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Colony Volatiles and Substrate-borne Vibrations Entrain Circadian Rhythms and Are Potential Cues Mediating Social Synchronization in Honey Bee Colonies.
Journal of Biological Rhythms ( IF 3.5 ) Pub Date : 2020-04-15 , DOI: 10.1177/0748730420913362
Oliver Siehler 1 , Guy Bloch 1, 2
Affiliation  

Internal circadian clocks organize animal behavior and physiology and are entrained by ecologically relevant external time-givers such as light and temperature cycles. In the highly social honey bee, social time-givers are potent and can override photic entrainment, but the cues mediating social entrainment are unknown. Here, we tested whether substrate-borne vibrations and hive volatiles can mediate social synchronization in honey bees. We first placed newly emerged worker bees on the same or on a different substrate on which we placed cages with foragers entrained to ambient day-night cycles, while minimizing the spread of volatiles between cages. In the second experiment, we exposed young bees to constant airflow drawn from either a free-foraging colony or a similar-size control hive containing only heated empty honeycombs, while minimizing transfer of substrate-borne vibrations between cages. After 6 days, we isolated each focal bee in an individual cage in an environmental chamber and monitored her locomotor activity. We repeated each experiment 5 times, each trial with bees from a different source colony, monitoring a total of more than 1000 bees representing diverse genotypes. We found that bees placed on the same substrate as foragers showed a stronger phase coherence and a phase more similar to that of foragers compared with bees placed on a different substrate. In the second experiment, bees exposed to air drawn from a colony showed a stronger phase coherence and a phase more similar to that of foragers compared with bees exposed to air from an empty hive. These findings lend credence to the hypothesis that surrogates of activity entrain circadian rhythms and suggest that multiple social cues can act in concert to entrain social insect colonies to a common phase.

中文翻译:

菌落挥发物和底物传播的振动会引起昼夜节律,并且是介导蜜蜂菌落社会同步的潜在线索。

内部生物钟组织动物的行为和生理,并受到与生态有关的外部时间给予者的控制,例如光和温度循环。在高度社交性的蜜蜂中,社交时事者很有效,可以克服光合症,但是调解社交性诱因的线索尚不清楚。在这里,我们测试了基质传播的振动和蜂巢挥发物是否可以介导蜜蜂的社交同步。首先,我们将新出现的工蜂放在相同或不同的基质上,并在笼子上放置了带觅食者的笼子,昼夜循环,同时最大程度地减少了笼子之间的挥发物扩散。在第二个实验中,我们使幼蜂暴露于来自自由觅食菌落或仅包含加热的空蜂窝的类似大小的对照蜂巢的恒定气流,同时最大程度地减少了保持架之间的基底传播的振动传递。6天后,我们将每只局灶性蜜蜂隔离在环境室内的一个笼子里,并监测其运动能力。我们将每个实验重复了5次,每个实验都使用了来自不同来源菌落的蜜蜂,总共监测了代表不同基因型的1000多只蜜蜂。我们发现,与放置在不同基底上的蜜蜂相比,放置在与觅食者相同的底物上的蜜蜂表现出更强的相位相干性,并且相位更类似于觅食者。在第二个实验中,与暴露在空蜂房中的蜜蜂相比,暴露于从菌落中抽出的蜜蜂表现出更强的相干性,并且其相位与觅食者更相似。
更新日期:2020-04-21
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