Abstract Nutrient availability in prey items can have important consequences for the growth, reproduction, survival, and recruitment into adulthood of juvenile fish. For young of the year sturgeon, which are highly dependent on macroinvertebrates as prey, knowing the nutritional content across various prey items within their habitats can help managers during habitat restoration. The objective of this study was to test for differences in the macronutrient composition of major invertebrate groups commonly consumed by young of the year sturgeon in the lower Missouri River in the summer, when sturgeon habitat assessments occur. Potential prey vary considerably in size. In addition, there were significant differences in the concentrations of nutrients. The lowest concentration of lipid was found in Odonata (2.36 ± 1.83 mg 100 mg−1; mean ± pooled variance standard error) and the highest was in Diptera (14.49 ± 3.30 mg 100 mg−1). The lowest concentration of protein was found in Ephemeroptera (58.98 ± 1.90 mg 100 mg−1) and the highest concentration was in Trichoptera (70.07 ± 3.26 mg 100 mg−1). Some spatial differences were found in energy derived from protein in Ephemeroptera in the lower Missouri River, but not in energy derived from lipid. Our findings provide useful information that can contribute to adaptive management efforts for sturgeons in the lower Missouri River.

中文翻译：

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密苏里河下游可用作幼年鲟鱼的常见水生大型无脊椎动物的常量营养素含量差异

摘要 猎物的营养可用性对幼鱼的生长、繁殖、存活和成年期招募产生重要影响。对于高度依赖大型无脊椎动物作为猎物的年度鲟鱼来说，了解栖息地内各种猎物的营养成分可以帮助管理人员恢复栖息地。本研究的目的是测试夏季鲟鱼栖息地评估发生时，夏季密苏里河下游鲟鱼幼鱼通常食用的主要无脊椎动物群的常量营养素组成的差异。潜在猎物的大小差异很大。此外，营养物质的浓度存在显着差异。在 Odonata 中发现了最低的脂质浓度 (2.36 ± 1.83 mg 100 mg−1; 平均值±合并方差标准误差），最高的是双翅目（14.49±3.30mg 100mg-1）。在蜉蝣目中发现了最低浓度的蛋白质 (58.98 ± 1.90 mg 100 mg-1)，在毛翅目中发现了最高浓度 (70.07 ± 3.26 mg 100 mg-1)。在来自密苏里河下游蜉蝣目蛋白质的能量中发现了一些空间差异，但在来自脂质的能量中没有发现。我们的发现提供了有用的信息，有助于对密苏里河下游鲟鱼的适应性管理工作。在来自密苏里河下游蜉蝣目蛋白质的能量中发现了一些空间差异，但在来自脂质的能量中没有发现。我们的发现提供了有用的信息，有助于对密苏里河下游鲟鱼的适应性管理工作。在来自密苏里河下游蜉蝣目蛋白质的能量中发现了一些空间差异，但在来自脂质的能量中没有发现。我们的发现提供了有用的信息，有助于对密苏里河下游鲟鱼的适应性管理工作。