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Genetic differentiation among populations of Sesleria albicans Kit. ex Schultes (Poaceae) from ecologically different habitats in central Europe / Christoph Reisch in Heredity, 91 (2003)

Public Citation [article]  inHeredity > 91 (2003) . - 519-527 Titre : Genetic differentiation among populations of Sesleria albicans Kit. ex Schultes (Poaceae) from ecologically different habitats in central Europe Type de document : Imprimé Auteurs : Christoph Reisch ; Peter Poschlod ; R. Wingender Année de publication : 2003 Article en page(s) : 519-527 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Diversité génétique Mots-clés : Sesleri albicans Kit. ex Schultes Résumé : As observed for many other plant species, the populations of Sesleria albicans in Central Europe are located in habitats, which differ to a high degree from each other with regard to ecological factors such as nutrients, light and water as well as in type of land use. The species colonizes limestone cliffs, pavements, screes, grazed and mown grasslands, heaths, fens and open woodlands. In this study, we used random amplified polymorphic DNA (RAPD) analysis to investigate the genetic differentiation among 25 populations of S. albicans from six different types of habitat (beech forests, alpine and lowland rocky ridges, lowland screes, fens, calcareous grasslands). With RAPD analysis, 344 fragments could be amplified, of which 95.9% were polymorphic. The level of polymorphism ranged from 29.7 to 56.7% polymorphic bands per population and was correlated with population size. In an analysis of molecular variance (AMOVA), used to detect variation among individuals within populations, among populations from the same habitat and among different habitats, most of the genetic variation was found within populations (62.06%) and among populations from the same habitat (33.36%). In contrast, only a very low level of differentiation could be observed among different habitats (4.58%). The results of our study give only little evidence for an ecotypic differentiation of Sesleria albicans. This differentiation is principally conceivable, but obviously not related to the investigated RAPD loci. Lien pérenne : DOI : 10.1038/sj.hdy.6800350 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148350 Reisch, Christoph, Poschlod, Peter, Wingender, R. 2003 Genetic differentiation among populations of Sesleria albicans Kit. ex Schultes (Poaceae) from ecologically different habitats in central Europe. Heredity, 91: 519-527.

Genetic variation on the rocks : the impact of climbing on the population ecology of a typical cliff plant / Frank Vogler (2011) 

Public Citation est un tiré à part de 48 (Journal of applied ecology, 48 [01/01/2011]) Titre : Genetic variation on the rocks : the impact of climbing on the population ecology of a typical cliff plant Titre original : Variation génétique sur les rochers : l'impact de l'escalade sur l'écologie des populations d'une plante typique de la falaise Type de document : Tiré à part de revue Auteurs : Frank Vogler ; Christoph Reisch Année de publication : 2011 Importance : 899-905 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Etude d'aménagement, étude d'impact, actions anthropiques et leur impact [CBNPMP-Thématique] Sports et activités de pleine nature [CBNPMP-Thématique] Habitats rocheux et grottes [CBNPMP-Thématique] Impact sur la flore [CBNPMP-Thématique] Protection contre les risques naturels et anthropiques [CBNPMP-Thématique] Végétation chasmophyte des pentes rocheuses et falaises Résumé : 1. Rock climbing enjoys enormous popularity world-wide. As a consequence, the anthropogenic pressure on the vegetation of formerly undisturbed cliff ecosystems is continuously increasing. 2. The impact of rock climbing on population structure and genetic variation of the rare plant species Draba aizoides was investigated representatively for many other typical central European cliff plants. Populations from eight climbed and from eight pristine cliffs were compared through the use of vertical transect analyses and molecular markers. 3. Population structure differed between climbed and pristine cliffs. Individuals of D. aizoides were significantly smaller and less frequent on climbed compared with pristine cliffs. On plateau sites, the species’ occurrence was unaffected by climbing activities; it was significantly less frequent on the faces, but more frequent on the tali of climbed in comparison with pristine cliffs. 4. Genetic variation was greater in populations from climbed compared with pristine cliffs, and genetic differentiation was stronger between subpopulations from pristine cliffs than between subpopulations from climbed cliffs. 5. Synthesis and applications. Rock climbing clearly affects population structure and genetic variation of D. aizoides. Seed dispersal is presumably enhanced by rock climbers but climbers remove and drop plant individuals from cliff faces, which causes a downward shift in population structure. This shift in turn reduces genetic differentiation between upper and lower subpopulations. In mountain regions that attract sport climbing, conservation management plans should therefore always ensure the provision of completely unclimbed cliffs to protect the native vegetation. Lien pérenne : DOI : 10.1111/j.1365-2664.2011.01992.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=135223 Vogler, Frank, Reisch, Christoph 2011 Genetic variation on the rocks : the impact of climbing on the population ecology of a typical cliff plant = Variation génétique sur les rochers : l'impact de l'escalade sur l'écologie des populations d'une plante typique de la falaise. Journal of applied ecology, 48 : 899-905.

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
24546	V	Tiré à part	Bureaux	Espaces naturels sensibles	Consultable

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