Slightly lost bumblebees use scent to find their way home frontiersin frontiersin
are not sufficiently reliable," said first author Sonja Eckel, a Ph.D. student at the Department of Neurobiology of Bielefeld University in Germany.Eckel and colleagues studied the homing behavior of the buff-tailed bumble bee Bombus terrestris in the laboratory. In nature, these bumble bees nest in abandoned mouseholes, hidden under grass or leaves.
Bumble bees possess multiple scent glands, which distribute chemicals all over their body. Previous research has shown that whenever they touch any surface, for example that of their nest entrance, they passively leave scent marks. The researchers captured these scent marks by placing a glass ring around the entrance, which foragers tended to walk across when exiting or returning to the nest.
The researchers measured how long, and at which distance, returning foragers hovered around either false location for the entrance, based on the conflicting landmarks. They assumed that the longer a forager hovered around any spot, and the smaller her average flight distance to it, the more focused she was in that spot as the best candidate for the entrance's location.
Typically, foragers seemed equally focused on either false location, implying that they used both sets of visual landmarks to unsuccessfully try and relocate their nest. But a occurred whenever the researchers placed the glass ring—carrying bumble bee scent marks—around either location. Now, foragers overwhelmingly focused on the false location suggested by the scent marks.use their sense of smell as well as vision to find their way home, in particular when visual information is conflicting.
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