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 S eifert’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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