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A comprehensive assessment of stream fragmentation in Great Britain

机译：英国流碎片综合评价

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Artificial barriers are one of the main threats to river ecosystems, resulting in habitat fragmentation and loss of connectivity. Yet, the abundance and distribution of most artificial barriers, excluding high-head dams, is poorly documented. We provide a comprehensive assessment of the distribution and typology of artificial barriers in Great Britain, and estimate for the first time the extent of river fragmentation. To this end, barrier data were compiled from existing databases and were ground-truthed by field surveys in England, Scotland and Wales to derive a correction factor for barrier density across Great Britain. Field surveys indicate that existing barrier databases underestimate barrier density by 68%, particularly in the case of low-head structures (1 m) which are often missing from current records. Field-corrected barrier density estimates ranged from OAS barriers/km in Scotland to 0.63 barriers/km in Wales, and 075 banters/km in England. Corresponding estimates of stream fragmentation by weirs and dams only, measured as mean barrier-free length, were 12.30 km in Scotland, 6.68 km in Wales and 529 km in England, suggesting the extent of river modification differs between regions. Our study indicates that 97% of the river network in Great Britain is fragmented and 1% of the catchments are free of artificial barriers. (C) 2019 Elsevier B.V. All rights reserved.
机译：人工障碍是对河流生态系统的主要威胁之一，导致栖息地分散和损失的连通性。然而，除高压水坝不包括大多数人造障碍的丰富和分布尚未记录。我们对英国人工障碍的分销和类型进行了全面评估，并估算了河流分裂程度的第一次。为此，障碍数据从现有数据库编制，并由英格兰，苏格兰和威尔士的田间调查进行地面判决，以导出跨英国障碍密度的校正因素。现场调查表明，现有的屏障数据库低估了阻挡密度68％，特别是在低头结构（<1米）的情况下，通常从当前记录中丢失。现场纠正的屏障密度估计范围从苏格兰的OAS障碍/ km到威尔士的0.63个障碍/ km，在英格兰075个刀架/ km。苏格兰仅测量堰和水坝的物流碎片估计，苏格兰为12.30公里，威尔士6.68公里，英格兰529公里，建议地区之间的河流修改程度不同。我们的研究表明，英国97％的河道网络分散，其中1％的流域不含人工障碍。 （c）2019 Elsevier B.v.保留所有权利。

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