Overwintering ecology of two social halictine bees,Lasioglossum duplex andL. problematicum |
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Authors: | Sh?ichi F Sakagami Kazuo Hoshikawa and Hiromi Fukuda |
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Institution: | (1) Zoological Section, Institute of Low Temperature Science, Hokkaido University, 060 Sapporo, Japan;(2) Graduate School of Environmental Science, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | Summary Overwintering of two social halictine bees,Lasioglossum duplex (Dalla Torre) andL. problematicum (Blüthgen), was studied. InL. duplex many females stay near the old nests, each female preparing a hibernaculum separated from the natal nest. InL. problematicum most females overwinter communally within the natal nest. This difference in overwintering habits relates to the social structure
in the next spring.L. duplex is nearly always solitary in spring although later becoming eusocial, whereas many nests ofL. problematicum are polygynous, beginning in early spring.L. duplex overwinters much deeper (
) in the soil than doesL. problematicum (
), but both species are safe from drops in soil temperature, which is above 0°C even in midwinter, and the bees' supercooling
points are lower than −6°C. This cold resistance and the storage of sufficient food in the crop are reflected in the winter
survival, which is much higher (79%) than the rate of successful nests in the spring active phase (25%).
Bionomics of the eusocial halictine beeLasioglossum duplex VII.
Contribution No. 2654 from the Inst. Low Temp. Sci. |
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