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Integrative Zoology 2023年第3期18卷 569-580页

作者： Long JIN Yuchi ZHENG Xiaofeng LUAN Wenbo LIAO Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education) China West Normal UniversityNanchongChina Chengdu Institute of Biology Chinese Academy of SciencesChengduChina School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina

The patterns of isolation by distance(IBD)entailing increased genetic differentiation among populations have aroused extensive concerns for evolutionary biologists.Although the IBD may act on spatial processes contribut-ing to the genetic differentiation among populations in anuran species,the factors shaping the IBD of frogs among populations in natural systems are largely unknown.Here,we studied the genetic differentiation among six popula-tions with 24 individuals of the spotted-leg treefrog along a latitudinal gradient(1860.31 km)based on 1020 single nucleotide polymorphisms from restriction site-associated DNA sequencing.The results showed that the genetic diversity differed signiﬁcantly among populations and that the insular populations had higher genetic diversity than the mainland populations.Furthermore,we also found a signiﬁcant genetic differentiation among populations(FST=0.277)and no sign of inbreeding(FUNI=-0.145).The IBD was detected for all populations,and a higher degree of the IBD was indicated when controlling for the effects of the isolation between Hainan and mainland populations caused by the Qiongzhou Strait.Ourﬁndings suggest that the form of the Qiongzhou Strait plays a key role in shaping the genetic diversity and population differentiation in treefrogs.

关键词： genetic diversity isolation by distance Polypedates megacephalus population differentiation single nucleotide polymorphisms

Taxonomic status of Chinese blue sheep(Pseudois nayaur):new evidence of a distinct subspecies

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Integrative Zoology 2020年第3期15卷 202-212页

作者： Hui GAO Nannan LI Yongjie HUANG Fujie QIAO Junle LI Zongzhi LI Yanxiang LI Zhenghuan WANG Liwei TENG Zhensheng LIU College of Wildlife and Protected Area Northeast Forestry UniversityHarbinChina Forestry Science and Technology Research Institute of Greater Hinggan in Inner Mongolia YakeshiChina School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina School of Life Sciences Lvliang UniviersityLvliangChina School of Life Sciences East China Normal UniversityShanghaiChina Key Laboratory of Conservation Biology National Forestry and Grassland AdministrationHarbinChina

The blue sheep is an endemic species to the Qinghai-Tibet Plateau and surrounding regions.It has been regarded as having 2 subspecies:Pseudois nayaur nayaur and P.n.szechuanensis.However,such a classification remains controversial.Herein,we analyze 10 microsatellite loci and part of the mitochondrial control region for clarification in such taxonomic debates.We use samples from 168 individuals from 6 geographic populations covering almost all the distribution areas of the species in China to carry out comparisons.Phylogenetic trees derived from both the microsatellite and mitochondrial markers combined with the discriminant analysis of principal components(DAPC)and the STRUCTURE analysis reveal that the individuals in the Helan Mountains are well grouped with a distinct evolutionary lineage and are significantly different from the other populations of P.n.szechuanensis according to Fst values,implying that this isolated population should be categorized as a valid subspecies;namely,Pseudois nayaur alashanicus.The isolation-by-distance(IBD)analysis shows a significant positive relationship between genetic and geographical distances among the populations.

关键词： blue sheep isolation by distance microsatellite mtDNA control region taxonomy

Restricted dispersal determines fine-scale spatial genetic structure of Mongolian gerbils

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Current Zoology 2017年第6期63卷 687-691页

作者： Guiming WANG Wei LIU Yanni WANG Xinrong WAN Wenqin ZHONG Department of Wildlife Fisheries and Aquaculture Mississippi State University Mail Stop 9690 Mississippi State MS 39762 USA Institute of Zoology Chinese Academy of Sciences State Key Laboratory of Integrated Management of Pest Insects and Rodents 1 Beichen West Road Chaoyang District Beijing 100101 China University of Chinese Academy of Sciences Beijing 100190 China College of Chemistry and Life Sciences Zhejiang Normal University 688 Yingbin Road Jinhua Zhejiang 321004 China

Restricted gene flow may cause positive spatial genetic autocorrelation of animal populations at fine spatial scales. The Mongolian gerbil is a territorial, social rodent. Territoriality may create social fences to restrict dispersal or gene flow of Mongolian gerbils to a short distance. Restricted dispersal may differentiate fine-scale spatial genetic structure of populations with increasing distances (i.e., isolation by distance [IBD]). Competition for mates and inbreeding avoidance may result in equal dispersal propensity and subsequently similar spatial genetic autocorrelation between males and females of monogamous gerbils. We genotyped 327 gerbils, live captured from 26 burrow systems on a 9-ha plot in northcentral Inner Mongolia, China, using seven microsatellite loci. Spatial genetic autocorrelation was positive within 80 m and became negative from 80 m to 200 m, suggesting restricted gene flow. Inter-group genetic and geographic distances were related positively, supporting the IBD model. Live trapping data demonstrated equal dispersal propensities of male and female gerbils. Restricted dispersal and social organization may determine fine-scale spatial population genetic structure of social rodents.

关键词： Meriones unguiculatus dispersal isolation by distance microsatellite analysis social rodents spatial genetic autocorrelation

Temperature and precipitation,but not geographic distance,explain genetic relatedness among populations in the perennial grass Festuca rubra

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Journal of Plant Ecology 2019年第4期12卷 730-741页

作者： MariaŠurinová Věroslava Hadincová Vigdis Vandvik Zuzana Münzbergová Department of Botany Faculty of ScienceCharles UniversityPragueCzech Republic Institute of Botany Academy of Sciences of the Czech RepublicPrůhoniceCzech Republic Department of Biology University of BergenBergenNorway Bjerknes Centre for Climate Research BergenNorway

Aims Knowledge of genetic structure of natural populations and its determinants may provide key insights into the ability of species to adapt to novel environments.In many genetic studies,the effects of climate could not be disentangled from the effects of geographic proximity.We aimed to understand the effects of temperature and moisture on genetic diversity of populations and separate these effects from the effects of geographic distance.We also wanted to explore the patterns of distribution of genetic diversity in the system and assess the degree of clonality within the populations.We also checked for possible genome size variation in the system.Methods We studied genetic variation within and among 12 populations of the dominant grass Festuca rubra distributed across a unique regional-scale climatic grid in western Norway,Europe and explored the importance of temperature,precipitation and geo-graphic distance for the observed patterns.We also explored the distribution of genetic diversity within and among popula-tions,identified population differentiation and estimated degree of clonality.The analyses used microsatellites as the genetic marker.The analyses were supplemented by flow cytometry of all the material.Important Findings All the material corresponds to hexaploid cytotype,indicating that ploidy variation does not play any role in the system.The results indicate that temperature and precipitation were better predictors of genetic relatedness of the populations than geographic distance,suggesting that temperature and precipitation may be important determinants of population differentiation.In addition,precipitation,alone and in interaction with temperature,strongly affected population genotypic diversity suggesting increased clonality towards the coldest and especially the coldest wettest climates.At the same time,individuals from the coldest and wettest climates also had the high-est individual genetic diversity,suggesting that only the most hetero-zygous individuals survive under these harsh climates.M

关键词： AMOVA hexaploid isolation by distance isolation by environment microsatellites Poaceae fuzzy clustering

A statistical procedure to assess the significance level of barriers to gene flow

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Journal of Genetics and Genomics 2009年第11期36卷 685-693页

作者： Sébastien Rioux Paquette Franois-Joseph Lapointe Allan Wilson Centre for Molecular Ecology & School of Biological Sciences Victoria University of Wellington Département de Sciences Biologiques Université de Montréal

Although several methods are available to study the extent of isolation by distance （IBD） among natural populations, comparatively few exist to detect the presence of sharp genetic breaks in genetic distance datasets. In recent years, Monmonier＇s maximum-difference algorithm has been increasingly used by population geneticists. However, this method does not provide means to measure the statistical significance of such barriers, nor to determine their relative contribution to population differentiation with respect to IBD. Here, we propose an approach to assess the significance of genetic boundaries. The method is based on the calculation of a multiple regression from distance matrices, where binary matrices represent putative genetic barriers to test, in addition to geographic and genetic distances. Simulation results suggest that this method reliably detects the presence of genetic barriers, even in situations where IBD is also significant. We also illustrate the methodology by analyzing previously published datasets. Conclusions about the importance of genetic barriers can be misleading if one does not take into consideration their relative contribution to the overall genetic structure of species.

关键词： genetic barriers genetic distances isolation by distance multiple regression on distance matrices partial regression coefficients

Spatial isolation and genetic differentiation in naturally fragmented plant populations of the Swiss Alps

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Journal of Plant Ecology 2008年第3期1卷 149-159页

作者： Patrick Kuss AndreaRPluess Hafdı´s HannaÆgisdottir Jurg Stocklin Institute of Botany University of BaselSchonbeinstrasse 6CH-4056BaselSwitzerland Institute of Plant Sciences University of BernAltenbergrain21CH-3013BernSwitzerland Institute for Terrestrial Ecosystems Ecosystem ManagementETH ZurichUniversitatstrasse 168092 ZurichSwitzerland

The effect of anthropogenic landscape fragmentation on the genetic diversity and adaptive potential of plant populations is a major issue in conservation biology.However,little is known about the partitioning of genetic diversity in alpine species,which occur in naturally fragmented habitats.Here,we investigate molecular patterns of three alpine plants(Epilobium fleischeri,Geum reptans and Campanula thyrsoides)across Switzerland and ask whether spatial isolation has led to high levels of population differentiation,increasing over distance,and a decrease of within-population variability.We further hypothesize that the contrasting potential for long-distance dispersal(LDD)of seed in these species will considerably influence and explain diversity partitioning.Methods For each study species,we sampled 20–23 individuals from each of 20–32 populations across entire Switzerland.We applied Random Amplified Polymorphic Dimorphism markers to assess genetic diversity within(Nei’s expected heterozygosity,He;percentage of polymorphic bands,Pp)and among(analysis of molecular variance,Ust)populations and correlated population size and altitude with within-population diversity.Spatial patterns of genetic relatedness were investigated using Mantel tests and standardized major axis regression as well as unweighted pair group method with arithmetic mean cluster analyses and Monmonier’s algorithm.To avoid known biases,we standardized the numbers of populations,individuals and markers using multiple random reductions.We modelled LDD with a high alpine wind data set using the terminal velocity and height of seed release as key parameters.Additionally,we assessed a number of important life-history traits and factors that potentially influence genetic diversity partitioning(e.***.breeding system,longevity and population size).Important findings For all three species,we found a significant isolation-by-distance relationship but only a moderately high differentiation among populations(Ust:22.7,14.8 and 16.8%,for E.fleischeri,G.reptans and C

关键词： Campanula thyrsoides Epilobium fleischeri Geum reptans isolation by distance molecular diversity

Restricted gene flow determines fine-scale genetic structure of group living Meriones unguiculatus

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Restricted gene flow determines fine-scale genetic structure...