Repeated Divergence in Opsin Genes Expression Mirrors Photic Habitat Changes in Rapidly Evolving Crater Lake Cichlid Fishes

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2024
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Comparative genomics of parallel in repeated adaptive radiations (GenAdap)
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The American Naturalist. University of Chicago Press. 2024, 203(5), pp. 604-617. ISSN 0003-0147. eISSN 1537-5323. Available under: doi: 10.1086/729420
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Selection pressures differ along environmental gradients and traits tightly linked to fitness (e.g., the visual system) are expected to track such variation. Along gradients, adaptation to local conditions might be due to heritable and non-heritable, environmentally induced variation. Disentangling these sources of phenotypic variation requires studying closely related populations in nature and the laboratory. The Nicaraguan lakes represent an environmental gradient in photic conditions from clear crater lakes to very turbid great lakes. From two old, turbid great lakes, Midas cichlid fish (Amphilophus cf. citrinellus) independently colonized seven isolated crater lakes of varying light conditions, resulting in a small adaptive radiation. We estimated visual sensitivities variation along this photic gradient by measuring cone opsin gene expression among lake populations. Visual sensitivities observed in all seven derived crater lake populations shifted predictably in direction and magnitude, repeatedly mirroring changes in photic conditions. Comparing wild-caught and laboratory-reared fish revealed that 48% of this phenotypic variation is genetically determined and evolved rapidly. Decreasing intrapopulation variation as environments become spectrally narrower suggests that different selective landscapes operate along the gradient. We conclude that the power to predict phenotypic evolution along gradients depends on both the magnitude of environmental change and the selective landscape shape.

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570 Biowissenschaften, Biologie
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local adaptation, phenotypic evolution, environmental gradient, sensory ecology, visual sensitivity
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ISO 690BERTINETTI CERRATO, Cesar, Andreas HÄRER, Nidal KARAGIC, Axel MEYER, Julián TORRES-DOWDALL, 2024. Repeated Divergence in Opsin Genes Expression Mirrors Photic Habitat Changes in Rapidly Evolving Crater Lake Cichlid Fishes. In: The American Naturalist. University of Chicago Press. 2024, 203(5), pp. 604-617. ISSN 0003-0147. eISSN 1537-5323. Available under: doi: 10.1086/729420
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@article{BertinettiCerrato2024-05-01Repea-69364,
  year={2024},
  doi={10.1086/729420},
  title={Repeated Divergence in Opsin Genes Expression Mirrors Photic Habitat Changes in Rapidly Evolving Crater Lake Cichlid Fishes},
  number={5},
  volume={203},
  issn={0003-0147},
  journal={The American Naturalist},
  pages={604--617},
  author={Bertinetti Cerrato, Cesar and Härer, Andreas and Karagic, Nidal and Meyer, Axel and Torres-Dowdall, Julián}
}
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