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Geographic ranges of North American birds. American Museum novitates ; no. 2785

Show simple item record Anderson, Sydney, 1927- en_US 2005-10-06T18:12:18Z 2005-10-06T18:12:18Z 1984 en_US
dc.description 17 p. : ill., maps ; 26 cm. en_US
dc.description Includes bibliographical references (p. 16-17). en_US
dc.description.abstract "The sizes of geographic ranges of North American birds form a 'hollow curve' frequency distribution with most species having relatively small ranges. In this they agree with mammals, but the average range-size (geometric mean of 2 x 10[superscript 6] km[superscript 2) is larger for birds; also the distribution is lognormal for birds but not for mammals. There are more species of birds than of mammals; 1370 species of North American birds and 842 of mammals conformed to the requirements of the analysis. Birds and mammals have similar patterns of general distribution such as roughly parallel latitudinal gradients in diversity and the hollow curve frequency distribution noted above. Because of these similarities and because birds have larger ranges, a larger percentage of the continent's avian species than of its mammalian species may be found in any one local area. Birds differ from mammals in greater prevalence of seasonal migration. However, more birds migrate short distances or not at all than longer distances. A larger percentage (50%) of North American avian species than of mammalian species (13%) occur also outside of North America. Present hypotheses relating sizes of geographic ranges to competition, diversity, age of taxa, eurytopy, niche width, vagility, latitude, abundance, sizes of individuals, and trophic levels are briefly noted. No hypothesis is very satisfactory. However, little attention has been devoted to studies describing or explaining patterns of frequency distributions of areas of different sizes in any group of organisms. The present paper describes the pattern for North American birds, compares them with mammals, and suggests some hypotheses for further testing"--P. [1]. en_US
dc.format.extent 2097300 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, N.Y. : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 2785 en_US
dc.subject.lcc QL1 .A436 no.2785, 1984 en_US
dc.subject.lcsh Birds -- North America -- Geographical distribution. en_US
dc.subject.lcsh Birds -- Home range -- North America. en_US
dc.subject.lcsh Home range (Animal geography) -- North America. en_US
dc.subject.lcsh Biogeography -- North America. en_US
dc.title Geographic ranges of North American birds. American Museum novitates ; no. 2785 en_US
dc.title.alternative North American bird ranges en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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