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Evidence for fine-scale habitat specialisation in an invasive weed

Journal of Plant Ecology 2018年第2期11卷 189-199页

作者： Daniel Z.Atwater Rebecca A.Fletcher Christopher C.Dickinson Andrew H.Paterson Jacob N.Barney Virginia Tech Department of Plant PathologyPhysiology and Weed Science435 Old Glade RoadBlacksburgVA 24061USA University of Georgia Plant Genome Mapping Laboratory111 Riverbend RoadAthensGA 30606USA

Aims As an exotic species colonises a new continent,it must overcome enormous environmental variation in its introduced *** adaptation of introduced species has frequently been observed at the continent scale,particularly in response to latitudinal climatic ***,significant environmental heterogeneity can also exist at the landscape scale.A small number of studies have provided evidence that introduced species may also be capable of phenotypic and genetic differentiation at much smaller spatial *** example,previously we found US agricultural and non-agricultural populations of Sorghum halepense(Johnsongrass)to be phenotypically and genetically *** this study,we inves-tigated whether this phenotypic differentiation of agricultural and non-agricultural populations of *** is the result of fine-scale local *** We surveyed a nationally collected *** germplasm panel and also collected neighbouring agricultural and non-agricultural sub-populations of *** at four sites throughout Western Virginia,USA,raising seedlings in common conditions mimicking both agricultural and non-agricultural *** Findings At the national scale,we found evidence of habitat differentiation but not ***,at the local scale,we found evi-dence of specialisation in two of the four local populations to non-agricultural habitat,but no evidence of specialisation to agricultural *** results show that local specialisation is a possible,but not guaranteed consequence of kilometre-scale habitat heterogen-eity in invasive *** finding contributes to a growing aware-ness of the importance of fine-scale local adaptation in the ecology and management of introduced and weedy species.

关键词： Johnsongrass local adaptation rapid evolution Sorghum halepense(L.)

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Geographical variation in germination traits of the salt-marsh cordgrass Spartina alterniflora in its invasive and native ranges

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Journal of Plant Ecology 2021年第2期14卷 348-360页

作者： Wen-Wen Liu Yi-Hui Zhang Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and EcologyXiamen UniversityFujian 361102China

Aims Germination is the earliest life-history transition of a plant *** determines the ecological breadth and geographic ranges of a species and has major effects on its invasion *** largest spread of the invasive salt-marsh cordgrass Spartina alterniflora in China,where it extends to latitudes lower than its native range in North America,provides an opportunity to examine germination trait variation across latitudes within and among its invasive and native *** We studied seed germination traits of *** using seeds collected from 10 locations across latitudes in its invasive range(China,20°–40°N)and 16 locations across latitudes in its native range(USA,27°–43°N)in growth chambers with 0 PSU sterilized distilled *** further evaluated how climate and tide range in the original locations influenced germination *** Findings Native populations showed higher(~10%)germination percentage and significantly higher(~20%)germination index than invasive populations did,but invasive populations germinated significantly earlier(~3 days)than native *** percentage and germination index increased with latitude in the invasive range but decreased with latitude in the native *** mean germination time decreased with latitude in the invasive range and paralleled that in the native *** percentage and germination index were negatively correlated with mean daily temperature(Tmean),mean daily maximum temperature(Tmax)and mean daily minimum temperature(Tmin),and inversely correlated with Tmean,Tmax and Tmin in the native ***,the mean germination time was positively correlated with Tmean,Tmax and Tmean in both *** results demonstrate that invasive and native populations have evolved different latitudinal clines in germination percentage and index,but the mean germination time of the invasive population mirrored the latitudinal cline observed in the native range,suggesting that germi

关键词： biological invasion establishment germination timing latitudinal clines rapid evolution

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