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The influence of the California marine layer on bill size in a generalist songbird

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dc.contributor.author Greenberg, Russell S. en
dc.contributor.author Danner, Raymond M. en
dc.date.accessioned 2013-02-28T20:11:05Z
dc.date.available 2013-02-28T20:11:05Z
dc.date.issued 2012
dc.identifier.citation Greenberg, Russell S. and Danner, Raymond M. 2012. "<a href="https://repository.si.edu/handle/10088/19570">The influence of the California marine layer on bill size in a generalist songbird</a>." <em>Evolution</em>. 66 (12):3825&ndash;3835. <a href="https://doi.org/10.1111/j.1558-5646.2012.01726.x">https://doi.org/10.1111/j.1558-5646.2012.01726.x</a> en
dc.identifier.issn 0014-3820
dc.identifier.uri http://hdl.handle.net/10088/19570
dc.description.abstract The hypothesis is tested that birds in hotter and drier environments may have larger bills to increase the surface area for heat dissipation. California provides a climatic gradient to test the influence of climate on bill size. Much of California experiences dry warm/hot summers and coastal areas experience cooler summers than interior localities. Based on measurements from 1488 museum skins, song sparrows showed increasing body-size-corrected bill surface area from the coast to the interior and declining in the far eastern desert. As predicted by Newton&#39;s convective heat transfer equation, relative bill size increased monotonically with temperature, and then decreased where average high temperatures exceed body temperature. Of the variables considered, distance from coast, average high summer temperature, and potential evapotranspiration showed a strong quadratic association with bill size and rainfall had a weaker negative relationship. Song sparrows on larger, warmer islands also had larger bills. A subsample of radiographed specimens showed that skeletal bill size is also correlated with temperature, demonstrating that bill size differences are not a result of variation in growth and wear of keratin. Combined with recent thermographic studies of heat loss in song sparrow bills, these results support the hypothesis that bill size in California song sparrows is selected for heat dissipation. en
dc.relation.ispartof Evolution en
dc.title The influence of the California marine layer on bill size in a generalist songbird en
dc.type Journal Article en
dc.identifier.srbnumber 112289
dc.identifier.doi 10.1111/j.1558-5646.2012.01726.x
rft.jtitle Evolution
rft.volume 66
rft.issue 12
rft.spage 3825
rft.epage 3835
dc.description.SIUnit NZP en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 3825
dc.citation.epage 3835

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