Saratov
IvanovG.A.Saratov State University, 33 Astrakhanskaya Str., Saratov 410012, Russiaecoton@rambler.ru
TabachishinV.G.Saratov branch of A. N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 24 Rabochaya Str., Saratov 410028Tabachishinvg@sevin.ru
YermokhinM.V.Saratov State University, 33 Astrakhanskaya Str., Saratov 410012, Russiaecoton@rambler.ru
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