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The species composition, nest density, structure and ecological profile of an ant community were studied within a transect encompassing the forest interior, forest edge and a belt-shaped clearing in a moist mixed pine forest habitat (Querco roboris-Pinetum) in the Kampinos Forest (Central Poland) in the context of direct and indirect human impact and the bioindicator importance of ants. Altogether, 19 ant species were found; the most abundant ones (in respect of number of nests) in the entire habitat under study were Temnothorax crassispinus (Karav.) and Myrmica rubra (L.). All analysed parameters of individual subcommunities, except for nest density (highest on the forest edge, lowest in the cleared belt), showed a gradient pattern of variability, with species richness and the index of general diversity increasing and the dominance index decreasing within the transect from the forest interior to the cleared belt. Differences between the two subcommunities from the forested area (forest interior and forest edge), both highly dominated by T. crassispinus, were, in every way, much smaller than those between either of them and the subcommunity from the cleared area, where M. rubra prevailed.
Myrmica schencki Em. and M. rubra (L.), common Palaearctic ant species, collect fallen male Scots pine (Pinus sylvestris L.) inflorescence during the pine blossom time, take it to their nests and then gather it on rubbish piles close to nest-entrances. Dissection of M. schencki workers revealed the presence of numerous pollen grains in their crops and midguts proving at least periodical pollenivory of these ants. So far, only some Neotropical ants of the genus Cephalotes Latr. have been known to eat pollen.
A colony of Myrmica rubra (L.) parasitised by the mermithid nematodes was found in Pieniny Mts (S Poland). About 25% of the adult workers were infested, and their body, apart from a visibly distended gaster, was modified to an extent previously unknown in mermithised Myrmica ants (shape of body parts, sculpture, pilosity). The morphology of infested and non-infested individuals was compared using standard measurements and indices employed in taxonomy of the genus Myrmica Latr. Mermithogenic modifications of body structure in Myrmica species are signalled to be the cause of the possible taxonomie problems and mistakes.
The paper contains a taxonomie review of 13 species of the genus Myrmica Latr. occurring in Poland with information on their geographical ranges, distribution in Poland and biology. The following species are under discussion: M. rubra (L.), M. ruginodis Nyl., M. sulcinodis Nyl., M. lobicornis Nyl., M. rugulosa Nyl., M. gallienii Bondr., M. hellenica For., M. specioides Bondr., M. scabrinodis Nyl., M. sabuleti Mein., M. lonae Finzi, M. hirsuta Elmes arid M. schencki Viereck. A key for identifying them on the basis of workers and males is included.
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