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首页> 外文期刊>ICES Journal of Marine Science >A new method to estimate habitat potential for Atlantic salmon (Salmo salar): predicting the influence of dam removal on the Selune River (France) as a case study
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A new method to estimate habitat potential for Atlantic salmon (Salmo salar): predicting the influence of dam removal on the Selune River (France) as a case study

机译：一种估算大西洋鲑（Salmo salar）栖息地潜力的新方法：以案例研究的形式预测拆除大坝对塞卢讷河（法国）的影响

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Maintaining connectivity in aquatic ecosystems is important to ensure adequate ecological functioning. A large dam removal project in the Selune River (Normandy, France) would reconnect 827 km(2) of catchment area to the sea. Only the downstream section of the Selune is currently available to diadromous fish, which migrate between freshwater and the marine environment. In particular, managers focus on the future potential abundance of Atlantic salmon, Salmo salar, for conservation and fishery purposes. As in stream channel habitat drives carrying capacity of juvenile salmon, salmon abundance is usually inferred from intensive and linear habitat surveys. However, this approach is neither cost-effective for large-scale surveys nor feasible for riverbed sections with low accessibility for measurement with traditional methods, e.g. dam lakes. We used well-defined relationships between gradient, hydrology and channel habitat structure to construct a simple model to estimate potential suitable habitat for juvenile salmon. Using fine-scale habitat data from nearby rivers, we parameterized a linear mixed model to estimate the area of suitable habitat based on simple physical descriptors of river characteristics. We compared our predictions to fine-scale habitat surveys on the upper Selune. Using only slope and width, our model was able to explain 80% of the variance in suitable habitat. Estimates indicated that dam removal on the Selune River would generate a threefold increase in suitable habitat for juveniles. This could increase the mean number of adult salmon returning to the river by 1420.9 (s.e. = 1015.5). More generally, this model provides an alternative and cost-effective tool to help better manage salmon populations in rivers impacted by dams.
机译：维持水生生态系统的连通性对于确保适当的生态功能非常重要。 Selune河（法国诺曼底）的大型水坝拆除项目将把827 km（2）的集水区重新连接到大海。目前，只有塞勒河的下游部分可用于过淡鱼类，它们在淡水和海洋环境之间迁移。特别是，管理人员将重点放在保护和渔业目的大西洋鲑（Salmo salar）的未来潜在丰度上。由于在河道中栖息地驱动着幼鲑的承载能力，鲑鱼的丰度通常是从密集和线性的栖息地调查中推断出来的。但是，这种方法对于大规模勘测既不具有成本效益，也不适用于使用传统方法（例如：大坝湖。我们使用梯度，水文和河道生境结构之间的明确定义的关系来构建一个简单的模型，以估算可能适合幼鲑的生境。我们使用附近河流的精细栖息地数据，对线性混合模型进行了参数化处理，以基于河流特征的简单物理描述来估算合适的栖息地面积。我们将我们的预测与塞鲁纳河上游的精细栖息地调查进行了比较。仅使用坡度和宽度，我们的模型就能解释适当栖息地中80％的方差。估计表明，塞勒尼河上的大坝拆除将使适合少年的栖息地增加三倍。这样可以使返回河中的成年鲑鱼的平均数量增加1420.9（即= 1015.5）。更一般而言，该模型提供了一种替代且具有成本效益的工具，以帮助更好地管理受大坝影响的河流中的鲑鱼种群。

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