Abstract In this study, we analysed the diet of two populations of Perlodes intricatus (Pictet, 1841) inhabiting river sections characterised by different environmental quality. Macrobenthic communities and nymphal gut content data were acquired in a nearby pristine environment and in a station compromised by sewage discharges. No differences in size were detected between these populations. Both populations select positively Chironomidae as prey, but marked differences are evident between their diet. Nymphs from pristine station feed on a wide range of prey, but also include algae and organic detritus. By contrast, nymphs from polluted station show a different and restricted trophic spectrum, likely because of the reduced prey availability. Interestingly, the occurrence of fine organic detritus in these latter nymphs is much higher, evidencing a shift to a more collector-gatherer feeding. This study shows that some Perlodidae can survive and develop in contaminated environments, also due to their trophic plasticity.

中文翻译：

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有机污染和栖息地改变如何影响高山河流 Perlodes intricatus (Pictet, 1841) 的营养习性？

摘要 在这项研究中，我们分析了栖息在具有不同环境质量特征的河段的两个 Perlodes intricatus (Pictet, 1841) 种群的饮食。大型底栖动物群落和若虫肠道含量数据是在附近的原始环境和受污水排放影响的站点中获得的。在这些群体之间没有检测到大小差异。两个种群都积极选择摇蚊科作为猎物，但它们的饮食之间存在明显差异。原始站的若虫以各种猎物为食，但也包括藻类和有机碎屑。相比之下，来自污染站的若虫表现出不同且受限的营养谱，这可能是因为猎物可用性降低。有趣的是，这些后若虫中细小有机碎屑的发生率要高得多，证明转向更多的收集者 - 收集者喂养。这项研究表明，一些 Perlodidae 可以在受污染的环境中生存和发育，这也是由于它们的营养可塑性。