Age-dependent terminal declines in reproductive output in a wild bird.

In many iteroparous species individual fitness components, such as reproductive output, first increase with age and then decline during late-life. However, individuals differ greatly in reproductive lifespan, but reproductive declines may only occur in the period just before their death as a result...

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Autores principales:	Martijn Hammers, David S Richardson, Terry Burke, Jan Komdeur
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/823b93dc436142eb95d51d503ead6796
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spelling	oai:doaj.org-article:823b93dc436142eb95d51d503ead67962021-11-18T07:13:12ZAge-dependent terminal declines in reproductive output in a wild bird.1932-620310.1371/journal.pone.0040413https://doaj.org/article/823b93dc436142eb95d51d503ead67962012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22792307/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203In many iteroparous species individual fitness components, such as reproductive output, first increase with age and then decline during late-life. However, individuals differ greatly in reproductive lifespan, but reproductive declines may only occur in the period just before their death as a result of an age-independent decline in physiological condition. To fully understand reproductive senescence it is important to investigate to what extent declines in late-life reproduction can be explained by age, time until death, or both. However, the study of late-life fitness performance in natural populations is challenging as the exact birth and death dates of individuals are often not known, and most individuals succumb to extrinsic mortality before reaching old age. Here, we used an exceptional long-term longitudinal dataset of individuals from a natural, closed, and predator-free population of the Seychelles warbler (Acrocephalus sechellensis) to investigate reproductive output, both in relation to age and to the time until the death of an individual (reverse-age approach). We observed an initial age-dependent increase in reproductive output that was followed by a decline in old age. However, we found no significant decline in reproductive output in the years directly preceding death. Although post-peak reproductive output declined with age, this pattern differed between terminal and non-terminal reproductive attempts, and the age-dependence of the terminal breeding attempt explained much of the variation in age-specific reproductive output. In fact, terminal declines in reproductive output were steeper in very old individuals. These results indicate that not only age-dependent, but also age-independent factors, such as physiological condition, need to be considered to understand reproductive senescence in wild-living animals.Martijn HammersDavid S RichardsonTerry BurkeJan KomdeurPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 7, p e40413 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Martijn Hammers David S Richardson Terry Burke Jan Komdeur Age-dependent terminal declines in reproductive output in a wild bird.
description	In many iteroparous species individual fitness components, such as reproductive output, first increase with age and then decline during late-life. However, individuals differ greatly in reproductive lifespan, but reproductive declines may only occur in the period just before their death as a result of an age-independent decline in physiological condition. To fully understand reproductive senescence it is important to investigate to what extent declines in late-life reproduction can be explained by age, time until death, or both. However, the study of late-life fitness performance in natural populations is challenging as the exact birth and death dates of individuals are often not known, and most individuals succumb to extrinsic mortality before reaching old age. Here, we used an exceptional long-term longitudinal dataset of individuals from a natural, closed, and predator-free population of the Seychelles warbler (Acrocephalus sechellensis) to investigate reproductive output, both in relation to age and to the time until the death of an individual (reverse-age approach). We observed an initial age-dependent increase in reproductive output that was followed by a decline in old age. However, we found no significant decline in reproductive output in the years directly preceding death. Although post-peak reproductive output declined with age, this pattern differed between terminal and non-terminal reproductive attempts, and the age-dependence of the terminal breeding attempt explained much of the variation in age-specific reproductive output. In fact, terminal declines in reproductive output were steeper in very old individuals. These results indicate that not only age-dependent, but also age-independent factors, such as physiological condition, need to be considered to understand reproductive senescence in wild-living animals.
format	article
author	Martijn Hammers David S Richardson Terry Burke Jan Komdeur
author_facet	Martijn Hammers David S Richardson Terry Burke Jan Komdeur
author_sort	Martijn Hammers
title	Age-dependent terminal declines in reproductive output in a wild bird.
title_short	Age-dependent terminal declines in reproductive output in a wild bird.
title_full	Age-dependent terminal declines in reproductive output in a wild bird.
title_fullStr	Age-dependent terminal declines in reproductive output in a wild bird.
title_full_unstemmed	Age-dependent terminal declines in reproductive output in a wild bird.
title_sort	age-dependent terminal declines in reproductive output in a wild bird.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/823b93dc436142eb95d51d503ead6796
work_keys_str_mv	AT martijnhammers agedependentterminaldeclinesinreproductiveoutputinawildbird AT davidsrichardson agedependentterminaldeclinesinreproductiveoutputinawildbird AT terryburke agedependentterminaldeclinesinreproductiveoutputinawildbird AT jankomdeur agedependentterminaldeclinesinreproductiveoutputinawildbird
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Age-dependent terminal declines in reproductive output in a wild bird.

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