Multiple stressors across ecosystem boundaries: Do light pollution and invasive species change the quality of aquatic prey for terrestrial predators?

作者：Marina Arias, Gemma Burgazzi, Sebastian Pietz, Alessandro Manfrin, Verena Christina Schreiner, Collins Ogbeide, Florian Burgis, Anne Schrimpf, Thomas Schmidt, Eric Bollinger, R Schulz, Mirco Bundschuh · 发表于：Environmental Sciences Europe · 年份：2026 · DOI：10.1186/s12302-026-01345-4 · 被引用次数：3 · 研究领域：Impact of Light on Environment and Health、Isotope Analysis in Ecology、Animal Behavior and Reproduction

Abstract Background Freshwater ecosystems provide high-quality and essential fatty acids (FAs) to terrestrial food webs via aquatic emergent insects. Anthropogenic stressors, such as artificial light at night (ALAN) and invasive species, may disrupt these aquatic-terrestrial linkages by altering insect emergence and its nutritional quality for terrestrial predators, with cascading effects on terrestrial food webs. The interaction of these individual stressors may have non-additive impacts in the aquatic-terrestrial linkage, for example, by the direct effect of ALAN on the foraging activity of nocturnal invasive species (e.g., signal crayfish). We assessed the impact of ALAN, the invasive signal crayfish, and their interaction on the fluxes of FA via emergent insects, as well as their effect on the FA content in riparian spiders. We conducted a full factorial experiment between spring and summer (six weeks), employing a mesocosm facility composed of 16 artificial streams and adjacent riparian zones. Results The emergent biomass and FA fluxes were highest during the first week of the experiment in spring, and decreased over time. The presence of signal crayfish further reduced FA fluxes, while the FA content in spiders did not significantly differ among treatments. However, there was a tendency for an increased polyunsaturated FA content in spiders under ALAN, suggesting physiological consequences of the exposure to nocturnal illumination. Further, ALAN reduced signal crayfish ...