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Dine-in or take-away? Scavenging strategies in predaceous diving beetles at different water depths

文献类型： 外文期刊

作者： Wang, Leyun 1 ; Feng, Shiqian 3 ; Zhao, Zihua 4 ;

作者机构： 1.Guangxi Univ, Coll Agr, Guangxi Key Lab Agroenvironm & Agr Prod Safety, Nanning, Peoples R China

2.Guangxi Univ, Coll Agr, Natl Demonstrat Ctr Expt Plant Sci Educ, Nanning, Peoples R China

3.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Plant Dis & Insect Pests, Beijing, Peoples R China

4.China Agr Univ, Dept Plant Biosecur, Beijing, Peoples R China

5.China Agr Univ, Key Lab Surveillance & Management Plant Quarantine, Beijing, Peoples R China

6.Guangxi Univ, Coll Agr, Guangxi Key Lab Agroenvironm & Agr Prod Safety, Nanning 530004, Peoples R China

关键词： aquatic beetle; Coleoptera; conservation; diving beetle; Dytiscidae; Dytiscus sinensis; foraging; generalist carnivore; habitat suitability; respiration; scavenging strategy; wetland

期刊名称：ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA （ 影响因子：1.9； 五年影响因子：2.1 ）

ISSN： 0013-8703

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Predaceous diving beetle adults scavenge for carrion in freshwater habitats. We identified two scavenging strategies used by adult Dytiscus sinensis Feng (Coleoptera: Dytiscidae) to locate and consume food at the bottom of water when needing to surface for air store renewal: dine-in then relocate the food (dine-in strategy) and carry the food to the surface (take-away strategy). In 5-cm-deep water, a higher proportion of individuals successfully located food within an 8-min test window than in 25-cm-deep water. Their latencies to locating food did not differ among depths. Dytiscus sinensis adults preferred the take-away strategy in 5-cm-deep water and a higher proportion of them adopted the dine-in strategy in 25-cm-deep water. Further, a 10-cm-deep test showed that the success rate or efficiency of relocating food did not increase with the experience of locating it the first time. This might explain why D. sinensis preferred the take-away strategy in shallower water, in which it had lower risks of losing the food. The present study revealed a direct bottom-up benefit for dytiscids foraging in shallower water where finding and securing food were easier. Our findings demonstrate that the surfacing requirement of dytiscid adults was reflected in foraging strategies with depth-dependent preferences. We identified two foraging strategies in adult Dytiscus sinensis (Coleoptera: Dytiscidae): dine-in, then relocate the food, or take-away, carrying the food to the surface. Adults preferred the former strategy in deeper water and adopted the latter in shallower water in a higher proportion. Success rate and efficiency of relocating food after surfacing did not increase by their experience of locating it the first time. The surfacing requirement of dytiscid adults is reflected in foraging strategies with depth-dependent preferences.image

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