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Intrafamilial conflict and parental investment : a synthesis.

Parker, Geoff A. and Royle, Nick J. and Hartley, Ian R. (2002) Intrafamilial conflict and parental investment : a synthesis. Philosophical Transactions of the Royal Society of London Series B - Biological Sciences, 357 (1419). pp. 295-307. ISSN 0962-8436

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Abstract

We outline and develop current theory on how inherent genetic conflicts of interest between the various family members can affect the flow of parental investment from parents to offspring, and discuss the problems for empirical testing that this generates. The parental investment pattern realized in nature reflects the simultaneous resolution of all the conflicts between the family players. This depends on the genetic mechanism, the mating system and reproductive constraints, on whether extra demand by progeny affects current or future sibs, and particularly on the behavioural mechanisms underlying demand (begging or solicitation) and supply (provision of parental investment by parents). The direction of deviation from the optimal parental investment for the parent(s) depends on the slope of what we term the 'effect of supply on demand', the mechanism that determines how changes in food supply affect begging levels. If increasing food increases begging (positive slope), less parental investment is supplied than the parental optimum and if increasing food decreases begging (negative slope), more parental investment is supplied. The magnitude of deviation depends on both the 'effect of supply on demand' and on the 'effect of demand on supply' (the mechanism determining how changes in begging affect food supply, which always has a positive slope). We conclude that it will often be impossible to deduce the extent of underlying conflict by establishing the amount of parental investment given relative to the ideal optimum for the parent. Some possible directions for future research are discussed.

Item Type: Article
Journal or Publication Title: Philosophical Transactions of the Royal Society of London Series B - Biological Sciences
Uncontrolled Keywords: Evolutionarily Stable Strategy Begging Behaviour Parent-Offspring Conflict Parental Investment Sib Competition
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 9125
Deposited By: Dr Ian R Hartley
Deposited On: 28 May 2008 11:16
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9125

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