Gene diversity and demographic turnover in central and peripheral populations of the perennial herbGypsophila fastigiata

Abstract

1600-0706.2002.11907.x General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Within-population gene diversity (H S ) was estimated (using allozyme markers) for 16 populations of the perennial, outcrossing plant, Gypsophila fastigiata, on the Baltic island of O 8 land. The populations were characterized by data on extent, density, life-stages, and habitat diversity. Populations were classed as central or peripheral in relation to the distribution of ''alvar'' (habitats with shallow, calcareous soils on limestone bedrock) on southern O 8 land. Three minimal adequate models were used to explain H S and the proportions of juveniles and dead adults. In the first model, H S was significantly lower in peripheral populations and there were no significant additional effects of other explanatory variables. The lower diversity in peripheral populations can be explained by a combination of genetic drift (in populations that vary in size in response to habitat fragmentation) and lower levels of interpopulation gene flow than in central populations. In the two life-stage models, peripheral populations had significantly larger proportions of both juveniles and dead adultsindicating a greater demographic turnover than in the central populations. There were also significant effects of H S and species diversity on the proportion of juveniles. The central or peripheral position of populations is the strongest predictor of both within-population gene diversity and life-stage dynamics in O 8 land G. fastigiata. M. Lönn, Södertörn Uni6. College,

Niche modelling and landscape genetics of Caryocar brasiliense (“Pequi” tree: Caryocaraceae) in Brazilian Cerrado: an integrative approach for evaluating central–peripheral population patterns

“…The percentage of juveniles (J) of C. brasiliense shows a much clearer central-peripheral pattern than ecological suitability and this could be in principle also associated with genetic diversity by different mechanisms (see Lönn and Prentice 2002). At least, our analyses show ( Table 2) that there is a shared geographic effect between ecological (mainly J) and genetic diversity, and H e is the genetic parameter with highest (although not statistically significant) correlation with J.…”

Effects of parasite and historic driven selection on the diversity and structure of a MHC-II gene in a small mammal species (Peromyscus leucopus) undergoing range expansion

“…Even though this hypothesis does not constitute a general rule, as suggested by Eckert et al (2008) and by Pironon et al (2016), this pattern was detected in several species including Podarcis muralis (Gassert et al 2013), Rana temporaria (Johansson et al 2006) or Gypsophila fastigiata (Lönn and Prentice 2002). In line with these results, the genetic diversity in both the Cytb and DRB sequences for P. leucopus showed the expected decrease within both genetic lineages: from the Great Lakes to the northern shore of the St Lawrence, and from the US East Coast to the southern Quebec region south of the St Lawrence river.…”

Changes of woody species diversity, horizontal and vertical distribution of stems across interior to outside within a primate rich habitat of Northeast India

“…Even though, highest species richness along with 64 unique and 34 single stone species in interior zone symbolized a more complex ecosystem; because number of species can enhance the function and interaction between species association and it could be extended between different adjacent communities. However, interior populations represent the geometrical central populations and experience a greater gene flow from surrounding peripheral than peripheral or outside populations (Lonn and Prentice 2002). In our study, the interior zone was comparatively more densities, which grasped more genetic diversity than the fragmented peripherals.…”

“…In our study, the interior zone was comparatively more densities, which grasped more genetic diversity than the fragmented peripherals. Because, there exist positive correlations between tree population density and higher fitness of genetic diversity (Oostermeijer et al 1994;Lonn and Prentice 2002); which might run according to several succession stages in relatively mild disturbed ecosystem. We recorded 34 species (41st rank), 27 species (38th rank) and 16 species (29th rank) ranked highest in interior, peripheral and outside zones respectively with single individuals ranked high due to their very small population and low regeneration capacity.…”