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Indirect evolution of social fitness inequalities and facultative social exploitation
Microbial genotypes with similarly high proficiency at a cooperative behaviour in genetically pure groups often exhibit fitness inequalities caused by social interaction in mixed groups. Winning competitors in this scenario have been referred to as ‘cheaters’ in some studies. Such interaction-specif...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5897644/ https://www.ncbi.nlm.nih.gov/pubmed/29593113 http://dx.doi.org/10.1098/rspb.2018.0054 |
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author | Nair, Ramith R. Fiegna, Francesca Velicer, Gregory J. |
author_facet | Nair, Ramith R. Fiegna, Francesca Velicer, Gregory J. |
author_sort | Nair, Ramith R. |
collection | PubMed |
description | Microbial genotypes with similarly high proficiency at a cooperative behaviour in genetically pure groups often exhibit fitness inequalities caused by social interaction in mixed groups. Winning competitors in this scenario have been referred to as ‘cheaters’ in some studies. Such interaction-specific fitness inequalities, as well as social exploitation (in which interaction between genotypes increases absolute fitness), might evolve due to selection for competitiveness at the focal behaviour or might arise non-adaptively due to pleiotropy, hitchhiking or genetic drift. The bacterium Myxococcus xanthus sporulates during cooperative development of multicellular fruiting bodies. Using M. xanthus lineages that underwent experimental evolution in allopatry without selection on sporulation, we demonstrate that interaction-specific fitness inequalities and facultative social exploitation during development readily evolved indirectly among descendant lineages. Fitness inequalities between evolved genotypes were not caused by divergence in developmental speed, as faster-developing strains were not over-represented among competition winners. In competitions between ancestors and several evolved strains, all evolved genotypes produced more spores than the ancestors, including losers of evolved-versus-evolved competitions, indicating that adaptation in non-developmental contexts pleiotropically increased competitiveness for spore production. Overall, our results suggest that fitness inequalities caused by social interaction during cooperative processes may often evolve non-adaptively in natural populations. |
format | Online Article Text |
id | pubmed-5897644 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | The Royal Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-58976442018-04-13 Indirect evolution of social fitness inequalities and facultative social exploitation Nair, Ramith R. Fiegna, Francesca Velicer, Gregory J. Proc Biol Sci Evolution Microbial genotypes with similarly high proficiency at a cooperative behaviour in genetically pure groups often exhibit fitness inequalities caused by social interaction in mixed groups. Winning competitors in this scenario have been referred to as ‘cheaters’ in some studies. Such interaction-specific fitness inequalities, as well as social exploitation (in which interaction between genotypes increases absolute fitness), might evolve due to selection for competitiveness at the focal behaviour or might arise non-adaptively due to pleiotropy, hitchhiking or genetic drift. The bacterium Myxococcus xanthus sporulates during cooperative development of multicellular fruiting bodies. Using M. xanthus lineages that underwent experimental evolution in allopatry without selection on sporulation, we demonstrate that interaction-specific fitness inequalities and facultative social exploitation during development readily evolved indirectly among descendant lineages. Fitness inequalities between evolved genotypes were not caused by divergence in developmental speed, as faster-developing strains were not over-represented among competition winners. In competitions between ancestors and several evolved strains, all evolved genotypes produced more spores than the ancestors, including losers of evolved-versus-evolved competitions, indicating that adaptation in non-developmental contexts pleiotropically increased competitiveness for spore production. Overall, our results suggest that fitness inequalities caused by social interaction during cooperative processes may often evolve non-adaptively in natural populations. The Royal Society 2018-03-28 2018-03-28 /pmc/articles/PMC5897644/ /pubmed/29593113 http://dx.doi.org/10.1098/rspb.2018.0054 Text en © 2018 The Authors. http://creativecommons.org/licenses/by/4.0/ 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. |
spellingShingle | Evolution Nair, Ramith R. Fiegna, Francesca Velicer, Gregory J. Indirect evolution of social fitness inequalities and facultative social exploitation |
title | Indirect evolution of social fitness inequalities and facultative social exploitation |
title_full | Indirect evolution of social fitness inequalities and facultative social exploitation |
title_fullStr | Indirect evolution of social fitness inequalities and facultative social exploitation |
title_full_unstemmed | Indirect evolution of social fitness inequalities and facultative social exploitation |
title_short | Indirect evolution of social fitness inequalities and facultative social exploitation |
title_sort | indirect evolution of social fitness inequalities and facultative social exploitation |
topic | Evolution |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5897644/ https://www.ncbi.nlm.nih.gov/pubmed/29593113 http://dx.doi.org/10.1098/rspb.2018.0054 |
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