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The foraging activity of bumblebee(Bombus terrestis L.) relation to colony ventilation under high temperature condition in a greenhouse
We investigated pollination properties of bumblebees in a high temperature condition i. e. a greenhouse where onions(Aliumcepa) were cultivated. Foraging activity of bumblebee workers decreased at temperature over 33 ℃ and was negativelycorrelated with colony temperature. Fanning behavior was observed at temperature over 30 ℃ and was positively correlatedwith colony temperature. There was negative correlation between the number of bees fanning and bees foraging. We expectedthat foraging activity would be affected by colony temperature and fanning behavior. The temperature of the coloniesthat were ventilated using the cooler fan was 3 ℃ lower than the control colonies, and the rate of fanning behaviorwere 9 times lower in ventilated colonies than in the control colonies. Foraging activity and survival rates of workerbees in ventilated colonies doubled compared to the control colonies
