Combining population genomics and ecological niche modeling to assess taxon limits between Carex jemtlandica and C. lepidocarpa  

作　　者：Malene Nygaard Petri Kemppainen James D.M.Speed Reidar Elven Kjell Ivar Flatberg Leif P.Galten Narjes Yousefi Heidi Solstad Mika Bendiksby 

机构地区：[1]NTNU University Museum,Norwegian University of Science and Technology,Trondheim NO-7491,Norway [2]Ecological Genetics Research Unit,Organismal and Evolutionary Biology Research Program,Faculty of Biological and Environmental Sciences,University of Helsinki,Viikinkaari 1,Helsinki 00790,Finland [3]Natural History Museum,University of Oslo,Oslo NO-0318,Norway [4]Department of Systematic and Evolutionary Botany,University of Zurich,Zurich 8008,Switzerland

出　　处：《Journal of Systematics and Evolution》2021年第4期627-641,共15页植物分类学报（英文版）

摘　　要：Carex section Ceratocystis(Cyperaceae)is a group of recently evolved plant species,in which hybridization is frequent,introgression is documented,taxonomy is complex,and morphological boundaries are vague.Within this section,a unified taxonomic treatment of the Carex jemtlandica-Carex lepidocarpa species complex does not exist,and Norway may currently be the sole country accepting species rank for both.Carex jemtlandica is mainly confined to Fennoscandia and is thus a Fennoscandian conservation responsibility.This motivated us to test the principal hypothesis that both C jemtlandica and C lepidocarpa represent evolutionary significant units,and that both deserve their current recognition at species level.We investigated their evolutionary distinctiveness in Norway,using restriction site-associated DNA sequencing and ecological niche modeling.Our genomic results reveal two genetic clusters,largely corresponding to C jemtlandica and C lepidocarpa that also remain distinct in sympatry,despite clear indications of ongoing hybridization and introgression.The ecological niche modeling suggests that they occupy different environmental niches.Jointly,our results clearly show that C.jemtlandica and C lepidocarpa represent separately evolving entities that should qualify recognition as evolutionary significant units.Given the high level of introgression compared to other hybridizing species pairs in Carex we recommend treating C jemtlandica as a subspecies of C lepidocarpa.

关 键 词：CYPERACEAE ecological niche modelling natural hybridization population genetics RAD sequencing species delineation TAXONOMY 

分 类 号：Q94[生物学—植物学]