Hypoxia induced by eutrophication and high summer temperatures is common in most Midwestern reservoirs, with uncertain effects on resident fishes. To evaluate the potential influence of low dissolved oxygen (DO) and high‐temperature conditions on habitat quality for three common sport fishes (Largemouth Bass Micropterus salmoides, saugeye [Walleye Sander vitreus × Sauger S. canadensis], and White Crappie Pomoxis annularis), we used spatially explicit bioenergetics models to measure growth rate potential (GRP) in three Ohio reservoirs of varying productivity and size. Dissolved oxygen, temperature, and prey biomass data were collected throughout each study reservoir during August in 2015 or 2016, when temperature and hypoxia levels were expected to be at or near their peak. Growth rate potential was generally low in hypoxic bottom waters and higher in the epilimnion due to prey concentrating above the oxycline. The amount of high‐quality habitat (HQH; i.e., GRP > 0 g/g/d) always declined owing to hypoxia; however, the extent of the decline depended on the modeled species and reservoir. Among species, hypoxia‐induced losses of HQH were small, differing by less than 8% in each reservoir. Among‐reservoir differences in HQH were greater; reductions in HQH ranged from 31.3% to 42.5% among species in the reservoir with the lowest DO (mean ± SE = 2.7 ± 0.04 mg/L) and highest gape‐appropriate prey biomass (5.1 ± 0.07 to 5.3 ± 0.07 g/m³), whereas they varied by 0.3–0.6% in the reservoir with the highest DO (5.1 ± 0.07 mg/L) and lowest gape‐appropriate prey biomass (0.2 ± 0.004 to 0.6 ± 0.01 g/m³). Even so, the reservoir with the lowest mean DO (i.e., greatest hypoxic extent) had the highest mean GRP and percentage HQH owing to high prey biomass. Collectively, our findings indicate that bottom hypoxia can reduce sport fish habitat quality in temperate reservoirs, but high prey biomass may mitigate the negative effect of hypoxia.

中文翻译：

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低氧对水库大口黑鲈，Saugeye和White Crappie栖息地质量的影响

富营养化和夏季高温造成的缺氧在中西部大多数水库中很常见，对居民鱼类的影响尚不确定。为了评估低溶解氧（DO）和高温条件对三种常见运动鱼类（大嘴鲈Micropterus salmoides，saugeye [Walleye Sander vitreus  ×Sauger S. canadensis ]和White Crappie Pomoxis ringis）栖息地质量的潜在影响），我们使用空间显式的生物能学模型来测量三个不同生产力和规模的俄亥俄州储层的潜在增长率（GRP）。在2015年或2016年8月，当每个温度和低氧水平预计达到或接近峰值时，在每个研究储层中收集了溶解氧，温度和猎物的生物量数据。在低氧的底水中，生长速度潜力通常较低，而在lim虫中生长速度较高，这是由于猎物集中在土霉素上。由于缺氧，高质量栖息地的数量（HQH；即GRP> 0 g / g / d）始终下降；但是，下降的程度取决于建模的物种和水库。在物种中，低氧导致的HQH损失很小，每个水库的差异不到8％。HQH的水库差异更大。³），而在储集层中，DO最高（5.1±0.07 mg / L），而空缺适当的猎物生物量最低（0.2±0.004至0.6±0.01 g / m ³），它们的变化范围为0.3–0.6％。即便如此，由于猎物生物量较高，平均DO最低（即最大的缺氧程度）的水库具有最高的GRP和HQH百分比。总的来说，我们的研究结果表明，底部缺氧可以降低温带水库中运动鱼的栖息地质量，但是高猎物生物量可能减轻缺氧的负面影响。