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Reconsidering the management paradigm of fragmented populations

View ORCID ProfileOren Kolodny, Michael R. McLaren, View ORCID ProfileGili Greenbaum, View ORCID ProfileUma Ramakrishnan, Marcus W. Feldman, Dmitri Petrov, Ryan W. Taylor
doi: https://doi.org/10.1101/649129
Oren Kolodny
1Department of Biology, Stanford University, USA
2Stanford Program for Conservation Genomics, Stanford University, USA
3Department of Ecology, Evolution, and Behavior, The Hebrew University of Jerusalem, Israel
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  • For correspondence: orenkolodny@gmail.com
Michael R. McLaren
4Department of Population Health and Pathobiology, North Carolina State University, USA
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Gili Greenbaum
1Department of Biology, Stanford University, USA
2Stanford Program for Conservation Genomics, Stanford University, USA
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Uma Ramakrishnan
2Stanford Program for Conservation Genomics, Stanford University, USA
5National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India
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Marcus W. Feldman
1Department of Biology, Stanford University, USA
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Dmitri Petrov
1Department of Biology, Stanford University, USA
2Stanford Program for Conservation Genomics, Stanford University, USA
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Ryan W. Taylor
1Department of Biology, Stanford University, USA
2Stanford Program for Conservation Genomics, Stanford University, USA
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Abstract

Habitat fragmentation and population declines call for informed management of many endangered species. The dominant paradigm for such management focuses on avoiding deleterious inbreeding effects in separated populations, by facilitating migration to maintain connectivity between them, an approach epitomized by the “one migrant per generation” rule. We show that this paradigm fails to take into account two important factors. First, it ignores an inherent trade-off: maintaining within-population genetic diversity is at the expense of maintaining global diversity. Migration increases local within-population genetic diversity, but also homogenizes the meta-population, which may lead to erosion of global genetic diversity. Second, this paradigm does not consider that because many fragmented species have declined in numbers only within the last century, they still carry much of the high genetic diversity characteristic of the historically large population. The conservation of a species’ global diversity, crucial for evolutionarily adaptation to ecological challenges such as epidemics, industrial pollutants, or climate change, is paramount to a species’ long-term survival. Here we discuss how consideration of these factors can inform management of fragmented populations and provide a framework to assess the impact on genetic diversity of different management strategies. We also propose two alternative management strategies to replace the “one migrant per generation” dogma.

Footnotes

  • https://ryantaylor.shinyapps.io/gmfp/

  • https://github.com/rwtaylor/GMFP

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted May 24, 2019.
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Reconsidering the management paradigm of fragmented populations
Oren Kolodny, Michael R. McLaren, Gili Greenbaum, Uma Ramakrishnan, Marcus W. Feldman, Dmitri Petrov, Ryan W. Taylor
bioRxiv 649129; doi: https://doi.org/10.1101/649129
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Reconsidering the management paradigm of fragmented populations
Oren Kolodny, Michael R. McLaren, Gili Greenbaum, Uma Ramakrishnan, Marcus W. Feldman, Dmitri Petrov, Ryan W. Taylor
bioRxiv 649129; doi: https://doi.org/10.1101/649129

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