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Density-dependent natural selection mediates harvest-induced trait changes

Résumé : Rapid life-history changes caused by size-selective harvesting are often interpreted as a response to direct harvest selection against a large body size. However, similar trait changes may result from a harvest-induced relaxation of natural selection for a large body size via density-dependent selection. Here, we show evidence of such density-dependent selection favouring large-bodied individuals at high population densities, in replicated pond populations of medaka fish. Harvesting, in contrast, selected medaka directly against large-bodied medaka and, in parallel, decreased medaka population densities. Five years of harvesting were enough for harvested and unharvested medaka populations to inherit the classically-predicted trait differences, whereby harvested medaka grew slower and matured earlier than unharvested medaka. We demonstrate that this life-history divergence was not driven by direct harvest selection for a smaller body size in harvested populations, but by density-dependent natural selection for a larger body size in unharvested populations.
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Preprints, Working Papers, ...
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https://hal.inrae.fr/hal-02958909
Contributor : Eric Edeline <>
Submitted on : Tuesday, October 6, 2020 - 12:48:47 PM
Last modification on : Wednesday, October 7, 2020 - 9:04:02 AM

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Distributed under a Creative Commons Attribution - NonCommercial 4.0 International License

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Alix Bouffet-Halle, Jacques Mériguet, David Carmignac, Simon Agostini, Alexis Millot, et al.. Density-dependent natural selection mediates harvest-induced trait changes. 2020. ⟨hal-02958909⟩

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