Conservation Genetics

, Volume 12, Issue 4, pp 1115–1129 | Cite as

Depleted genetic variation of the European ground squirrel in Central Europe in both microsatellites and the major histocompatibility complex gene: implications for conservation

  • Štěpánka Říčanová
  • Josef Bryja
  • Jean-François Cosson
  • Csongor Gedeon
  • Lukáš Choleva
  • Michal Ambros
  • František Sedláček
Research Article

Abstract

Habitat fragmentation may influence the genetic make-up and adaptability of endangered populations. To facilitate genetic monitoring of the endangered European ground squirrel (EGS), we analyzed 382 individuals from 16 populations in Central Europe, covering almost half of its natural range. We tested how fragmentation affects the genetic architecture of presumably selectively neutral (12 microsatellites) and non-neutral (the major histocompatibility class II DRB gene) loci. Spatial genetic analyses defined two groups of populations, “western” and “eastern”, with a significantly higher level of habitat fragmentation in the former group. The highly fragmented western populations had significantly lower genetic diversity in both types of markers. Only one allele of the DRB gene predominated in populations of the western group, while four alleles were evenly distributed across the eastern populations. Coefficient of inbreeding values (FIS) calculated from microsatellites were significantly higher in the western (0.27–0.79) than in eastern populations (−0.060–0.119). Inter-population differentiation was very high, but similar in both groups (western FST = 0.23, eastern FST = 0.25). The test of isolation by distance was significant for the whole dataset, as well as for the two groups analyzed separately. Comparison of genetic variability and structure on microsatellites and the DRB gene does not provide any evidence for contemporary selection on MHC genes. We suggest that genetic drift in small bottlenecked and fragmented populations may overact the role of balancing selection. Based on the resulting risk of inbreeding depression in the western populations, we support population management by crossbreeding between the western and eastern populations.

Keywords

Souslik Endangered species Sciuridae Habitat fragmentation DRB MHC Class II 

Supplementary material

10592_2011_213_MOESM1_ESM.doc (44 kb)
Supplementary Table A List of microsatellite loci tested. NA = number of alleles. Letter above the name of a locus identifies the same amplification set (set A, B and C) (DOC 43 kb)
10592_2011_213_MOESM2_ESM.doc (56 kb)
Supplementary Table B Estimation of the presence of null alleles in each population and for each microsatellite locus and the DRB gene using FreeNA software (Chapuis and Estoup 2007). Only values higher than 0.15 are marked in grey, which are considered to represent a high probability of the presence of a null allele (DOC 55 kb)
10592_2011_213_MOESM3_ESM.doc (60 kb)
Supplementary Table C Pairwise FSTENA values (from FreeNA, Chapuis and Estoup 2007) between EGS populations based on microsatellite data are above the diagonal, and values of F′ST (according to Hedrick 2005) are below. Note: Marks of significance: * P < 0.05, NS-non significant (P > 0.05) (DOC 60 kb)
10592_2011_213_MOESM4_ESM.doc (30 kb)
Supplementary Table D Comparison of values of FST in microsatellites and in MHC (DRB) using different corrections of FST and confidential intervals for FST in microsatellites (DOC 30 kb)

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Štěpánka Říčanová
    • 1
    • 2
  • Josef Bryja
    • 2
    • 3
  • Jean-François Cosson
    • 4
  • Csongor Gedeon
    • 5
  • Lukáš Choleva
    • 6
  • Michal Ambros
    • 7
  • František Sedláček
    • 1
  1. 1.Department of Zoology, Faculty of ScienceUniversity of South BohemiaČeské BudějoviceCzech Republic
  2. 2.Department of Population BiologyInstitute of Vertebrate BiologyBrnoCzech Republic
  3. 3.Department of Botany and Zoology, Faculty of ScienceMasaryk UniversityBrnoCzech Republic
  4. 4.Centre de Biologie et Gestion des PopulationsINRAMontferrier-sur-LezFrance
  5. 5.Research Institute of Soil Biology and Agricultural ChemistryHungarian Academy of SciencesBudapestHungary
  6. 6.Department of Vertebrate Evolutionary Biology and Genetics, Institute of Animals Physiology and GeneticsASCRLiběchovCzech Republic
  7. 7.Ponitrie Landscape Protected AreaNitraSlovakia

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