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Using resistance distance from circuit theory to model dispersal through habitat corridors

Journal of Plant Ecology 2018年第3期11卷 385-393页

作者： jan thiele Sascha Buchholz Jens Schirmel Institute of Landscape Ecology University of MünsterHeisenbergstr.2Münster 48149Germany Department of Ecology TU BerlinRothenburgstr.12Berlin 12165Germany Berlin-Brandenburg Institute of Advanced Biodiversity Research(BBIB) Altensteinstr.34Berlin 14195Germany Institute of Environmental Sciences University Koblenz-LandauFortstr.7Landau 76829Germany

Aims Resistance distance(RD),based on circuit theory,is a promising metric for modelling effects of landscape configuration on dispersal of organ-isms and the resulting population and community *** values of RD reflect the likelihood of a random walker to reach from a source to a certain destination in the *** it has successfully been used to model genetic structures of animal populations,where it most often outperforms other isolation metrics,there are hardly any applications to plants and,in particular,to plant community *** aims were to test if RD was a suitable metric for studying dispersal processes of plants in narrow habitat corridors(linear landscape ele-ments[LLE]).This would be the case,if dispersal processes(seed dis-persal and migration)resembled random ***,we compared the model performance of RD against least-cost distance(LCD)and Euclidean distance(ED).Finally,we tested the suitability of different cost surfaces for calculations of LCD and *** We used data from 50 vegetation plots located on semi-natural LLE(field margins,ditches,road verges)in eight agricultural landscapes of Northwest *** mapped LLE,including hedges and tree rows,from aerial images in a Geographic Information System,con-verted the maps into raster layers,and assigned resistance values to the raster cells,where all cells outside of LLE received infinite resist-ance and,thus,represented barriers to *** all pairs of plots within study areas,we calculated Jaccard similarity assuming that it was a proxy(or correlate)of dispersal events between ***,we calculated RD and LCD of the network of LLE and ED between the *** modelled the effects of distance metrics on community similarity using binomial generalized linear mixed *** Findings ED was clearly the least suitable isolation ***,we found that RD performed better than LCD at modelling Jaccard *** varied markedly betwee

关键词： connectivity floristic similarity isolation landscape migration least-cost distance

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How do altitude and soil properties influence the taxonomic and phylogenetic structure and diversity of Brazilian páramo vegetation?

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Journal of Mountain Science 2020年第5期17卷 1045-1057页

作者： Markus GASTAUER jan thiele Stefan POREMBSKI Andreza Viana NERI Instituto Tecnologico Vale R.Boaventura da Silva955CEP 66055-090Bairro NazareBelemPABrazil Universidade Federal do Para Programa de pos-graduacao em EcologiaRuaAugusto Correa01CEP 66075-110GuamaBelemBrazil Thünen Institute Institute of BiodiversityBundesallee 6538116 BraunschweigGermany University of Rostock Institute of BioscienceDepartment of Botany and Botanical GardenWismarsche Str.44/45D-18051 RostockGermany Universidade Federal de Vicosa Department of Plant BiologyLaboratory of Ecology and Evolution of PlantsCampus Universitario s/n36570-900VigosaMinas GeraisBrazil

Altitude and environmental variables such as edaphic properties are considered determinants of species distribution and community composition in mountain ***,we aimed to outline the effects of distinct mountain peaks,altitude and soil properties on community composition,species density,phylogenetic structure and diversity of angiosperm páramo communities from the Serra do Brigadeiro State Park,Minas Gerais,southeastern *** that,we identified all angiosperm species found in 300 plots(1 m×1 m)from three mountain peaks,measured soil depth and analyzed soil fertility and texture in each *** reduce the number of soil variables and species composition,we computed principal coordinates based on soil properties and principal coordinates based on species-plot matrix for each ***,we computed the standard effect sizes of the mean phylogenetic pairwise distance and the mean nearest phylogenetic taxon distance for each plot to investigate differences in the degree of relatedness among coexisting *** compared differences in response variables between peaks and modelled them in function of altitude and principle components of soil properties using mixed effect *** density and phylogenetic diversity differed between peaks,but,contrary to the previous findings,no relationships between species richness or phylogenetic diversity and altitude or soil properties were found,indicating that further investigations are necessary to understand the altitude-biodiversity relationship in Brazilian páramo *** composition differed between peaks and depended on altitude,soil properties and interactions between them,indicating that upward shifting of bioclimatic conditions due to climate changes may alter communities of this *** structure differed between peaks and was influenced by altitude and soil *** phylogenetic clustering increased with altitude,eventual upward movements of species in Brazilian

关键词： Mountainous ecosystems Altitudebiodiversity relationship High altitude grasslands Phylogenetic diversity Community assemblage Conservation

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