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Nests of red mason bees (Osmia bicornis L.) are inhabited by characteristic accompanying fauna, which to a varying extent restricts the development of the bee population. The aim of this research was to conduct a comparative analysis of nest material from four sites. At three sites artificial nests of common reed and bee cocoons were placed for the first time (M1 – Kłoda, Masovian Voivodeship, M2...
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