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Alarm pheromones do not mediate rapid shifts in honey bee guard acceptance threshold

journal contribution
posted on 2023-06-08, 05:14 authored by Margaret J Couvillon, Sarah N Barton, Jennifer A Cohen, Onna K Fabricius, Martin H Kärcher, Lee S Cooper, Matthew J Silk, Heikki Helanterä, Francis Ratnieks
Honey bee (Apis mellifera) guards discriminate nestmates from non-nestmates at the hive entrance. The acceptance threshold of guards is known to change adaptively, for example becoming less permissive when the number of intruder bees from other colonies increases. These adaptive shifts can occur within minutes. What is unknown is the mechanism behind this rapid shift. It was hypothesized that alarm pheromones released by guards may cause the adoption of a less permissive acceptance threshold. Here, we tested this hypothesis on five discriminator hives by using a behavioral assay. We used three amounts each of iso-pentyl acetate (IPA) and 2-heptanone (2H), which are the major components of the pheromones from the sting and the mandibular glands, respectively. Biologically relevant levels of chemicals were delivered to the hive entrance platform via an air pump. We found no effect of either IPA or 2H: there was no change in guard acceptance of either nestmate (on average, 91% accepted) or non-nestmate (on average, 30% accepted) under any of the pheromone treatments compared to the pentane control (98% nestmates accepted and 32% non-nestmates accepted). Therefore, we reject the hypothesis that the presence of IPA or 2H causes a rapid shift of guard acceptance threshold.

History

Publication status

  • Published

Journal

Journal of Chemical Ecology

ISSN

0098-0331

Publisher

Springer Verlag

Issue

12

Volume

36

Page range

1306-1308

Department affiliated with

  • Evolution, Behaviour and Environment Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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