Effect of landscape enhancements on bumblebee queen in apple orchards

Poster session
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vendredi 20 déc. 11:30 AM (1 heure)
Dîner   12:30 PM à 01:30 PM (1 heure)
Salle ABCD
According to a global scientific consensus, wild pollinators are in decline. Several causes are pointed out, including the application of pesticides, the loss of floral diversity and the landscape simplification. Landscape enhancements (e.g. windbreaks, riparian strips, flower strips) installed in several orchards in Quebec could improve the habitat of pollinators in agricultural areas. Early flowering of apple trees greatly benefits from pollination by bumblebees, which, unlike other indigenous pollinators or honey bees, are more efficient and active earlier in the spring. We assume that orchards with landscape enhancements will have a greater number of species and greater abundance. In order to test this hypothesis, queens from 12 orchards (6 with and 6 without enhancements) were captured using the capture-marking-recapture method. A total of 4290 and 379 queens were respectively collected during 3 springs and 2 falls and represented by 9 different species. Year to year variation made it hard to detect an effect of landscape enhancements on bumblebee richness, but one was found for bumblebee abundance for some species.

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