中心系统集成和可持续性

杂志或书名:生态指标

关键词:阈值分析;鱼功能特征;景观的影响;游戏鱼;采矿;河流

体积/问题:50

页码(s):50 - 61

发表:2014年

采矿影响流系统历史研究在小空间尺度上,然而在大面积调查可能是用于描述矿业作为地区的压力来源流鱼。共病的流鱼组合之间的关联和密度的不同“类”的矿业发生在相同的集雨使用阈值进行了测试分析。阈值分析确定点鱼组合大幅改变从最好的生境条件增加扰动。因为这发生在大的区域,包括鱼类组合是由各种功能特征以及其他感兴趣的管理措施(生殖生态学特征和生活史,栖息地偏好,营养生态学、组合多样性和均匀度,宽容人为干扰和州立承认游戏物种)。我们使用两个阈值检测方法:变点分析与指标分析和分段线性回归。We accepted only those thresholds that were highly statistically significant (p
0.01) for both techniques and overlapped within
5% error. We found consistent, wedge-shaped declines in multiple fish metrics with increasing levels of mining in catchments, suggesting mines are a regional source of disturbance. Threshold responses were consistent across the three ecoregions occurring at low mine densities. For 47.2% of the significant thresholds, a density of only
0.01 mines/km2 caused a threshold response. In fact, at least 25% of streams in each of our three study ecoregions have mine densities in their catchments with the potential to affect fish assemblages. Compared to other anthropogenic impacts assessed over large areas (agriculture, impervious surface or urban land use), mining had a more pronounced and consistent impact on fish assemblages.

DOI:10.1016 / j.ecolind.2014.10.018

类型的出版物:期刊文章