Senescence and sexual selection in a pelagic copepod.

The ecology of senescence in marine zooplankton is not well known. Here we demonstrate senescence effects in the marine copepod Oithona davisae and show how sex and sexual selection accelerate the rate of ageing in the males. We show that adult mortality increases and male mating capacity and female...

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Autores principales:	Sara Ceballos, Thomas Kiørboe
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f1404a7a12b44e289d4b5a77159920d4
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spelling	oai:doaj.org-article:f1404a7a12b44e289d4b5a77159920d42021-11-18T06:55:46ZSenescence and sexual selection in a pelagic copepod.1932-620310.1371/journal.pone.0018870https://doaj.org/article/f1404a7a12b44e289d4b5a77159920d42011-04-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21533149/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203The ecology of senescence in marine zooplankton is not well known. Here we demonstrate senescence effects in the marine copepod Oithona davisae and show how sex and sexual selection accelerate the rate of ageing in the males. We show that adult mortality increases and male mating capacity and female fertility decrease with age and that the deterioration in reproductive performance is faster for males. Males have a limited mating capacity because they can fertilize < 2 females day(-1) and their reproductive life span is 10 days on average. High female encounter rates in nature (>10 day(-1)), a rapid age-dependent decline in female fertility, and a high mortality cost of mating in males are conducive to the development of male choosiness. In our experiments males in fact show a preference for mating with young females that are 3 times more fertile than 30-day old females. We argue that this may lead to severe male-male competition for young virgin females and a trade-off that favours investment in mate finding over maintenance. In nature, mate finding leads to a further elevated mortality of males, because these swim rapidly in their search for attractive partners, further relaxing fitness benefits of maintenance investments. We show that females have a short reproductive period compared to their average longevity but virgin females stay fertile for most of their life. We interpret this as an adaptation to a shortage of males, because a long life increases the chance of fertilization and/or of finding a high quality partner. The very long post reproductive life that many females experience is thus a secondary effect of such an adaptation.Sara CeballosThomas KiørboePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 4, p e18870 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sara Ceballos Thomas Kiørboe Senescence and sexual selection in a pelagic copepod.
description	The ecology of senescence in marine zooplankton is not well known. Here we demonstrate senescence effects in the marine copepod Oithona davisae and show how sex and sexual selection accelerate the rate of ageing in the males. We show that adult mortality increases and male mating capacity and female fertility decrease with age and that the deterioration in reproductive performance is faster for males. Males have a limited mating capacity because they can fertilize < 2 females day(-1) and their reproductive life span is 10 days on average. High female encounter rates in nature (>10 day(-1)), a rapid age-dependent decline in female fertility, and a high mortality cost of mating in males are conducive to the development of male choosiness. In our experiments males in fact show a preference for mating with young females that are 3 times more fertile than 30-day old females. We argue that this may lead to severe male-male competition for young virgin females and a trade-off that favours investment in mate finding over maintenance. In nature, mate finding leads to a further elevated mortality of males, because these swim rapidly in their search for attractive partners, further relaxing fitness benefits of maintenance investments. We show that females have a short reproductive period compared to their average longevity but virgin females stay fertile for most of their life. We interpret this as an adaptation to a shortage of males, because a long life increases the chance of fertilization and/or of finding a high quality partner. The very long post reproductive life that many females experience is thus a secondary effect of such an adaptation.
format	article
author	Sara Ceballos Thomas Kiørboe
author_facet	Sara Ceballos Thomas Kiørboe
author_sort	Sara Ceballos
title	Senescence and sexual selection in a pelagic copepod.
title_short	Senescence and sexual selection in a pelagic copepod.
title_full	Senescence and sexual selection in a pelagic copepod.
title_fullStr	Senescence and sexual selection in a pelagic copepod.
title_full_unstemmed	Senescence and sexual selection in a pelagic copepod.
title_sort	senescence and sexual selection in a pelagic copepod.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/f1404a7a12b44e289d4b5a77159920d4
work_keys_str_mv	AT saraceballos senescenceandsexualselectioninapelagiccopepod AT thomaskiørboe senescenceandsexualselectioninapelagiccopepod
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Senescence and sexual selection in a pelagic copepod.

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