Hollands Georgina, Snaddon Jake L, Newland Philip L, Sharkh Suleiman M
Mechatronics Research Group, Mechanical Engineering, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK.
School of Geography and Environmental Science, Highfield Campus, University of Southampton, Southampton SO17 1BJ, UK.
J Exp Biol. 2025 Jul 1;228(13). doi: 10.1242/jeb.250057. Epub 2025 Jul 4.
Over the past few decades there has been an overall decline in the number of pollinators, including wild bees, partly due to stress factors such as the availability of food resources, nest site availability and pesticide usage. Managed honey bees have also been negatively impacted in certain regions, such as the USA. One of the major stress factors facing bees currently is land use change, where natural landscapes are decreasing and often converted to either agricultural or urban land. Here, we assess directly the link between landscape diversity, edge density and honey bee learning, by analysing how honey bee visual learning ability varies across different landscapes, using a field-adapted version of the proboscis extension response. It was previously thought that honey bees from hives based in different landscapes may vary in visual learning abilities because of their different experiences and neural plasticity. Thus, bees that have experience in more complex learning environments may do better in learning tasks. To test this, bees were taught to associate a coloured yellow paper strip with a positive sugar reward and a blue coloured strip with a negative salt reward. Results showed that as edge density increased in the landscape, visual learning in bees reduced, and when landscape diversity increased, so did learning. This is important as bees must learn foraging routes, find profitable flowers and develop spatial maps, as well as recognise intruders. If their cognitive abilities are reduced and they are unable to carry out these tasks, this will be detrimental for the continuous development of the colony.
在过去几十年里,包括野生蜜蜂在内的传粉者数量总体呈下降趋势,部分原因是食物资源可获得性、筑巢地点可获得性和农药使用等压力因素。人工饲养的蜜蜂在某些地区也受到了负面影响,比如美国。目前蜜蜂面临的主要压力因素之一是土地利用变化,自然景观正在减少,且常常被转变为农业用地或城市用地。在此,我们通过分析蜜蜂的视觉学习能力在不同景观中的变化情况,利用一种适用于野外的喙伸反应版本,直接评估景观多样性、边缘密度与蜜蜂学习之间的联系。此前人们认为,来自不同景观中蜂巢的蜜蜂视觉学习能力可能因经历和神经可塑性不同而有所差异。因此,在更复杂学习环境中有经验的蜜蜂在学习任务中可能表现得更好。为了验证这一点,研究人员训练蜜蜂将黄色纸条与正向的糖分奖励联系起来,将蓝色纸条与负向的盐分奖励联系起来。结果表明,随着景观中边缘密度的增加,蜜蜂的视觉学习能力下降,而当景观多样性增加时,学习能力也随之提高。这一点很重要,因为蜜蜂必须学习觅食路线、找到有收益的花朵并绘制空间地图,还要识别入侵者。如果它们的认知能力下降且无法完成这些任务,这将对蜂群的持续发展不利。
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