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Effective population sizes and adaptive genetic variation in a captive bird population

Giridhar Athrey, Nikolas Faust, Anne-Sophie Charlotte Hieke, I. Lehr Brisbin
doi: https://doi.org/10.1101/307728
Giridhar Athrey
1Department of Poultry Science, Texas A&M University, 2472 TAMU, College Station, TX, 77843
2Faculty of Ecology and Evolutionary Biology, Texas A&M University, 2472 TAMU, College Station, TX, 77843
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  • For correspondence: giri.athrey@tamu.edu
Nikolas Faust
1Department of Poultry Science, Texas A&M University, 2472 TAMU, College Station, TX, 77843
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Anne-Sophie Charlotte Hieke
1Department of Poultry Science, Texas A&M University, 2472 TAMU, College Station, TX, 77843
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I. Lehr Brisbin
3University of Georgia/Savannah River Ecology Lab, Drawer E, Aiken, SC, 29802
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Abstract

Captive populations are considered a key component of ex situ conservation programs. Research on multiple taxa have shown the differential success of maintaining demographic versus genetic stability and viability in captive populations. In typical captive populations, usually founded by few or related individuals, genetic diversity can be lost and inbreeding can accumulate rapidly, calling into question their ultimate utility for release into the wild. Furthermore, domestication selection for survival in captive conditions is another concern. Therefore, it is crucial to understand the dynamics of population sizes, particularly the effective population size, and genetic diversity at non-neutral, at adaptive loci in captive populations.

In this study, we assessed effective population sizes and genetic variation at both neutral microsatellite markers, as well as SNP variants from the MHC-B locus of a captive Red Junglefowl population. This population is represents a rare instance of a population with a well-documented history in captivity, following a realistic scenario of chain-of-custody, unlike captive lab populations. Our analysis, which included 27 individuals comprising the entirety of one captive population show very low neutral and adaptive genetic variation, as well as low effective sizes, which are surprising in spite of the known demographic history. Finally, our study also shows the divergent impacts of small effective size and inbreeding in captive populations on microsatellite versus adaptive genetic variation in the MHC-B locus. Our study provides insights into the difficulties of maintaining adaptive genetic variation in small captive populations.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted June 19, 2018.
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Effective population sizes and adaptive genetic variation in a captive bird population
Giridhar Athrey, Nikolas Faust, Anne-Sophie Charlotte Hieke, I. Lehr Brisbin
bioRxiv 307728; doi: https://doi.org/10.1101/307728
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Effective population sizes and adaptive genetic variation in a captive bird population
Giridhar Athrey, Nikolas Faust, Anne-Sophie Charlotte Hieke, I. Lehr Brisbin
bioRxiv 307728; doi: https://doi.org/10.1101/307728

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