Diet of invasive pikeperch Sander lucioperca: developing non-destructive tissue sampling for stable isotope analysis with comparisons to stomach contents analysis
Diet of invasive pikeperch Sander lucioperca: developing non-destructive tissue sampling for stable isotope analysis with comparisons to stomach contents analysis
复制标题
侵入性梭鲈 Sander lucioperca 的饮食：开发用于稳定同位素分析的非破坏性组织取样并与胃内容物分析进行比较
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
J. R. Britton
中科院分区：
文献类型：
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作者：
E. T. Nolan;J. R. Britton
入侵性食鱼鱼类的影响评估通常依靠饮食分析来量化其对猎物群落的捕食压力。胃内容物分析 (SCA)，通常是一种破坏性取样方法，经常用于此目的。然而，许多入侵性食鱼动物都被捕捉后释放的钓鱼运动所利用，而破坏性采样通常是不可行的。稳定同位素分析 (SIA) 为 SCA 提供了一种替代饮食分析工具，使用鳍组织、鳞片和/或表皮粘液可能使其非破坏性应用成为可能。在这里，通过将 SIA 应用于一系列组织来研究梭鲈（一种英国的入侵运动鱼）种群的饮食。测试背肌（破坏性采样）与鳍、鳞片和粘液（非破坏性采样）的 SI 数据揭示了高度显着的关系，表明非破坏性收集的组织可以可靠地应用于梭鲈饮食评估。将这些 SI 数据应用于贝叶斯混合模型预测，随着 S. lucioperca 长度的增加，它们的饮食从大型无脊椎动物转向鱼类。尽管 SCA 中存在明显类似的个体发育模式，但 54% 的空腹鱼会抑制这种模式。然而，SCA 发现，随着 S. lucioperca 长度的增加，它们的猎物大小也显着增加。然而，猎物与捕食者的长度比介于 0.08 和 0.38 之间，表明大多数猎物相对较小。这些结果表明，当需要对运动鱼类的饮食分析进行无损采样时，可以使用鳍、鳞片和/或粘液应用 SIA。然而，在破坏性采样已经完成的情况下，SCA 可以提供补充性的饮食见解，尤其是与猎物大小相关的见解。
Impact assessments of invasive piscivorous fishes usually rely on dietary analyses to quantify their predation pressure on prey communities. Stomach contents analysis (SCA), typically a destructive sampling method, is frequently used for this. However, many invasive piscivores are exploited by catch-and-release sport angling, with destructive sampling often not feasible. Stable isotope analysis (SIA) provides an alternative dietary analysis tool to SCA, with use of fin tissue, scales and/or epidermal mucus potentially enabling its non-destructive application. Here, the diet of a population of pikeperch Sander lucioperca , an invasive sport fish to Great Britain, was investigated by applying SIA to a range of tissues. Testing SI data of dorsal muscle (destructive sampling) versus fin, scale and mucus (non-destructive sampling) revealed highly significant relationships, indicating that the tissues collected non-destructively can be reliably applied to pikeperch diet assessments. Application of these SI data to Bayesian mixing models predicted that as S. lucioperca length increased, their diet shifted from macro-invertebrates to fish. Although similar ontogenetic patterns were evident in SCA, this was inhibited by 54% of fish having empty stomachs. Nevertheless, SCA revealed that as S. lucioperca length increased, their prey size significantly increased. However, the prey:predator length ratios ranged between 0.08 and 0.38, indicating most prey were relatively small. These results suggest that when non-destructive sampling is required for dietary analyses of sport fishes, SIA can be applied using fin, scales and/ or mucus. However, where destructive sampling has been completed, SCA provides complementary dietary insights, especially in relation to prey size.