Data from selective harvests underestimate temporal trends in quantitative traits.

Biology Letters
Fanie PelletierJon T Jorgenson

Abstract

Human harvests can select against phenotypes favoured by natural selection, and natural resource managers should evaluate possible artificial selection on wild populations. Because the required genetic data are extremely difficult to gather, however, managers typically rely on harvested animals to document temporal trends. It is usually unknown whether these data are unbiased. We explore our ability to detect a decline in horn size of bighorn sheep (Ovis canadensis) by comparing harvested males with all males in a population where evolutionary changes owing to trophy hunting were previously reported. Hunting records underestimated the temporal decline, partly because of an increasing proportion of rams that could not be harvested because their horns were smaller than the threshold set by hunting regulations. If harvests are selective, temporal trends measured from harvest records will underestimate the magnitude of changes in wild populations.

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Citations

Aug 13, 2014·Proceedings of the National Academy of Sciences of the United States of America·Lochran W TraillTim Coulson
Dec 24, 2014·Ecology and Evolution·Fanie PelletierAnne Hubbs
Apr 22, 2016·Evolutionary Applications·Gabriel PigeonFanie Pelletier
Apr 21, 2018·The Journal of Animal Ecology·Ulf BüntgenKurt Bollmann
Nov 27, 2018·Royal Society Open Science·Maximilian L AllenTimothy R Van Deelen
Apr 5, 2016·Ecological Applications : a Publication of the Ecological Society of America·Mathieu DouhardChristophe Bonenfanti
Oct 22, 2015·Ecology and Evolution·Patrick I ChiyoDavid K Korir
Sep 25, 2019·Evolutionary Applications·Tayler N LaSharrKevin L Monteith

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