Recreational fishing, through groundbaiting, provides a potentially important trophic subsidy to freshwater ecosystems that could promote eutrophication. To date, our understanding of the role of bait properties on their fate when they are not consumed remains limited. The present study aimed to determine if the C:N:P composition of some of the most commonly used angling baits modulated microbial decomposition. The C:N:P composition of 28 models of four commercially available angling baits was assessed and a microcosm experiment was used to quantify microbial decomposition. Elemental composition strongly varied among angling baits, with N content varying by a factor of three and P content varying by a factor of five. Microbial decomposition of angling baits was highly variable and faster for more industrialised baits. Microbial decomposition was five times faster for angling baits rather than natural subsidies (leaves) and was not significantly correlated with high N or P content. Compared to natural subsidies, angling baits were a favourable substrate for bacterial growth. Angling baits represent a source of highly available nutrients and the most-enriched angling baits might affect ecological processes and water quality in ecosystems with high angling pressure, especially when their use is not regulated.

中文翻译：

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不同钓饵的元素组成及微生物分解

休闲捕鱼，通过地面诱饵，为淡水生态系统提供潜在的重要营养补贴，从而促进富营养化。迄今为止，我们对诱饵特性在不被消耗时对其命运的作用的理解仍然有限。本研究旨在确定一些最常用的钓鱼诱饵的 C:N:P 成分是否能调节微生物分解。评估了四种市售钓鱼诱饵的 28 个模型的 C:N:P 组成，并使用缩影实验来量化微生物分解。各种钓鱼诱饵的元素组成差异很大，N 含量变化了三倍，P 含量变化了五倍。对于更工业化的诱饵，钓鱼诱饵的微生物分解变化很大，而且速度更快。垂钓饵的微生物分解速度比自然补贴（叶子）快五倍，并且与高 N 或 P 含量没有显着相关性。与自然补贴相比，钓鱼诱饵是细菌生长的有利基质。垂钓饵是高可用营养物质的来源，最丰富的垂钓饵可能会影响垂钓压力高的生态系统中的生态过程和水质，尤其是在其使用不受监管的情况下。