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Diving into divergence : Differentiation in swimming performances, physiology and gene expression between locally-adapted sympatric cichlid fishes

Diving into divergence : Differentiation in swimming performances, physiology and gene expression between locally-adapted sympatric cichlid fishes

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RAFFINI, Francesca, Ralf F. SCHNEIDER, Paolo FRANCHINI, Andreas F. KAUTT, Axel MEYER, 2020. Diving into divergence : Differentiation in swimming performances, physiology and gene expression between locally-adapted sympatric cichlid fishes. In: Molecular Ecology. Wiley. 29(7), pp. 1219-1234. ISSN 0962-1083. eISSN 1365-294X. Available under: doi: 10.1111/mec.15304

@article{Raffini2020-04Divin-47474, title={Diving into divergence : Differentiation in swimming performances, physiology and gene expression between locally-adapted sympatric cichlid fishes}, year={2020}, doi={10.1111/mec.15304}, number={7}, volume={29}, issn={0962-1083}, journal={Molecular Ecology}, pages={1219--1234}, author={Raffini, Francesca and Schneider, Ralf F. and Franchini, Paolo and Kautt, Andreas F. and Meyer, Axel} }

Schneider, Ralf F. 2019-11-13T09:51:20Z Schneider, Ralf F. Franchini, Paolo eng Raffini, Francesca 2020-04 Raffini, Francesca Diving into divergence : Differentiation in swimming performances, physiology and gene expression between locally-adapted sympatric cichlid fishes 2019-11-13T09:51:20Z Meyer, Axel Kautt, Andreas F. Meyer, Axel Sympatric speciation occurs without geographical barriers and is thought to often be driven by ecological specialization of individuals that eventually diverge genetically and phenotypically. Distinct morphologies between sympatric populations occupying different niches have been interpreted as such differentiating adaptive phenotypes, yet differences in performance and thus likely adaptiveness between them were rarely tested. Here, we investigated if divergent body shapes of two sympatric crater lake cichlid species from Nicaragua, one being a shore-associated (benthic) species while the other prefers the open water zones (limnetic), affect cruising (U<sub>crit</sub> ) and sprinting (U<sub>sprint</sub> ) swimming abilities - performances particularly relevant to their respective lifestyles. Furthermore, we investigated species differences in oxygen consumption (MO<sub>2</sub> ) across different swimming speeds and compare gene expression in gills and white muscle at rest and during exercise. We found a superior cruising ability in the limnetic Amphilophus zaliosus compared to the benthic A. astorquii, while sprinting was not different, suggesting that their distinct morphologies affect swimming performance. Increased cruising swimming ability in A. zaliosus was linked to a higher oxygen demand during activity (but not rest), indicating different metabolic rates during exercise - a hypothesis supported by coinciding gene expression patterns of gill transcriptomes. We identified differentially expressed genes linked to swimming physiology, regulation of swimming behaviour and oxygen intake. A combination of physiological and morphological differences may thus underlie adaptations to these species' distinct niches. This complex ecological specialization likely resulted in morphological and physiological trade-offs that contributed to the rapid establishment and maintenance of divergence with gene flow. terms-of-use Kautt, Andreas F. Franchini, Paolo

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