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- W2034802480 abstract "Habitat fragmentation alters the spatial and temporal distribution of floral resources in farmland. This will affect the foraging behaviour of bees utilising these resources and consequently pollen flow within and between patches of flowering plants. One element of bees’ foraging behaviour, which is likely to be affected, is the degree to which individual bees remain constant to a particular site or patch, both within and between foraging trips. Mark-re-observation was used to investigate whether foraging bumble bees showed site constancy over several days to regular patches of forage, even when those patches contained qualitatively and quantitatively similar resources. The authors also investigated whether site constancy was affected by the arrangement of patches within the area. The experimental arena was a field of barley containing patches of a grass/herb mixture, including Centaurea nigra L. (black knapweed) which provided nectar and pollen for bumble bees, particularly Bombus lapidarius L. Patches were either contiguous or non-contiguous in patch groups. Twenty to 28% of marked B. lapidarius were re-observed in the experimental arena during the week following marking. The number of re-observations of bees decreased over time probably because floral density decreased, the bees sought alternative forage elsewhere or they died from natural causes. The bees showed striking site constancy: 86–88% of re-observations were constant to patch group (27×27m2 or 45×45m2) and fewer re-observations were constant to small patches (9×9m2) within a patch group. Most observed moves were to patches or patch groups adjacent to those on which the bumble bees were marked. There was limited evidence that bumble bees were more constant to 9×9m2 patches surrounded by barley (70–73% of re-observations were patch constant) than to 9×9m2 patches that were contiguous (20–50% of re-observations were patch constant). The implications of the observed bumble bee site constancy for plant gene flow in the arable ecosystem are discussed." @default.
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- W2034802480 date "2001-01-01" @default.
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- W2034802480 title "Site constancy of bumble bees in an experimentally patchy habitat" @default.
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- W2034802480 doi "https://doi.org/10.1016/s0167-8809(00)00262-0" @default.
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