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An integrative conservation planning framework for aquatic landscapes fragmented by road-stream crossings
Landscape and Urban Planning ( IF 9.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.landurbplan.2020.103860
Joshuah S. Perkin , Matthew R. Acre , Jessica Graham , Kathleen Hoenke

Abstract Road-stream crossings represent a significant source of habitat fragmentation for global aquatic ecosystems, yet integrative conservation planning frameworks are lacking for most regions. We describe a connectivity conservation planning framework that draws on recent advances in the fields of surveying, modelling, and optimizing removal of crossings that block aquatic organism passage. We demonstrate this framework with a case study involving 1200 crossings surveyed in Florida, USA in which barrier severity was quantified on a continuous scale from 0 (complete barrier) to 1 (no barrier). Using field surveys, we built a boosted regression tree (BRT) model that linked barrier severity to 44 landscape variables representing natural (e.g., stream size) and anthropogenic (e.g., land use) stream conditions. We used a recently developed optimization routine to conduct two scenarios, including (1) surveyed crossings only and (2) surveyed crossings plus crossings modelled at 5545 unsurveyed locations. The BRT model explained 54% of variation in barrier severity scores and showed that the most severe barriers occurred on small, high-elevation streams draining urban and agricultural catchments. Estimates of connectivity gains following remediation were 5.3-times lower when unsurveyed locations were included in the optimization, suggesting inclusion of unsurveyed sites is critical for conservation planning. Results from this framework can be used over short (e.g., planning immediate barrier mitigation) and long (e.g., planning future field surveys) time horizons to benefit aquatic connectivity conservation. The survey protocol and modelling methods used here, combined with global datasets on stream conditions, can be applied to benefit connectivity planning in other regions.

中文翻译:

由公路-河流交叉口支离破碎的水生景观综合保护规划框架

摘要 道路河流交叉点是全球水生生态系统栖息地破碎化的重要来源,但大多数地区缺乏综合保护规划框架。我们描述了一个连通性保护规划框架,该框架利用了在测量、建模和优化清除阻塞水生生物通道的交叉点方面的最新进展。我们通过一个案例研究展示了这个框架,该案例研究涉及在美国佛罗里达州调查的 1200 个交叉路口,其中障碍严重程度在从 0(完全障碍)到 1(无障碍)的连续范围内量化。通过实地调查,我们建立了一个增强回归树 (BRT) 模型,该模型将障碍严重程度与代表自然(例如,河流大小)和人为(例如,土地利用)河流条件的 44 个景观变量联系起来。我们使用最近开发的优化程序来执行两个场景,包括 (1) 仅调查过的路口和 (2) 调查过的路口加上在 5545 个未调查位置建模的路口。BRT 模型解释了障碍严重性评分中 54% 的变化,并表明最严重的障碍发生在排放城市和农业集水区的小而高海拔的河流上。当优化中包含未经调查的地点时,修复后连通性增益的估计值要低 5.3 倍,这表明包含未经调查的地点对于保护规划至关重要。该框架的结果可用于短期(例如,规划立即障碍缓解)和长期(例如,规划未来实地调查)的时间范围,以有利于水生连通性保护。
更新日期:2020-10-01
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