The effect of bottleneck size on evolution in nested Darwinian populations.

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dc.contributor.authorNitschke, M.C.
dc.contributor.authorBlack, A.J.
dc.contributor.authorBourrat, P.
dc.contributor.authorRainey, P.B.
dc.date.issued2023
dc.description.abstractPrevious work has shown how a minimal ecological structure consisting of patchily distributed resources and recurrent dispersal between patches can scaffold Darwinian properties onto collections of cells. When the timescale of dispersal is long compared with the time to consume resources, patch fitness increases but comes at a cost to cell growth rates. This creates conditions that initiate evolutionary transitions in individuality. A key feature of the scaffold is a bottleneck created during dispersal, causing patches to be founded by single cells. The bottleneck decreases competition within patches and, hence, creates a strong hereditary link at the level of patches. Here, we construct a fully stochastic model to investigate the effect of bottleneck size on the evolutionary dynamics of both cells and collectives. We show that larger bottlenecks simply slow the dynamics, but, at some point, which depends on the parameters of the within-patch model, the direction of evolution towards the equilibrium reverses. Introduction of random fluctuations in bottleneck sizes with some positive probability of smaller sizes counteracts this, even when the probability of smaller bottlenecks is minimal.
dc.description.statementofresponsibilityMatthew C. Nitschke, Andrew J. Black, Pierrick Bourrat, Paul B. Rainey
dc.identifier.citationJournal of Theoretical Biology, 2023; 561:111414-1-111414-12
dc.identifier.doi10.1016/j.jtbi.2023.111414
dc.identifier.issn0022-5193
dc.identifier.issn1095-8541
dc.identifier.orcidBlack, A.J. [0000-0003-3299-4866]
dc.identifier.urihttps://hdl.handle.net/2440/137880
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/DE160100690
dc.relation.granthttp://purl.org/au-research/grants/arc/DE210100303
dc.rights© 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
dc.source.urihttps://doi.org/10.1016/j.jtbi.2023.111414
dc.subjectEcological scaffolding
dc.subjectEvolutionary transition in individuality
dc.subjectMajor transition
dc.subjectStochastic model
dc.subject.meshProbability
dc.subject.meshPopulation Dynamics
dc.subject.meshBiological Evolution
dc.titleThe effect of bottleneck size on evolution in nested Darwinian populations.
dc.typeJournal article
pubs.publication-statusPublished

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