Benthic marine food webs, which recycle organic matter and sustain unique biodiversity, are an important component of estuarine Patagonian fjords; however, these may be heavily influenced by salmon farming activities. Under the above conditions, this study collected several food sources (sediment organic matter, suspended particulate organic matter, macroalgae) and 26 benthic invertebrate species, and analyzed them using a Bayesian mixing model. Briefly, carbon and nitrogen stable isotopes analyses revealed that the highly variable isotopic niche widths respond to food supplies from marine and terrestrial organic matter. In addition, particulate and dissolved waste from salmon farming activities were found to modify isotopic composition ratios in many suspension feeders. Particularly, our results indicate high δ¹⁵N values in the sponge Cliona chilensis and the encrusting coral Incrustatus comauensis, which appear to be potential ecological indicators for evaluating stoichiometry imbalances and trace organic pollution sources in fjord environments.

底栖海洋食物网循环利用有机物质并维持独特的生物多样性，是巴塔哥尼亚峡湾河口的重要组成部分；然而，这些可能受到鲑鱼养殖活动的严重影响。在上述条件下，本研究收集了几种食物来源（沉积物有机物、悬浮颗粒有机物、大型藻类）和 26 种底栖无脊椎动物，并使用贝叶斯混合模型对其进行了分析。简而言之，碳和氮稳定同位素分析表明，高度可变的同位素生态位宽度对海洋和陆地有机物质的食物供应有反应。此外，发现来自鲑鱼养殖活动的颗粒和溶解废物会改变许多悬浮饲养者的同位素组成比。特别是，我们的结果表明高 δ ¹⁵海绵Cliona chilensis和结壳珊瑚Incrustatus comauensis中的 N 值，这似乎是评估峡湾环境中化学计量失衡和痕量有机污染源的潜在生态指标。