Shallow coastal zones may provide cross-habitat nutrient subsidies for benthic communities offshore, as macrophyte matter can drift to deeper sediments. To study the relative importance of carbon and nutrient flows derived from different primary food sources in a coastal ecosystem, the diets of clam Macoma balthica, polychaete Marenzelleria spp. and mussel Mytilus trossulus were examined across environmental gradients in the northern Baltic Sea using a triple-isotope approach (i.e. ¹³C, ¹⁵N and ³⁴S) and Bayesian mixing models (MixSIAR). Our results suggest that in shallow habitats, production from Fucus vesiculosus is the primary energy source for M. balthica. The proportion of macroalgae-derived matter in the diet of M. balthica and Marenzelleria spp. decreased following a depth gradient. Our models for M. trossulus indicate that the pelagic POM dominates its diet. Our results indicate a trophic connectivity between shallow macrophyte-dominated and deeper habitats, which receive significant amounts of nutrient subsidies from shallower areas.

浅海沿海地区可能为近海底栖生物群落提供跨生境的营养补贴，因为大型植物物质可能会漂移到更深的沉积物中。为了研究碳，并从不同的主食物来源在沿海生态系统衍生营养素流的相对重要性，蛤的饮食Macoma balthica，多毛类Marenzelleria属。使用三重同位素方法（即¹³ C，¹⁵ N和³⁴ S）和贝叶斯混合模型（MixSIAR），在波罗的海北部和环境中对贻贝和贻贝贻贝进行了研究。我们的研究结果表明，在浅层生境中，来自墨角藻的生产是捕捞的主要能源。巴尔提卡木（M. balthica）。海藻的衍生物质在饮食中的比例M. balthica和Marenzelleria属。随深度梯度减小。我们的trosssulus模型表明，中上层POM在其饮食中占主导地位。我们的结果表明，以浅层植物为主的栖息地与较深的栖息地之间存在营养联系，这些栖息地从较浅的区域获得了大量的营养补贴。