Spatial distribution and geomorphic condition of fish habitat in streams: an analysis using hydraulic modelling and geostatistics
Spatial distribution and geomorphic condition of fish habitat in streams: an analysis using hydraulic modelling and geostatistics
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DOI：
10.1002/rra.1085
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发表时间：
2008-09
影响因子：
2.2
通讯作者：
Jess Clark;D. Rizzo;M. Watzin;W. Hession
中科院分区：
文献类型：
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作者：
Jess Clark;D. Rizzo;M. Watzin;W. Hession
范围尺度的物理栖息地评估分数越来越多地用于管理决策。我们使用详细的二维水力模型和空间分析技术（半变异函数分析）对四种鱼类在河段和子河段尺度上的水力栖息地特征的空间分布进行了表征。接下来，我们探讨了这些水力特征是否与常用的范围尺度地貌评估（RGA）评分，快速栖息地评估（RHA）评分或鱼类生物多样性和丰度指数相关。River2D被用来计算加权可用面积（WUAs）在中位数流量，Q50，为6个佛蒙特州流使用模拟的速度，深度估计，通道床数据和栖息地适合性曲线blackhinichthys atratulus），褐鳟鱼（萨尔莫trutta），普通的小亮鲷（Notropis cornutus）和白色吸盘（Catostomus besoni）在成人和产卵阶段。各河段水利用率的空间分布不同，从高水利用率斑块的均匀分布到孤立斑块的不规则分布。流与不连续的，不同的补丁的高分WUA有较低的鱼类生物完整性与佛蒙特州的混合水生物完整性指数（MWIBI）比流更均匀分布的高WUA。事实上，可用生境的分布可能是鱼类群落的一个决定因素。预测的用水量平均在达到规模和RGA或RHA scores之间的关系没有发现。未来的研究需要确定适当的空间尺度，以捕捉可用的补丁之间的连接流通道栖息地。版权所有© 2008约翰威利父子有限公司.
Reach‐scale physical habitat assessment scores are increasingly used to make decisions about management. We characterized the spatial distribution of hydraulic habitat characteristics at the reach and sub‐reach scales for four fish species using detailed two‐dimensional hydraulic models and spatial analysis techniques (semi‐variogram analyses). We next explored whether these hydraulic characteristics were correlated with commonly used reach‐scale geomorphic assessment (RGA) scores, rapid habitat assessment (RHA) scores, or indices of fish biodiversity and abundance. River2D was used to calculate weighted usable areas (WUAs) at median flows, Q50, for six Vermont streams using modelled velocity, depth estimates, channel bed data and habitat suitability curves for blacknose dace (Rhinichthys atratulus), brown trout (Salmo trutta), common shiner (Notropis cornutus) and white sucker (Catostomus commersoni) at both the adult and spawn stages. All stream reaches exhibited different spatial distributions of WUA ranging from uniform distribution of patches of high WUA to irregular distribution of more isolated patches. Streams with discontinuous, distinct patches of high score WUA had lower fish biotic integrity measured with the State of Vermont's Mixed Water Index of Biotic Integrity (MWIBI) than streams with a more uniform distribution of high WUA. In fact, the distribution of usable habitats may be a determining factor for fish communities. A relationship between predicted WUAs averaged at the reach scale and RGA or RHA scores was not found. Future research is needed to identify the appropriate spatial scales to capture the connections between usable patches of stream channel habitat. Copyright © 2008 John Wiley & Sons, Ltd.