Interglacial refugia and range shifts of the alpine grasshopper <Emphasis Type="Italic">Stenobothrus cotticus</Emphasis> (Orthoptera: Acrididae: Gomphocerinae) |
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Authors: | Dirk Berger Dragan P Chobanov Frieder Mayer |
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Institution: | 1.Institut für Biologie,Universit?t Erlangen-Nürnberg,Erlangen,Germany;2.Senckenberg Naturhistorische Sammlungen Dresden,Museum für Tierkunde,Dresden,Germany;3.Institute of Zoology,Bulgarian Academy of Sciences,Sofia,Bulgaria;4.Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversit?tsforschung an der Humboldt-Universit?t zu Berlin,Berlin,Germany |
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Abstract: | A warming climate leads to shifts in distribution ranges to higher latitudes and altitudes. Consequently, cold-adapted alpine
species can be trapped in interglacial Holocene refugia on high mountain summits if they fail to expand their ranges to the
north. One example is the alpine grasshopper Stenobothrus cotticus. This species was assumed to be endemic to the southwestern Alps (France, Italy). However, we have found a second refugium
in the Rila Mountains in southwestern Bulgaria. Analyses of the mitochondrial gene co1 and of phenotypic characters from morphology and behaviour did not reveal differences between the two geographically separated
populations of S. cotticus studied. We suppose that S. cotticus had a wider distribution during colder periods, when its range was expanded to lower altitudes. This hypothesis is supported
by the current distribution of the closely related montane S. rubicundulus. |
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