Arctic regimes. Currently, warming accelerates the erosion of permafrost coasts and the associated discharge of sediment, carbon, and nutrients into the Arctic Ocean. However, the impacts of coastal erosion on planktonic food webs remain understudied. We aimed to (1) understand how coastal erosion impacts nearshore carbon, nutrient, and light regimes; (2) investigate the effects on primary production and energy transfer; and (3) predict how increased erosion will impact the productivity of consumers, and the overall food web interactions. We found that sediment discharge increases turbidity (darkening). This darkening is expected to hamper phytoplankton productivity, while additional carbon input will provide bacteria with direct energy sources, and shift the balance between basal autotrophic and heterotrophic production. Since the heterotrophic pathway has a lower efficiency, its dominance might negatively affect mesozooplankton. Increased Arctic coastal erosion might therefore influence planktonic food webs by changing mechanisms of energy mobilization and transfer to higher trophic levels.

中文翻译：

---

未来北极：日益加剧的海岸侵蚀将如何塑造近岸浮游食物网？


北极政权。目前，变暖加速了永久冻土海岸的侵蚀，以及随之而来的沉积物、碳和营养物质向北冰洋的排放。然而，海岸侵蚀对浮游食物网的影响仍未得到充分研究。我们的目标是 （1） 了解海岸侵蚀如何影响近岸碳、养分和光状况;（2） 研究对初级生产和能源转移的影响;（3） 预测侵蚀增加将如何影响消费者的生产力以及整体食物网互动。我们发现沉积物排放会增加浑浊度（变暗）。预计这种变暗将阻碍浮游植物的生产力，而额外的碳输入将为细菌提供直接的能量来源，并改变基础自养和异养生产之间的平衡。由于异养途径的效率较低，其优势可能会对中浮游动物产生负面影响。因此，北极海岸侵蚀的增加可能会通过改变能量动员和转移到更高营养级的机制来影响浮游生物食物网。