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Bergmann Rule Near the Equator - Latitudinal Clines in Body Size of an Andean Passerine Bird

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dc.contributor.author Graves, Gary R. en
dc.date.accessioned 2010-02-24T19:47:04Z
dc.date.available 2010-02-24T19:47:04Z
dc.date.issued 1991
dc.identifier.citation Graves, Gary R. 1991. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F8684">Bergmann Rule Near the Equator - Latitudinal Clines in Body Size of an Andean Passerine Bird</a>." <em>Proceedings of the National Academy of Sciences of the United States of America</em>. 88 (6):2322&ndash;2325. en
dc.identifier.issn 0027-8424
dc.identifier.uri http://hdl.handle.net/10088/8684
dc.description.abstract Critical correlative support for Bergmann&#39;s ecogeographic rule is provided by symmetrical patterns of size variation in Diglossa carbonaria, a tropical passerine bird whose geographic range in the Andes Mountains of South America straddles the equator. Body size is positively correlated with latitude both north and south of the equator. Moreover, parapatric taxa that exhibit either partial (northwestern Bolivia) or complete (northern Peru) reproductive isolation converge in body size. Relative uniformity in the length of the highly modified flower-piercing bill among populations of D. carbonaria that differ significantly in body size suggests that character displacement or interspecific competition is not responsible for these patterns. These findings support the hypothesis that climate, particularly temperature seasonality, is an important environmental determinant of geographic size variation in homeotherms. In addition they demonstrate that clinal variation correlated with subtle climatic gradients can occur in tropical environments. en
dc.relation.ispartof Proceedings of the National Academy of Sciences of the United States of America en
dc.title Bergmann Rule Near the Equator - Latitudinal Clines in Body Size of an Andean Passerine Bird en
dc.type Journal Article en
dc.identifier.srbnumber 75034
rft.jtitle Proceedings of the National Academy of Sciences of the United States of America
rft.volume 88
rft.issue 6
rft.spage 2322
rft.epage 2325
dc.description.SIUnit NMNH en
dc.description.SIUnit NH-Vertebrate Zoology en
dc.citation.spage 2322
dc.citation.epage 2325


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