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Robust sensory traits across light habitats: Visual signals but not receptors vary in centrarchids inhabiting distinct photic environments
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  • César Bertinetti,
  • Camille Mosley,
  • Stuart Jones,
  • Julián Torres-Dowdall
César Bertinetti
University of Notre Dame

Corresponding Author:cbertine@nd.edu

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Camille Mosley
University of Notre Dame
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Stuart Jones
University of Notre Dame
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Julián Torres-Dowdall
University of Notre Dame
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Abstract

Visual communication in fish is often shaped by the light environment they inhabit, which influences both sensory (e.g., eye size, opsin gene expression) and signaling traits (e.g., body reflectance). This study explores the phenotypic variation in the visual communication traits of six species of centrarchids (Centrarchidae) inhabiting two contrasting light environments. We measured morphological, molecular, and signaling traits to determine their variation across photic conditions. Our findings reveal significant interspecific variation in sensory traits but no consistent phenotypic variation between light environments. Centrarchids showed robust visual systems with red-green dichromatic vision, which was largely unaffected by different light habitats. We also found significant molecular evolution in the visual opsin genes, although these changes were not associated with environmental conditions. However, body reflectance displayed species-specific responses to environmental conditions, suggesting that signaling traits may be more flexible than sensory traits. Overall, our results challenge the generality of the current paradigm in visual ecology, which portrays visual systems in fish as highly tunable owing to photic conditions. Our study highlights the potential evolutionary or developmental constraints on centrarchid visual systems and their implications for adaptability to various habitats and novel environmental threats.
11 Oct 2024Submitted to Molecular Ecology
15 Oct 2024Submission Checks Completed
15 Oct 2024Assigned to Editor
15 Oct 2024Review(s) Completed, Editorial Evaluation Pending
20 Oct 2024Reviewer(s) Assigned