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Interspecific associations between circulating antioxidant levels andl life-history variation in birds

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dc.contributor.author Cohen, Alan A. en
dc.contributor.author McGraw, Kevin J. en
dc.contributor.author Wiersma, Popko en
dc.contributor.author Williams, Joseph B. en
dc.contributor.author Robinson, W. Douglas en
dc.contributor.author Robinson, Tara R. en
dc.contributor.author Brawn, Jeffrey D. en
dc.contributor.author Ricklefs, Robert E. en
dc.date.accessioned 2011-02-09T20:02:04Z
dc.date.available 2011-02-09T20:02:04Z
dc.date.issued 2008
dc.identifier.citation Cohen, Alan A., McGraw, Kevin J., Wiersma, Popko, Williams, Joseph B., Robinson, W. Douglas, Robinson, Tara R., Brawn, Jeffrey D., and Ricklefs, Robert E. 2008. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F11820">Interspecific associations between circulating antioxidant levels andl life-history variation in birds</a>." <em>American Naturalist</em>. 172 (2):178&ndash;193. <a href="https://doi.org/10.1086/589456">https://doi.org/10.1086/589456</a> en
dc.identifier.issn 0003-0147
dc.identifier.uri http://hdl.handle.net/10088/11820
dc.description.abstract Antioxidants play an important role in protecting tissues against aging-associated oxidative damage and are thus prime candidates for relating physiological mechanisms to variation in life histories. We measured total antioxidant capacity, antioxidant response to stress, and levels of uric acid, vitamin E, and four carotenoids in 95 avian species, mostly passerines from Michigan or Panama. We compared antioxidant measures to seven variables related to life histories (clutch size, survival rate, incubation period, nestling period, basal metabolic rate, body mass, and whether the species lived in a tropical or temperate climate). Life-history-related traits varied over at least three statistically independent axes. Higher antioxidant levels were generally characteristic of more rapid development, lower survival rate, smaller body size, larger clutch size, and higher mass-adjusted metabolic rate, but the relationships of particular antioxidants with individual life-history traits showed considerable complexity. Antioxidant-life history associations differed between tropical and temperate species and varied with respect to taxonomic sampling. Vitamin E showed few relationships with life-history traits. Overall, our results partly support the hypothesis that antioxidant levels evolve to mirror free radical production. Clearly, however, the complex patterns of physiological diversification observed here result from the interplay of many factors, likely including not just investment in somatic maintenance but also phylogenetic constraint, diet, and other aspects of ecology. en
dc.relation.ispartof American Naturalist en
dc.title Interspecific associations between circulating antioxidant levels andl life-history variation in birds en
dc.type Journal Article en
dc.identifier.srbnumber 74243
dc.identifier.doi 10.1086/589456
rft.jtitle American Naturalist
rft.volume 172
rft.issue 2
rft.spage 178
rft.epage 193
dc.description.SIUnit Gamboa en
dc.description.SIUnit Central Panama en
dc.description.SIUnit NH-EOL en
dc.description.SIUnit Forces of Change en
dc.description.SIUnit STRI en
dc.citation.spage 178
dc.citation.epage 193

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