Linked Life Data

11295518

Source:http://linkedlifedata.com/resource/pubmed/id/11295518

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4-6
pubmed:dateCreated
2001-4-11
pubmed:abstractText
We use the Weibull model to characterize initial (extrinsic) mortality rates (m(0)) and rate of increase in mortality with age (omega) for natural and captive populations of birds and mammals. Weibull parameters can be estimated for small samples of ages at death by constructing survival curves and fitting the Weibull model by nonlinear least-squares regression. Both m(0) and omega decrease in captivity, on average, and omega bears a strong relationship to m(0), as it does in nature, irrespective of body mass or differences between birds and mammals. Rate of aging is most closely related to brain size in birds and to rate of postnatal growth in mammals. It is not related to duration of embryonic development, body size independently of brain size, or genome size. We suggest that causes of extrinsic mortality in nature may be replaced in captivity by intrinsically controlled causes of mortality related to processes that regulate the rate of aging.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0531-5565
pubmed:author
pubmed:issnType
Print
pubmed:volume
36
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
845-57
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Comparison of aging-related mortality among birds and mammals.
pubmed:affiliation
Department of Biology, University of Missouri - St Louis, 8001 Natural Bridge Road, St Louis, MO 63121-4499, USA. ricklefs@umsl.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.