Genetic consequences of landscape features in two rear edge, highly fragmented metapopulations of a mediterranean conifer

作者：Camilla Avanzi, Alessandro Vitali, Paolo Piovani, Ilaria Spanu, Carlo Urbinati, Giovanni G. Vendramin, Matteo Garbarino, Andrea Piotti · 发表于：Landscape Ecology · 年份：2024 · DOI：10.1007/s10980-024-01887-z · 被引用次数：9 · 研究领域：Ecology and Vegetation Dynamics Studies、Forest ecology and management、Genetic diversity and population structure

Abstract Context Habitat fragmentation is expected to erode genetic diversity, which instead needs to be preserved for promoting species adaptation to a changing climate. As this expectation has found mixed support in forest trees, consistent results on the genetic consequences of fragmentation requires adequately replicated experimental designs, as well as an explicit assessment of which landscape features, if any, could mitigate its detrimental effects. Objective Evaluating the role of several landscape attributes in buffering the detrimental effects of fragmentation in two metapopulations of silver fir. Methods We genotyped 904 silver fir ( Abies alba Mill.) trees from 18 local populations forming two metapopulations comparable for size and extension in the Apennines, a Mediterranean mountain range. We identified the signatures left by the fragmentation process on the genetic features of silver fir local populations. After removing potentially confounding effects due to different evolutionary histories, we used a multivariate approach for testing the relative effect of demographic, geographic, environmental and topographic factors on genetic features of both metapopulations. Results We found comparable signals of the habitat fragmentation impact on the genetic diversity and structure of both investigated metapopulations. Fragmentation effects were less pronounced in the largest local populations (but not the least isolated), located on gentler slopes with higher soil water...