Stream-dwelling Brook Trout Salvelinus fontinalis rely heavily on terrestrial invertebrates, especially when aquatic prey is limited. We examined the effects of an experimental harvest of riparian timber on the diet and condition of Brook Trout in late summer. We evaluated the effects of two riparian harvest intensities (50% and 90% of the basal area harvest) in each of two streams on the diet, consumption, abundance, and condition of Brook Trout in summer. The diets and consumption patterns of Brook Trout were affected by the percentage of riparian timber harvest. Timber harvest increased the use of aquatic invertebrates—primarily via increased consumption of crayfish. In the 90% treatments, the use of terrestrial invertebrates by Brook Trout declined primarily due to the decreased use of Lepidoptera. Overall, consumption levels in the 50% treatments were nearly double those in the reference or 90% treatments. A common forestry best management practice is to limit riparian harvest to 50% of the basal area. Provided water quality and quantity are not affected, our study suggests that a 50% timber harvest limitation in the riparian area may provide at least a temporary boost in consumption due to an increase in the use of aquatic insects.

中文翻译：

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河岸木材采伐强度影响阿巴拉契亚溪鳟鱼的饮食

溪流鳟鱼Salvelinus fontinalis严重依赖陆生无脊椎动物，特别是当水生猎物有限时。我们研究了河岸木材的实验收获对夏末布鲁克鳟鱼的饮食和状况的影响。我们评估了两条河流中每条河流的两种河岸捕捞强度（基础面积捕捞量的 50% 和 90%）对夏季布鲁克鳟鱼的饮食、消费、丰度和状况的影响。溪鳟的饮食和消费模式受河岸木材采伐百分比的影响。木材收获增加了水生无脊椎动物的使用——主要是通过增加小龙虾的消费。在 90% 的处理中，Brook Trout 对陆生无脊椎动物的使用下降，主要是由于鳞翅目的使用减少。全面的，50% 处理的消耗水平几乎是参考或 90% 处理的两倍。一个常见的林业最佳管理实践是将河岸采伐限制在基础面积的 50%。如果水质和水量不受影响，我们的研究表明，由于水生昆虫的使用增加，河岸地区木材采伐限制 50% 可能至少会暂时增加消费量。