Alila, David O; Ten Brink, Hanna; Haesler, Marcel; Seehausen, Ole (2024). Ecological character displacement among Nothobranchius annual killifishes in Tanzania. Evolution, 78(4), pp. 679-689. Wiley 10.1093/evolut/qpae005
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Divergent ecological character displacement (ECD) is the competition-driven divergence in resource use-related phenotypic traits between coexisting species. It is considered one of the primary drivers of ecological diversification and adaptive radiation. We analyzed phenotypic and ecological variation in two African annual killifish species of the genus Nothobranchius; N. eggersi and N. melanospilus in sympatry and N. melanospilus in allopatry. Our aim was to test if allopatric and sympatric populations of N. melanospilus differ morphologically from each other and from N. eggersi, and examine if these differences are consistent with the predictions of ECD. We find that sympatric N. melanospilus differ from allopatric N. melanospilus and differ from N. eggersi more strongly than the latter. Our data satisfy four criteria for demonstrating ECD: Differences in phenotypes between allopatric and sympatric N. melanospilus are greater than expected by chance; the divergence pattern between allopatric and sympatric N. melanospilus results from an evolutionary shift rather than from ecological sorting; morphological differences observed reflect differences in resource use and, lastly, sites of allopatry and sympatry do not differ in food resource availability or other ecological conditions. Our results suggest that competition is the main driver of the observed divergence between two N. melanospilus populations.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology 08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) |
UniBE Contributor: |
Alila, Okinyi David, Häsler, Marcel, Seehausen, Ole |
Subjects: |
500 Science > 570 Life sciences; biology |
ISSN: |
1558-5646 |
Publisher: |
Wiley |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
22 Jan 2024 13:19 |
Last Modified: |
27 Mar 2024 00:14 |
Publisher DOI: |
10.1093/evolut/qpae005 |
PubMed ID: |
38241699 |
Uncontrolled Keywords: |
Ecological character displacement Interspecific competition Killifish Tanzania coexistence resource polymorphism |
BORIS DOI: |
10.48350/191937 |
URI: |
https://boris.unibe.ch/id/eprint/191937 |
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