Monitoring Endangered Species Populations: Gene Dispersal Can Have Pronounced Effects on the Relationship between Census Size and Genetic Diversity

Abstract

Anthropogenic activities are increasing habitat fragmentation, as well as the number of threatened and endangered species. Thus, isolated fragments with natural remnant stands, or in situ or ex situ endangered species rescue populations, are on the rise. The most common method for assessing the “conservation health” of such populations is to determine or estimate the census size. However, while it is known that the census size of a population does not always correlate with its genetic diversity, methods for modeling how different factors can drive variation in the relationship of census size to genetic diversity in plant populations are needed. Here we use the computer program NEWGARDEN to investigate how the relationship of stand size versus genetic diversity (measured as both the percent of the founding alleles retained and FIT) can be extremely variable depending on founder number, founder density, and gene dispersal distances. Populations of endangered species that appear to have the same conservation health in terms of similar population numbers may differ greatly in their conservation health as indicated by the genetic diversity they retain. NEWGARDEN can be used to explore how different founding and intra- or interspecific life history characteristics can affect genetic diversity relative to census size. If proper historical data exist, NEWGARDEN can also be used to estimate the percent of founding genetic diversity remaining in a given stand.

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S. Rogstad and S. Pelikan, "Monitoring Endangered Species Populations: Gene Dispersal Can Have Pronounced Effects on the Relationship between Census Size and Genetic Diversity," American Journal of Plant Sciences, Vol. 4 No. 10, 2013, pp. 1932-1937. doi: 10.4236/ajps.2013.410238.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] R. Frankham, J. D. Ballou and D. A. Briscoe, “Introduction to Conservation Genetics,” 2nd Edition, Cambridge University Press, Cambridge, 2010. http://dx.doi.org/10.1017/CBO9780511809002
[2] F. W. Allendorf, G. Luikart and S. N. Aitken, “Conservation and the Genetics of Populations,” 2nd Edition, Wiley-Blackwell, Hoboken, 2012.
[3] I. R. Franklin, “Evolutionary Changes in Small Populations,” In: M. E. Soulé and B. M. Wilcox, Eds., Conservation Biology: An Evolutionary-Ecological Perspective, Sinauer, Sunderland, 1980, pp. 135-149.
[4] M. E. Soulé, “Thresholds for Survival: Maintaining Fitness and Evolutionary Potential,” In: M. E. Soulé and B. M. Wilcox, Eds., Conservation Biology: An Evolutionary-Ecological Perspective, Sinauer, Sunderland, 1980, pp. 151-170.
[5] R. Frankham, “Effective Population Size/Adult Population Size Ratios in Wildlife: A Review,” Genetical Research, Vol. 66, No. 1, 1995, pp. 97-107.
[6] R. S. Waples, “Definition and Estimation of Effective Population Size in the Conservation of Endangered Species,” In: S. R. Beissinger and D. R. McCullough, Eds., Population Viability Analysis, University of Chicago Press, Chicago, 2002, pp. 147-168.
[7] D. Hedgecock, “Does Variance in Reproductive Success Limit Effective Population Sizes of Marine Organisms?” In: A. R. Beaumont, Ed., Genetics and Evolution of Aquatic Organisms, Chapman and Hall, London, 1994, pp. 122-134.
[8] R. Lande, “Mutation and Conservation,” Conservation Biology, Vol. 9, No. 4, 1995, pp. 782-791.
[9] M. Lynch, J. Conery and R. Bürger, “Mutation Accumulation and the Extinction of Small Populations,” The American Naturalist, Vol. 146, No. 4, 1995, pp. 489-518.
[10] Y. Willi, “Mutational Meltdown in Selfing Arabidopsis lyrata,” Evolution, Vol. 67, No. 3, 2012, pp. 806-815.
[11] S. H. Rogstad and S. Pelikan, “Genetic Diversity in Establishing Plant Populations: Founder Number and Geometry,” Science Publishers, Enfield, 2011.
[12] S. Pelikan and S. H. Rogstad, “NEWGARDEN: A Computer Program to Model the Population Dynamics and Genetics of Establishing and Fragmented Plant Populations,” Conservation Genetics Resources, Vol. 5, No. 1, 2013, pp. 857-862. http://dx.doi.org/10.1007/s12686-013-9869-9
[13] D. L. Hartl, “A Primer of Population Genetics,” 2nd Edition, Sinauer Associates, Inc., Sunderland, 1987.

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