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Feeding habits of Ictalurus punctatus in the downstream section of Nunome Dam reservoir in Japan
Landscape and Ecological Engineering ( IF 2 ) Pub Date : 2021-05-25 , DOI: 10.1007/s11355-021-00463-w
Kaori Kochi , Makoto Kobayashi , Sora Hirotaka

Invasive alien species often affect native ecosystems worldwide. In Japan, the channel catfish Ictalurus punctatus is an invasive species in rivers. However, information regarding its feeding habits in rivers around dam reservoirs is still scarce. Thus, in this study, we assessed the feeding habits of I. punctatus collected from the Nunome River, a secondary tributary of the Yodo River, downstream of the Nunome Dam reservoir. Standard length and weight of the collected individuals were measured, and their stomach contents were analyzed under a stereomicroscope to identify prey species. Moreover, stable isotope analysis was conducted to determine their trophic niche. Overall, I. punctatus was shown to feed on a variety of food resources derived from the riparian forest and river ecosystem; in particular, algae represented 78.8% of its stomach contents. However, stable isotope analysis suggested that I. punctatus depended on benthic insects and fish to ensure adequate body composition, whereas algae were not assimilated by I. punctatus. Among benthic insects, I. punctatus relied on trichopteran larvae such as Macrostemum radiatum, which appears downstream of the dam reservoir and utilizes plankton algae from the dam. In conclusion, these findings provide additional clues for a better understanding of I. punctatus feeding activity and its relationship with its surrounding ecosystem.



中文翻译:

日本努农大坝水库下游河豚的摄食习性

外来入侵物种通常会影响全世界的原生生态系统。在日本,河豚catIctalurus punctatus是河流中的一种入侵物种。但是,有关在大坝水库周围河流中的摄食习惯的信息仍然很少。因此,在这项研究中,我们评估了从努努姆大坝水库下游淀河次要支流努努姆河收集的马尾的摄食习性。测量收集到的个体的标准长度和体重,并在体视显微镜下分析他们的胃内容物,以识别猎物种类。此外,进行了稳定的同位素分析以确定其营养位。总体而言,马unc被证明以河岸森林和河流生态系统中的各种粮食资源为食;特别是藻类占其胃内容物的78.8%。但是,稳定的同位素分析表明,马尾藻依靠底栖昆虫和鱼类来确保适当的身体成分,而藻类并未被马尾藻吸收。间底栖昆虫,I.毛虫依靠trichopteran幼虫如Macrostemum radiatum,出现的坝水库下游并且利用浮游生物藻类从水坝。总之,这些发现为更好地了解马尾鱼的摄食活动及其与周围生态系统的关系提供了其他线索。

更新日期:2021-05-25
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