Journal article
How to make an inclusive-fitness model
- Abstract:
- Social behaviours are typically modelled using neighbour-modulated fitness, which focuses on individuals having their fitness altered by neighbours. However, these models are either interpreted using inclusive fitness, which focuses on individuals altering the fitness of neighbours, or not interpreted at all. This disconnect leads to interpretational mistakes and obscures the adaptive significance of behaviour. We bridge this gap by presenting a systematic methodology for constructing inclusive-fitness models. We find a behaviour’s ‘inclusive-fitness effect’ by summing primary and secondary deviations in reproductive value. Primary deviations are the immediate result of a social interaction; for example, the cost and benefit of an altruistic act. Secondary deviations are compensatory effects that arise because the total reproductive value of the population is fixed; for example, the increased competition that follows an altruistic act. Compared to neighbour-modulated fitness methodologies, our approach is often simpler and reveals the model’s inclusive-fitness narrative clearly. We implement our methodology first in a homogeneous population, with supplementary examples of help under synergy, help in a viscous population and Creel’s paradox. We then implement our methodology in a class-structured population, where the advantages of our approach are most evident, with supplementary examples of altruism between age classes, and sex-ratio evolution.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Version of record, pdf, 462.8KB, Terms of use)
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- Publisher copy:
- 10.1098/rspb.2023.1310
Authors
- Publisher:
- The Royal Society
- Journal:
- Proceedings of the Royal Society B: Biological Sciences More from this journal
- Volume:
- 290
- Issue:
- 2008
- Article number:
- 20231310
- Publication date:
- 2023-10-04
- Acceptance date:
- 2023-09-05
- DOI:
- EISSN:
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1471-2954
- ISSN:
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0962-8452
- Language:
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English
- Keywords:
- Subjects:
- Pubs id:
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1514023
- Local pid:
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pubs:1514023
- Deposit date:
-
2023-08-20
- ARK identifier:
Terms of use
- Copyright holder:
- Scott and Wild
- Copyright date:
- 2023
- Rights statement:
- © 2023 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
- Licence:
- CC Attribution (CC BY)
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