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Seasonal variation in the diet of the serotine bat (Eptesicus serotinus): A high-resolution analysis using DNA metabarcoding
Basic and Applied Ecology ( IF 3.8 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.baae.2020.09.004
Julia Tiede , Melanie Diepenbruck , Jürgen Gadau , Bernd Wemheuer , Rolf Daniel , Christoph Scherber

Abstract Bats play an important role as predators of insect populations but are threatened by a variety of factors, including the loss of foraging habitat and insect declines. Knowledge on trophic interactions, foraging strategies, and hunting areas is key to understanding the ecology of bat species, to assess their impact on ecosystems and to optimize conservation strategies. We investigated seasonal trends in the diet of two nursery colonies of the serotine bat, Eptesicus serotinus, from an intensively farmed agricultural landscape in Germany. Using DNA-metabarcoding of food remains in bat droppings collected from May to July 2018, we identified 254 taxa of 13 arthropod orders to species or genus level, including numerous pest species. Our results indicate an equal use of Coleoptera, Diptera, and Lepidoptera, contradicting previous morphological dietary analyses that had shown beetles to be the most frequent prey. The dietary composition was seasonally highly variable and mainly determined by prey phenology. Dietary richness significantly increased throughout the sampling period, reflecting increasing insect activity with progressing season. Our findings demonstrate that E. serotinus is a generalist forager, linking different habitat types through trophic interactions.

中文翻译:

血清素蝙蝠(Eptesicus serotinus)饮食的季节性变化:使用 DNA 元条形码的高分辨率分析

摘要 蝙蝠作为昆虫种群的捕食者发挥着重要作用,但受到多种因素的威胁,包括觅食栖息地的丧失和昆虫数量的减少。关于营养相互作用、觅食策略和狩猎区的知识是了解蝙蝠物种生态、评估它们对生态系统的影响和优化保护策略的关键。我们调查了来自德国一个集约化养殖的农业景观的血清素蝙蝠 Eptesicus serotinus 的两个育苗群的饮食季节性趋势。使用 2018 年 5 月至 7 月收集的蝙蝠粪便中食物残骸的 DNA 元条形码,我们确定了 13 个节肢动物目的物种或属水平的 254 个分类群,包括许多害虫物种。我们的结果表明对鞘翅目、双翅目和鳞翅目的同等利用,与之前的形态饮食分析相矛盾,这些分析表明甲虫是最常见的猎物。饮食成分季节性变化很大,主要由猎物物候决定。在整个采样期间,膳食丰富度显着增加,反映了随着季节的推进昆虫活动的增加。我们的研究结果表明,E. serotinus 是一种多面手觅食者,通过营养相互作用将不同的栖息地类型联系起来。
更新日期:2020-12-01
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