV. Cenozoic Faunas 31 C. Late Cretaceous Seymour and James Ross Islands, near the tip of the Antarctic Peninsula, are the only known localities for late Cretaceous (98-65 Ma) fishes in Antarctica. The late Cretaceous climate at this location was warm temperate with marked seasons (Elliot, 1985). Most material consists of elasmobranch teeth (Fig. 3E-F) and undetermined vertebral centra. , and Grande and Chatterjee (1987) and Cione and Medina (1987) reported hexanchiform sharks.

Recently the Antarctic fossil record for other taxa has contributed addi­ tional support for the concept of heterochroneity. Late Cretaceous/early Tertiary Antarctic groups with descendants that subsequently dispersed to lower latitudes include some taxa of plants (Askin, 1989; Dettmann, 1989), lobsters (Feldmann and Tshudy, 1989), amphipods (Wading and Thurston, 1989), and marsupials (Case, 1989). The known fossil record for teleosts in Antarctica does not supplement the argument for heterochroneity—it is simply too incomplete for any con­ clusions to be drawn.

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