Trophic dynamics and conceptual niche spaces of top piscivores were assessed using stable isotope analysis following the introduction of hybrid striped bass Morone saxatilis (Walbaum) × Morone chrysops (Rafinesque) into an established reservoir fishery devoid of gizzard shad, Dorosoma cepedianum (Lasueur). Hybrid striped bass were initially stocked into Three Mile Lake, Iowa as an attempt to biologically control pervasive yellow bass, Morone mississippiensis Jordan & Eigenmann, populations. From the analyses, it concluded that hybrid striped bass predominately targeted prey fish located in the littoral habitats of the reservoir and did not selectively consume yellow bass as intended. Bayesian isotope mixing models described the diets of hybrid striped bass to include a variety of prey fish, predominantly consisting of young bluegill Lepomis macrochirus and yellow bass. Food resource overlap among hybrid striped bass, largemouth bass, Micropterus salmoides Lacépède, and walleye, Sander vitreus (Mitchill), appeared substantial based on the isotopic niche overlap model. Results from this case study, in conjunction with the hindsight that yellow bass populations became prolific even with stockings of hybrid striped bass, suggest that their use to control yellow bass populations may not be a viable management strategy in southern Iowa.

中文翻译：

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引入顶级捕食者后水库渔业的营养动力学：来自稳定碳和氮同位素的见解

营养动力学和顶部piscivores的概念性利基空间进行了评估使用稳定同位素分析后，采用混合的条纹低音诸根鲈（大麻哈鱼）×诸根虻（Rafinesque）插入肫鲱的既定水库渔业缺乏，Dorosoma cepedianum（Lasueur）。混合条纹鲈鱼最初被放到爱荷华州的三英里湖中，以试图通过生物方式控制无处不在的黄色鲈鱼Morone mississippiensis乔丹和艾根曼，人口。从分析中得出的结论是，混合条纹鲈鱼主要是针对位于水库沿岸栖息地的猎物，没有选择性地消耗黄色鲈鱼。贝叶斯同位素混合模型描述了混合条纹鲈鱼的饮食，其中包括各种猎物，主要由幼小蓝blue Lepomis macrochirus和黄色鲈鱼组成。混合条纹鲈鱼，大嘴鲈鱼，Salmoides MicroceterusLacépède和角膜白斑，Sander vitreus之间的食物资源重叠（Mitchill）基于同位素生态位重叠模型显得很重要。该案例研究的结果，再加上事后看来，即使混合条纹鲈鱼都有黄鲈种群也能繁殖，这表明在爱荷华州南部，使用它们控制黄鲈种群可能不是可行的管理策略。