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Bees (a.k.a. Apoidea Anthophila) are among the main pollinators in most ecosystems. The yearly value of the ecological services provided worldwide by pollinators reaches more than € 150 billion. As in many other groups, the erosion of bee diversity is now a well-assessed reality. However, quantification of the phenomenon, including the assessment of its extent and severity has been lacking for a long...
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