891 resultados para biogeographical pattern


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The 78 bryozoan species collected by the German R/V "Polarstern" during the LAMPOS cruise in April 2002, encompassing the Scotia Arc archipelagos between Tierra del Fuego and the Antarctic Peninsula, were studied to discern the biogeographical patterns of the Magellan region of South America, the Scotia Arc archipelagos and the Antarctic. The resulting dendrogram shows three clusters: an isolated one with the three easternmost archipelagos and the other two linking some of the northern and southern Scotia Arc archipelagos with Tierra del Fuego. A more comprehensive analysis using all the species previously recorded from the Scotia Arc archipelagos and adjacent areas (214 spp.) produced a clearer zoogeographical pattern without isolated clusters of localities. The Antarctic Peninsula plus the Scotia Arc archipelagos form a large cluster distinct from the Magellan-Falkland Subantarctic area. A third analysis making use of 78 genera present in the study area plus Australia and New Zealand reinforces this pattern, showing two clusters: one uniting South America and the Australian-New Zealand realm and the other linking the Scotia Arc archipelagos with the Antarctic Peninsula. These results indicate that the Scotia Arc archipelagos represent merely a very narrow bridge connecting two different bryozoan faunas with only a few bryozoan species in common between the study areas.

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Includes bibliographical references.

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National Bureau of Standards, Tire Systems Section, Washington, D.C.

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Mode of access: Internet.

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"August 31, 1962."

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Printout.

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"Supported in part by Contract AT(11-1) 1018 with the U.S. Atomic Energy Commission and the Advanced Research Projects Agency."

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Supported in part by Contract AT(11-1)-1018 with the U.S. Atomic Energy Commission .

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"This work was supported in part by Contract No. AT(11-1)-1018 of the Atomic Energy Commission. This report supercedes File No. 513."

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"Presented at the 18th Annual ACM National Conference, Denver, Colorado August 27, 1963"

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Supported by: Contract AT (11-1)-1018 with the U.S. Atomic Energy Commission and the Advanced Research Projects Agency.