Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity.

Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity. Research Abstract Details 

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Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity. Abstract Text:

We examined the relationship between number of offspring produced to a certain age and subsequent longevity in captive zoo populations of 18 species of mammal and 12 species of bird. The age cut-offs in each analysis were set to include 50%, 75% and 90% of the offspring produced in each of the population samples. Only one of 68 regressions was significant, and its slope was positive. In addition, we examined the relationship between age at first reproduction up to a certain age and longevity after that age, generally 5 years (3-8), among 17 species of mammal and 12 species of bird. Only one of these regressions had a significantly positive slope, indicating that early reproduction rarely reduces lifespan. Overall, we found no evidence that producing offspring in a zoo environment influences the age at death. Thus, although trade-offs might apply in natural populations under resource limitation, neither pregnancy, growth of the foetus and lactation in mammals, nor egg production in birds, reduces lifespan in the absence of such stress. If genetically based or other intrinsic antagonistic pleiotropy underlies the evolution of senescence, it was not evident in our analyses.

Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity. Publishing Authors By Initials

For similar reproductive and urinary physiology: reproduction research abstracts see: reproductive and urinary physiology: reproduction research

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Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Ecology letters

VOLUME: 10

Page Numbers: 867-72

Journal Abbreviation: Ecol. Lett.

ISSN: 1461-0248

DAY: 3

MONTH: Oct

YEAR: 2007

Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity. Information

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LANGUAGE: eng

NlmUniqueID: 101121949

Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity. Keywords Mesh Terms:

KEYWORDS: Reproduction

MESH TERMS: physiology

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Grant and Affiliation Information for Lifespan is unrelated to investment in reproduction in populations of mammals and birds in captivity.

AFFILIATION: Department of Biology, University of Missouri-St Louis, 8001 Natural Bridge Road, St Louis, MO 63121-4499, USA. ricklefs@umsl.edu

Country: England

AGENCY: United States NIA

GRANT: R01 AG20263-01

ACRONYM: AG

MEDLINETA: Ecol Lett

REFSOURCE: Ecol Lett. 2007 Oct;10(10):872-4; discus

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