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第五届国际自动控制联合会分数阶导数及其应用会议

作者： Mark M.Meerschaert peter straka Yuzhen Zhou Robert J.McGough Department of Statistics and Probability Michigan State UniversityEast Lansing MI 48824 Department of Statistics and Probability Michigan State University East Lansing MI 48824 Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48824

＜正＞Fractional lossy wave equations have been proposed by Caputo（1967）,Szabo（1995）,Chen et al.（2004）,and Kelly et al.（2008）.These equations capture the power-law attenuation with frequency observed in many e... 详细信息

关键词： Fractional derivative wave equation ultrasound continuous time random walk subordination attenuation dispersion. Wave equation Travel time Random walk Acoustic Wave Power law KELLY inhomogeneous media

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Northwestward range expansion of the bumblebee Bombus haematurus into Central Europe is associated with warmer winters and niche conservatism

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Insect Science 2021年第3期28卷 861-872页

作者： Paolo Biella Aleksandar Cetkovic Andrej Gogala Johann Neumayer Miklos Sarospataki peter Sima Vladimir Smetana Department of Biotechnology and Biosciences University of Milano-BicoccaMilanoItaly Faculty of Biology University of BelgradeBelgradeSerbia Department of Invertebrate Zoology Slovenian Museum of Natural HistoryLjubljanaSlovenia Obergrubstrafie ElixhausenAustria Department of Zoology and Ecology Szent Istvan UniversityGodolloHungary Department of Research and Development Koppert s.r.o.Nove ZamkySlovakia Department of Natural History Tekov MuseumLeviceSlovakia

Species range expansions are crucial for understanding niche formation and the interaction with the ***,we studied the bumblebee Bombus haematurus Kriechbaumer,1870,a species historically distributed from northern Serbia through northern Iran which has very recently started expanding northwestward into Central Europe without human-mediated dispersal(i.e.,it is a natural spread).After updating the global distribution of this species,we investigated if niche shifts took place during this range expansion between newly colonized and historical *** addition,we have explored which climatic factors may have favored the natural range expansion of the *** results indicated that Bombus haematurus has colonized large territories in 7 European countries outside the historical area in the period from the 1980s to 2018,a natural expansion over an area that equals 20%of the historical *** addition,this bumblebee performs generalism in flower visitation and it occurs in different habitats,although a preference for forested areas clearly *** land-use associated with the species in the colonized areas is similar to the historical distribution,indicating that no major niche shifts occurred during the ***,in recently colonized localities,the range expansion was associated with warming temperatures during the winter and also during both queen overwintering and emergence *** findings document a case of natural range expansion due to environmental change rather than due to niche shifts,and specifically they suggest that warmer winters could be linked to the process of natural colonization of new areas.

关键词： climate change insect conservation niche conservatism niche shift pollinator range expansion

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