Open Collections

Blondel, Léa; Baillie, Lyndsey; Quinton, Jessica; Alemu, Jahson B.; Paterson, Ian; Hendry, Andrew P.; Bentzen, Paul

<b>Abstract</b><br/>In dendritic river systems, gene flow is expected to occur primarily within watersheds. Yet, rare cross‐watershed transfers can also occur, whether mediated by (often historical) geological events or (often contemporary) human activities. We explored these events and their potential evolutionary consequences by analyzing patterns of neutral genetic variation (microsatellites) and adaptive phenotypic variation (male color) in wild guppies (Poecilia reticulata) distributed across two watersheds in northern Trinidad. We found the expected signatures of within‐watershed gene flow; yet we also inferred at least two instances of cross‐watershed gene flow—one in the upstream reaches and one further downstream. The upstream cross‐watershed event appears to be very recent (41 ± 13 years), suggesting dispersal via recent flooding or undocumented human‐mediated transport. The downstream cross‐watershed event appears to be considerably older (577 ± 265 years), suggesting a role for rare geological or climatological events. Alongside these strong signatures of both contemporary and historical gene flow, we found little evidence of impacts on presumably adaptive phenotypic differentiation, except perhaps in the one instance of very recent cross‐watershed gene flow. Selection in this system seems to overpower gene flow—at least on the spatiotemporal scales investigated here.; <b>Usage notes</b><br /><div class="o-metadata__file-usage-entry"><h4 class="o-heading__level3-file-title">Genotypic and phenotypic data</h4><div class="o-metadata__file-description">This excel file contains phenotypic data (male color) and microsatellite genotypes (two datasets) from guppies located in the Marianne and Paria rivers, Trinidad.</div><div class="o-metadata__file-name">MS-gene-flow-data-dryad.xlsx</br></div></div>

Trinidad

Dryad version number: 1</p>

Version status: submitted</p>

Dryad curation status: Published</p>

Sharing link: https://datadryad.org/stash/share/4ODj6e2rp-DdvwLpIvrPreObTpkM-Y9z3m7mYws6S8w</p>

Storage size: 172821</p>

Visibility: public</p>

University of British Columbia Library

10.14288/1.0397675

https://doi.org/10.5683/SP2/EORIRC; https://doi.org/10.5061/dryad.5757d42

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