Juvenile mortality and sibling replacement: a kin selection approach.

IF 3.4 1区 生物学 Q2 EVOLUTIONARY BIOLOGY Evolution Letters Pub Date : 2024-05-06 eCollection Date: 2024-10-01 DOI:10.1093/evlett/qrae018
Stefano Giaimo, Arne Traulsen
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引用次数: 0

Abstract

Mortality generally is higher around birth and then progressively declines through the juvenile stage. In species where offspring depend upon their parents during maturation, a factor behind this mortality decline could be sibling replacement: offspring sacrifice their survival to benefit future or present siblings as early as possible in order to minimize losses in parental investment. Here, we propose a kin-selection model of sibling replacement. Theoretical analysis of the model and its application to demographic data of mammals suggest that sibling replacement consistently generates a selective incentive for increasing juvenile mortality at early ages when this mortality increment is the result of positive selection for juvenile altruism within the nuclear family. The model highlights how sibling replacement goes beyond optimal allocation of parental resources into dependents and can provoke greater mortality closer to birth also in response to a more favorable ratio of actors to recipients of altruism among siblings.

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来源期刊
Evolution Letters
Evolution Letters EVOLUTIONARY BIOLOGY-
CiteScore
13.00
自引率
2.00%
发文量
35
审稿时长
10 weeks
期刊介绍: Evolution Letters publishes cutting-edge new research in all areas of Evolutionary Biology. Available exclusively online, and entirely open access, Evolution Letters consists of Letters - original pieces of research which form the bulk of papers - and Comments and Opinion - a forum for highlighting timely new research ideas for the evolutionary community.
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