Czechowski and Pisarski (1990) described the species composition and structure of ant communities of wooded patches (originally Tilio-Carpinetum) in Warsaw, situated along the Vistula river escarpment within the city. The paper was immediately succeeded by Seifert's (1991, 1992) taxonomic revision, where one of the most abundant species there, Lasius niger, was split into two sibling species: L. niger (L.) and L. platythorax Seifert, which clearly differ in their ecological requirements. Re-examination of the old material in the light of the present taxonomic knowledge showed that only L. niger, a polytope of moderately dry open habitats, was present in the study habitat. L. platythorax, a polytope of moderately wet forests, was lacking from urban wooded areas.
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