Singh, P. orcid.org/0000-0002-8859-9593 and Best, A. (2023) A sterility–mortality tolerance trade-off leads to within-population variation in host tolerance. Bulletin of Mathematical Biology, 85 (3). 16. ISSN 0092-8240
Abstract
While experimental studies have demonstrated within-population variation in host tolerance to parasitism, theoretical studies rarely predict for polymorphism to arise. However, most theoretical models do not consider the crucial distinction between tolerance to the effects of infection-induced deaths (mortality tolerance) and tolerance to the parasite-induced reduction in the reproduction of infected hosts (sterility tolerance). While some studies have examined trade-offs between host tolerance and resistance mechanisms, none has considered a correlation within different tolerance mechanisms. We assume that sterility tolerance and mortality tolerance are directly traded-off in a host population subjected to a pathogen and use adaptive dynamics to study their evolutionary behaviour. We find that such a trade-off between the two tolerance strategies can drive the host population to branch into dimorphic strains, leading to coexistence of strains with sterile hosts that have low mortality and fully fertile with high mortality rates. Further, we find that a wider range of trade-off shapes allows branching at intermediate- or high-infected population size. Our other significant finding is that sterility tolerance is maximised (and mortality tolerance minimised) at an intermediate disease-induced mortality rate. Additionally, evolution entirely reverses the disease prevalence pattern corresponding to the recovery rate, compared to when no strategies evolve. We provide novel predictions on the evolutionary behaviour of two tolerance strategies concerning such a trade-off.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Author(s), under exclusive licence to Society for Mathematical Biology. This is an author-produced version of a paper subsequently published in Bulletin of Mathematical Biology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Host; Parasitism; Sterility tolerance; Trade-off; Fecundity; Branching |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 Jan 2023 10:42 |
Last Modified: | 20 Jan 2024 01:13 |
Status: | Published |
Publisher: | Springer Science and Business Media LLC |
Refereed: | Yes |
Identification Number: | 10.1007/s11538-023-01119-6 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:195543 |