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The number of species and genera of Recent birds : a contribution to comparative systematics. American Museum novitates ; no. 2703

Show simple item record Bock, Walter Joseph, 1933- en_US Farrand, John. en_US 2005-10-06T18:18:10Z 2005-10-06T18:18:10Z 1980 en_US
dc.description 29 p. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 28-29). en_US
dc.description.abstract "Counts are presented for the numbers of species and genera of birds by orders and families to provide the data base for a comparative systematic analysis of the structure of the avian genus. These counts are based on the classification presented in the 'Reference list of birds of the world' and subsequent corrections. A total of 9021 species of birds exist in 2045 genera of which 3747 species in 941 genera are nonpasserine and 5274 species in 1104 genera are passerine. The species/genus ratio is calculated for each taxon with the average for all birds being 4.411 s/g. The distribution of genera of different size categories is tabulated for all birds and for selected subgroups. These distributions have the characteristic hollow-curve shape with a preponderance of small genera; 60.5 percent of all avian genera possess one or two species. The 39 largest genera are tabulated and analyzed; these comprise only 1.91 percent of all genera and contain 17.8 percent of all avian species or twice as many as in the one- and two-species genera. The possible reasons for the evolution of species-rich genera are outlined; the major ones are the ability of species in large genera to disperse and colonize new areas and the ability of these species to establish sympatry with congeneric species without divergence"--P. [1]. en_US
dc.format.extent 7168014 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. 2703 en_US
dc.subject.lcc QL1 .A436 no.2703, 1980 en_US
dc.subject.lcsh Birds -- Classification. en_US
dc.subject.lcsh Birds -- Speciation en_US
dc.title The number of species and genera of Recent birds : a contribution to comparative systematics. American Museum novitates ; no. 2703 en_US
dc.title.alternative Species and genera of Recent birds 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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