Nectar loads as fuel for collecting nectar and pollen in honeybees: adjustment by sugar concentration
Nectar loads as fuel for collecting nectar and pollen in honeybees: adjustment by sugar concentration
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DOI：
10.1007/s00359-016-1088-x
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发表时间：
2016-06-01
影响因子：
2.1
通讯作者：
Nakamura, Jun
中科院分区：
文献类型：
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作者：
Harano, Ken-ichi;Nakamura, Jun
当蜜蜂觅食者离开巢穴时，它们会从巢友那里接收花蜜，用作飞行燃料或作为增加花粉量的粘合材料。我们检查了从巢穴携带的花蜜浓度是否随着糖的需求而变化。我们发现花粉采集者的花蜜浓度 (61.8%) 比花蜜采集者 (43.8%) 更高。进一步的分析表明，在两组觅食者中，随着摇摆持续时间（食物源距离的指标），农作物负荷的糖浓度显着增加。作物体积也随着摆动持续时间而增加。结果支持了我们的论点，即当对糖的需求很高时，采集者会使用浓缩花蜜，并表明它们通过改变体积和花蜜浓度来精确调整作物中的糖含量。我们还调查了采集者接受花蜜的区域对出发时农作物负荷浓度的影响。尽管花蜜和花粉采集者倾向于在巢穴的不同区域加载花蜜，但区域对作物加载集中度没有显着影响。离开巢穴的觅食者在离开巢穴之前平均有 2.2 次短暂（< 1 秒）的乞求滋养接触。在这些接触过程中，它们可能会拒绝浓度不适当的花蜜。
When honeybee foragers leave the nest, they receive nectar from nest mates for use as fuel for flight or as binding material to build pollen loads. We examined whether the concentration of nectar carried from the nest changes with the need for sugar. We found that pollen foragers had more-concentrated nectar (61.8 %) than nectar foragers (43.8 %). Further analysis revealed that the sugar concentration of the crop load increased significantly with waggle duration, an indicator of food-source distance, in both groups of foragers. Crop volume also increased with waggle duration. The results support our argument that foragers use concentrated nectar when the need for sugar is high and suggest that they precisely adjust the amount of sugar in the crop by altering both volume and nectar concentrations. We also investigated the impact of the area where foragers receive nectar on the crop load concentration at departure. Although nectar and pollen foragers tend to load nectar at different areas in the nest, area did not have a significant effect on crop load concentration. Departing foragers showed an average of 2.2 momentary (< 1 s) begging trophallactic contacts before leaving the nest. They might be rejecting nectar with inappropriate concentrations during these contacts.