A Genetic Analysis of the Impact of Generation Time and Road - Based Habitat Fragmentation on Eastern Box Turtles ( Terrapene c . carolina )

  • Marsack K
  • Swanson B
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Abstract

See, stats, and : https : / / www . researchgate . net / publication / 237577936 A Time - Based Eastern (Terrapene . carolina) Article Impact : 1. 03 : 10 . 1643 / CE - 08 - 233 CITATIONS 13 READS 90 2 , including : Bradley . Swanson Central 39 SEE All - text , letting . Available : Bradley . Swanson Retrieved : 15 Historically , the Eastern Box Turtle (Terrapene c . carolina) was found in 31 counties in Michigan ' s Lower Peninsula , although it has been extirpated from 13 of those counties in the last ten years . One possible cause of the decline is road - based habitat fragmentation with resulting demographic and genetic consequences . Accurately identifying population structure is necessary to determine conservation units and aid in the recovery of Terrapene c . carolina . We genotyped 163 turtles at eight microsatellite loci from three locations in southwestern Michigan covering 360 km 2 . We found high levels of genetic variation (H =0.83;A=16)andlowlevelsofgeneticdifferentiation(FST=0.006)inthesystem.Thethreeareasexistasasinglepopulationandtherewasalowrate(11%)ofmisassignmentacrossthesites.Therewasinitialevidenceofageneticbottleneckintwoofthethreepopulationsandthesystemasawhole.However,additionalanalysisfailedtofindamode-shiftinallelefrequenciesanddidnotdetectanyfurtherevidenceofabottleneckinanyofthepopulations.Weconcludethattheconflictinggeneticindicationofabottleneck,despitethegeographicevidence,isduetothelonggenerationtimeofTerrapenec.carolina.Further,ourstudysuggeststhattheretentionofgeneticvariationdespitepopulationdeclinesallowsmanagersflexibilityindealingwiththeconservationoflong-livedspecies.H

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Authors

  • Kelly Marsack

  • Bradley J Swanson

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