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首页> 外文期刊>River Research and Applications >EFFECTS OF GRAVEL AUGMENTATION ON MACROINVERTEBRATE ASSEMBLAGES IN A REGULATED CALIFORNIA RIVER
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EFFECTS OF GRAVEL AUGMENTATION ON MACROINVERTEBRATE ASSEMBLAGES IN A REGULATED CALIFORNIA RIVER

机译：强化碎石对调节型加利福尼亚河大型无脊椎动物组合的影响

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Enhancement projects within anadromous salmonid rivers of California have increased in recent years. Much of this work is intended as mitigation in regulated streams where salmon and steelhead spawning habitat is inaccessible or degraded due to dams, water diversions and channelization. Little research has been done to assess the benefits of spawning habitat enhancement to stream organisms other than salmon. We monitored benthic macroinvertebrates at seven spawning gravel augmentation sites in the lower Mokelumne River, a regulated stream in the Central Valley of California. Placement of cleaned floodplain gravel decreased depths and increased stream velocities. Benthic organisms colonized new gravels quickly, equalling densities and biomass of unenhanced spawning sites within 4 weeks. Macroinvertebrate species richness equalled that of unenhanced sites within 4 weeks and diversity within 2 weeks. Standing crop, as indicated by densities and dry biomass, was significantly higher in enhancement sites after 12 weeks than in unenhanced sites and remained so over the following 10 weeks. Although mobile collector/browsers initially dominated new gravels, sedentary collectors were the most common feeding category after 4 weeks, similar to unenhanced sites. These data suggest that cleaned gravels from adjacent floodplain materials, used to enhance salmonid spawning sites, are quickly incorporated into the stream ecosystem, benefiting benthic macroinvertebrate densities and dry biomass.
机译：近年来，加利福尼亚州的鲑鱼河流中的增强项目有所增加。这项工作的大部分目的是缓解受管制的河流，在这些河流中，由于水坝，引水和渠道化，鲑鱼和硬头鱼的产卵栖息地无法到达或退化。评估产卵栖息地对鲑鱼以外的河流生物的益处的研究很少。我们在加利福尼亚中央谷地受管制的莫克伦河下游的七个产卵砾石增强点监测底栖大型无脊椎动物。放置经过清洗的洪泛区砾石可减少深度，并增加溪流速度。底栖生物迅速在新的砾石中定殖，在4周内达到了未增强产卵位点的密度和生物量。大型无脊椎动物物种丰富度在4周内等于未增强位点，而在2周内则等于多样性。如密度和干生物量所示，站立的作物在增强位点12周后明显高于未增强位点，并在随后的10周内保持不变。尽管移动式收集器/浏览器最初在新的砾石中占主导地位，但久坐的收集器在4周后是最常见的喂养类别，类似于未增强的场所。这些数据表明，用于增强鲑鱼产卵场的邻近洪泛区材料的清洁砾石已迅速纳入河流生态系统，从而有利于底栖大型无脊椎动物密度和干燥生物量。

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