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000029058 041__ $$aeng
000029058 080__ $$a58
000029058 100__ $$aFrey, David J.$$uDepartment of Biology, University of Fribourg, Switzerland
000029058 245__ $$9eng$$aHigh genetic and morphological diversity despite range contraction in the diploid Hieracium eriophorum (Asteraceae) endemic to the coastal sand dunes of south-west France
000029058 269__ $$c2012-03-04
000029058 520__ $$9eng$$aEndemic plants inhabiting coastal sand dunes show augmented extinction risks due to the dynamic nature of dunes and strong human pressure on coastal areas. To investigate the survival strategies and threats to long-term survival of such species, we combined genetic, morphological and biogeographical approaches, using the example of Hieracium eriophorum (Asteraceae) and its putative cryptic sister species H. prostratum, which are endemic to the longest coastal sand dune in Europe. An analysis of amplified fragment length polymorphism revealed high within-population genetic variability, and slight isolation by distance was the only indication of genetic population structure. Thus, no signs of genetic threats to survival were found. Furthermore, genetic and morphometric data provided no evidence for the existence of two species. Therefore, we propose to synonymize H. prostratum with H. eriophorum and provide a nomenclatural overview with typification. Finally, an analysis of historical distribution records showed that, during the last 100 years, the species was lost from its range margins, where its habitat became fragmented. Taken together, our results suggest that one successful survival strategy of narrow endemics may be the achievement of large local population sizes on a small geographical scale, thus avoiding the genetic problems inherent to small and fragmented populations. Dune management policies should thus take care that the current tendencies to allow more erosion will not result in too severe fragmentation of the remaining continuous stretches of dune habitat.
000029058 695__ $$9eng$$aAFLP ; Atlantic ; coastal sand dunes ; conservation ; endemism ; genetic structure ; management ; multivariate morphometrics
000029058 700__ $$aHaag, Christoph R.$$uDepartment of Biology, University of Fribourg, Switzerland
000029058 700__ $$aKozlowski, Gregor$$uDepartment of Biology, University of Fribourg, Switzerland - Department of Geosciences, University of Fribourg, Switzerland
000029058 700__ $$aTison, Jean-Marc$$uChemin du Valentier, 38540 Heyrieux, France
000029058 700__ $$aMráZ, Patrik$$uDepartment of Biology, University of Fribourg, Switzerland
000029058 773__ $$g2012///-$$tBotanical Journal of the Linnean Society
000029058 775__ $$gPublished version$$ohttp://dx.doi.org/10.1111/j.1095-8339.2012.01215.x
000029058 8564_ $$ffre_hgm.pdf$$qapplication/pdf$$s365145$$uhttp://doc.rero.ch/record/29058/files/fre_hgm.pdf$$yorder:1$$zpdf
000029058 8564_ $$ffre_hgm_sm.pdf$$qapplication/pdf$$s133455$$uhttp://doc.rero.ch/record/29058/files/fre_hgm_sm.pdf$$yorder:2$$zSupplementary material
000029058 918__ $$aFaculté des sciences$$bDécanat, Ch. du Musée 6A, 1700 Fribourg$$cBiologie
000029058 919__ $$aUniversité de Fribourg$$bFribourg$$ddoc.support@rero.ch
000029058 980__ $$aPOSTPRINT$$bUNIFR$$fART_JOURNAL
000029058 990__ $$a20120502094307-YG