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Population biology of two land snails (Mesomphix spp.): variation among six southern appalachian sites with differing disturbance histories

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Summary

Ecological and genetic properties of two North American terrestrial gastropods (Mesomphix spp.) were characterized in paired control and previously logged watersheds in two North Carolina forests (Coweeta and the Great Smoky Mountains National Park) of the Southern Appalachian Biosphere Reserve Cluster. Shell growth was greater in the control sites, but density and mortality were largely independent of prior logging history and forest reserve. Based on starch gel electrophoresis data, both species showed their highest levels of genetic diversity in the Coweeta forest, the component of the reserve cluster which had the most extensive and variable history of logging disturbance. M. subplanus also exhibited higher levels of heterozygosity in logged than in control watersheds, and M. andrewsae showed over twice as many rare alleles in disturbed sites as in control sites. F-statistic analysis depicted both excess levels of homozygosity and moderate genetic differentiation among the populations, reflecting the effects of small population size and perhaps drift and inbreeding. Estimated gene flow was relatively low. These results correspond to the recent finding by Bryant et al. (1987) and others on the effects of bottlenecks, and to the contrasting history of habitat instability of the two major study forests.

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  1. Department of Biology, University of North Carolina, Coker Hall, 27599-3280, Chapel Hill, NC, USA

    Alan E. Stiven

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Stiven, A.E. Population biology of two land snails (Mesomphix spp.): variation among six southern appalachian sites with differing disturbance histories. Oecologia 79, 372–382 (1989). https://doi.org/10.1007/BF00384317

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