Sex-specific additive genetic variances and correlations for fitness in a song sparrow (Melospiza melodia) population subject to natural immigration and inbreeding.

Autor: Wolak ME; School of Biological Sciences, University of Aberdeen, Aberdeen, Scotland.; Department of Biological Sciences, Auburn University, Auburn, Alabama 36849., Arcese P; Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada., Keller LF; Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.; Zoological Museum, University of Zurich, Karl-Schmid-Strasse 4, CH-8006 Zurich, Switzerland., Nietlisbach P; Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada., Reid JM; School of Biological Sciences, University of Aberdeen, Aberdeen, Scotland.
Jazyk: angličtina
Zdroj: Evolution; international journal of organic evolution [Evolution] 2018 Oct; Vol. 72 (10), pp. 2057-2075. Date of Electronic Publication: 2018 Sep 24.
DOI: 10.1111/evo.13575
Abstrakt: Quantifying sex-specific additive genetic variance (V A ) in fitness, and the cross-sex genetic correlation (r A ), is prerequisite to predicting evolutionary dynamics and the magnitude of sexual conflict. Further, quantifying V A and r A in underlying fitness components, and genetic consequences of immigration and resulting gene flow, is required to identify mechanisms that maintain V A in fitness. However, these key parameters have rarely been estimated in wild populations experiencing natural environmental variation and immigration. We used comprehensive pedigree and life-history data from song sparrows (Melospiza melodia) to estimate V A and r A in sex-specific fitness and underlying fitness components, and to estimate additive genetic effects of immigrants alongside inbreeding depression. We found evidence of substantial V A in female and male fitness, with a moderate positive cross-sex r A . There was also substantial V A in male but not female adult reproductive success, and moderate V A in juvenile survival but not adult annual survival. Immigrants introduced alleles with negative additive genetic effects on local fitness, potentially reducing population mean fitness through migration load, but alleviating expression of inbreeding depression. Our results show that V A for fitness can be maintained in the wild, and be broadly concordant between the sexes despite marked sex-specific V A in reproductive success.
(© 2018 The Author(s). Evolution published by Wiley Periodicals, Inc. on behalf of The Society for the Study of Evolution.)
Databáze: MEDLINE
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