当前位置：
X-MOL 学术
›
J. Appl. Ecol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Increased sediment deposition triggered by climate change impacts freshwater pearl mussel habitats and metapopulations
Journal of Applied Ecology ( IF 5.0 ) Pub Date : 2021-06-10 , DOI: 10.1111/1365-2664.13940 Damiano Baldan 1, 2 , Jens Kiesel 3, 4 , Christoph Hauer 5 , Sonja C. Jähnig 3, 6 , Thomas Hein 1, 2
中文翻译：
气候变化引发的沉积物沉积增加影响淡水珍珠贻贝栖息地和复合种群
更新日期：2021-06-10
Journal of Applied Ecology ( IF 5.0 ) Pub Date : 2021-06-10 , DOI: 10.1111/1365-2664.13940 Damiano Baldan 1, 2 , Jens Kiesel 3, 4 , Christoph Hauer 5 , Sonja C. Jähnig 3, 6 , Thomas Hein 1, 2
Affiliation
|
- The freshwater pearl mussel Margaritifera margaritifera is a benthic organism sensitive to hydrological regime alterations and habitat degradation driven by excessive fine bed material deposit (FBMD). Both issues are potentially exacerbated by climate change. Understanding how climate change affects future mussel habitats and the dispersal among them (dependent on the brown trout as fish host) can support the planning of effective conservation actions.
- To project the impacts of climate change on the mussel, a semi-mechanistic modelling cascade was implemented for the Aist catchment in Austria (630 km2), including a hydrological model, a hydraulic model, Random Forest Models for FBMD accumulation risk and Species Distribution Models. Two climate change models (RCPs 4.5 and 8.5) for two future horizons (2060 and 2090) were considered. A graph-based assessment of the structural connectivity was used to measure the probability of successful dispersal.
- Results show a reduction of peak discharge that cascades into a widespread reduction in shear stresses during high flow. The mussel's habitats, defined by hydraulics (i.e. patches with low shear stresses during high flow), are predicted to be stable over the simulated scenarios.
- The pressure of FBMDs over the delineated habitat patches is predicted to increase in the future due to the reduced stream transport capacity, reducing up to 25% of the available patches in 2090 for RCP 8.5. Consequently, the mussel's dispersal probability decreases to 44.3%–75.6% of the maximum theoretical value, with the highest drops for short dispersal distances, impacting metapopulation dynamics.
- Synthesis and applications. The widespread issue of fine sediment deposition in the streambed will be exacerbated for those catchments where climate change reduces the stream transport capacity. The impacts on the freshwater pearl mussel include habitat loss due to the formation of a new unsuitable substrate, and a decrease in the potential dispersal among the residual habitats. Thus, conservation plans that aim to protect the mussel in the future should focus on the mitigation of fine bed material deposits, prioritizing those subreaches that offer the highest potential for preserving connectivity among suitable habitats.
中文翻译：
气候变化引发的沉积物沉积增加影响淡水珍珠贻贝栖息地和复合种群
- 淡水珍珠贻贝Margaritifera margaritifera是一种底栖生物，对过度细床物质沉积 (FBMD) 导致的水文状况改变和栖息地退化很敏感。气候变化可能会加剧这两个问题。了解气候变化如何影响未来的贻贝栖息地以及它们之间的扩散（依赖于作为鱼类宿主的褐鳟鱼）可以支持有效保护行动的规划。
- 为了预测气候变化对贻贝的影响，对奥地利的 Aist 流域（630 公里2）实施了半机械建模级联，包括水文模型、水力模型、FBMD 积累风险和物种分布的随机森林模型楷模。考虑了两个未来范围（2060 年和 2090 年）的两个气候变化模型（RCP 4.5 和 8.5）。结构连通性的基于图形的评估用于衡量成功扩散的概率。
- 结果显示峰值流量的减少会在高流量期间导致剪切应力的广泛减少。由水力学定义的贻贝栖息地（即高流量期间具有低剪切应力的斑块）预计在模拟情景中是稳定的。
- 由于河流运输能力降低，预计未来 FBMD 对划定栖息地斑块的压力会增加，2090 年 RCP 8.5 的可用斑块减少多达 25%。因此，贻贝的扩散概率下降到最大理论值的 44.3%–75.6%，其中短距离扩散的概率最大，影响了种群动态。
- 合成与应用。对于气候变化降低河流输送能力的流域，河床中细粒沉积物沉积的普遍问题将更加严重。对淡水珍珠贻贝的影响包括由于形成新的不合适的基质而造成的栖息地丧失，以及残留栖息地之间潜在扩散的减少。因此，旨在保护未来贻贝的保护计划应侧重于减少细床物质沉积，优先考虑那些为保护合适栖息地之间的连通性提供最大潜力的子区域。
京公网安备 11010802027423号