Male eastern bluebirds trade future ornamentation for current reproductive investment.

Male eastern bluebirds trade future ornamentation for current reproductive investment. Research Abstract Details 

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Male eastern bluebirds trade future ornamentation for current reproductive investment. Abstract Text:

Lynn Siefferman,Geoffrey E Hill,

Life-history theory proposes that organisms must trade-off investment in current and future reproduction. Production of ornamental display is an important component of reproductive effort that has rarely been considered in tests of allocation trade-offs. Male eastern bluebirds (Sialia sialis) display brilliant ultraviolet-blue plumage that is correlated with mate acquisition and male competitive ability. To investigate trade-offs between current reproductive effort and the future expression of a sexually selected ornament, we manipulated the parental effort of males by changing their brood sizes. We found that parents provisioned experimentally enlarged broods more often than reduced broods. As predicted by life-history theory, the change in parental effort had a significant effect on the relative plumage ornamentation of males in the subsequent year: males with reduced broods significantly increased in plumage brightness. Moreover, this change in plumage coloration had a direct effect on the timing of breeding in the following season: males that displayed brighter plumage in the year following the manipulation mated with females that initiated egg laying earlier in the season. These data indicate that male bluebirds must trade-off conserving energy for production of future ornamentation versus expending energy for current reproduction.

Male eastern bluebirds trade future ornamentation for current reproductive investment. Publishing Authors By Initials

L Siefferman,GE Hill,

For similar animals: chordata: vertebrates: birds: passeriformes: songbirds research abstracts see: animals: chordata: vertebrates: birds: passeriformes: songbirds research

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Male eastern bluebirds trade future ornamentation for current reproductive investment. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Biology letters

VOLUME: 1

Page Numbers: 208-11

Journal Abbreviation: Biol. Lett.

ISSN: 1744-9561

DAY: 22

MONTH: Jun

YEAR: 2005

Male eastern bluebirds trade future ornamentation for current reproductive investment. Information

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LANGUAGE: eng

NlmUniqueID: 101247722

Male eastern bluebirds trade future ornamentation for current reproductive investment. Keywords Mesh Terms:

KEYWORDS: Songbirds

MESH TERMS: physiology

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Grant and Affiliation Information for Male eastern bluebirds trade future ornamentation for current reproductive investment.

AFFILIATION: Department of Biological Sciences, Auburn University, Auburn, AL 36849, USA. siefflm@auburn.edu

Country: England

AGENCY: United States NIAID

GRANT: R01 AI49724

ACRONYM: AI

MEDLINETA: Biol Lett

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