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  Senescence and costs of reproduction in the life history of a small precocial species

Trillmich, F., Geißler, E., & Guenther, A. (2019). Senescence and costs of reproduction in the life history of a small precocial species. Ecology and Evolution, 9(12), 7069-7079. doi:10.1002/ece3.5272.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-4700-C Version Permalink: http://hdl.handle.net/21.11116/0000-0004-4706-6
Genre: Journal Article

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Trillmich_et_al-2019-Ecology_and_Evolution.pdf (Publisher version), 794KB
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 Creators:
Trillmich, Fritz, Author
Geißler, Edda, Author
Guenther, Anja1, Author              
Affiliations:
1Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635              

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Free keywords: postnatal development and mortality, reproductive effort, reproductive seasonality, reproductive senescence, trade-off
 Abstract: Species following a fast life history are expected to express fitness costs mainly as increased mortality, while slow-lived species should suffer fertility costs. Because observational studies have limited power to disentangle intrinsic and extrinsic factors influencing senescence, we manipulated reproductive effort experimentally in the cavy (Cavia aperea) which produces extremely precocial young. We created two experimental groups: One was allowed continuous reproduction (CR) and the other intermittent reproduction (IR) by removing males at regular intervals. We predicted that the CR females should senesce (and die) earlier and produce either fewer and/or smaller, slower growing offspring per litter than those of the IR group. CR females had 16% more litters during three years than IR females. CR females increased mass and body condition more steeply and both remained higher until the experiment ended. Female survival showed no group difference. Reproductive senescence in litter size, litter mass, and reproductive effort (litter mass/maternal mass) began after about 600 days and was slightly stronger in CR than IR females. Litter size, litter mass, and offspring survival declined with maternal age and were influenced by seasonality. IR females decreased reproductive effort less during cold seasons and only at higher age than CR females. Nevertheless, offspring winter mortality was higher in IR females. Our results show small costs of reproduction despite high reproductive effort, suggesting that under ad libitum food conditions costs depend largely on internal regulation of allocation decisions. © 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

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Language(s): eng - English
 Dates: 2019-05-012019-02-062019-05-022019-05-292019-06
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/ece3.5272
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Title: Ecology and Evolution
Source Genre: Journal
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Publ. Info: John Wiley & Sons, Inc.
Pages: - Volume / Issue: 9 (12) Sequence Number: - Start / End Page: 7069 - 7079 Identifier: ISSN: 2045-7758
CoNE: https://pure.mpg.de/cone/journals/resource/2045-7758