Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/24610
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Inbreeding parents should invest more resources in fewer offspring
Authors: Duthie, A Bradley
Lee, Aline
Reid, Jane M
Contact Email: alexander.duthie@stir.ac.uk
Keywords: Inbreeding
inclusive fitness
mate choice
parental investment
relatedness
reproductive strategy
Issue Date: 30-Nov-2016
Citation: Duthie AB, Lee A & Reid JM (2016) Inbreeding parents should invest more resources in fewer offspring, Proceedings of the Royal Society B: Biological Sciences, 283 (1843), Art. No.: 20161845.
Abstract: Inbreeding increases parent-offspring relatedness and commonly reduces offspring viability, shaping selection on reproductive interactions involving relatives and associated parental investment (PI). Nevertheless, theories predicting selection for inbreeding versus inbreeding avoidance and selection for optimal PI have only been considered separately, precluding prediction of optimal PI and associated reproductive strategy given inbreeding. We unify inbreeding and PI theory, demonstrating that optimal PI increases when a female’s inbreeding decreases the viability of her offspring. Inbreeding females should therefore produce fewer offspring due to the fundamental trade-off between off-spring number and PI. Accordingly, selection for inbreeding versus inbreeding avoidance changes when females can adjust PI with the degree that they inbreed. In contrast, optimal PI does not depend on whether a focal female is herself inbred. However, inbreeding causes optimal PI to increase given strict monogamy and associated biparental investment compared to female-only investment. Our model implies that understanding evolutionary dynamics of inbreeding strategy, inbreeding depression, and PI requires joint consideration of the expression of each in relation to the other. Overall, we demonstrate that existing PI and inbreeding theories represent special cases of a more general theory, implying that intrinsic links between inbreeding and PI affect evolution of behaviour and intra-familial conflict.
DOI Link: http://dx.doi.org/10.1098/rspb.2016.1845
Rights: © 2016 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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