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Salmon abundance and patterns of forest greenness as measured by satellite imagery.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-05 , DOI: 10.1016/j.scitotenv.2020.138448
Christopher J Brown 1 , Brett Parker 2 , Morgan D Hocking 3 , John D Reynolds 4
Affiliation  

Linkages across ecosystems can shape productivity. Salmon carcasses are exemplary of cross-system linkages, because they can fertilize riparian vegetation and shape patterns of terrestrial biodiversity. Detection of salmon fertilization effects has been confined to field-based studies that are limited in scale. Here we use satellite images to quantify the effects of salmon on greenness of riparian vegetation. We measure tree greenness across spatial and temporal gradients of salmon fertilization effects in two regions. In the first case study, we find that deciduous trees are greener in years following large salmon spawning events, and that the magnitude of this effect was related to the specific abundance of spawning salmon. In the second case study we compare greenness of mixed evergreen and deciduous forests across different watersheds that have different salmon spawning densities. We found greenness was related positively to salmon spawning density near streams with high evergreen cover and flat stream banks. These findings suggest that the effect of salmon carcasses on riparian vegetation may be detectable from space. Further work on this approach, especially with high spatial, temporal and spectral data, may allow estimation of the spatial extent of nutrient enrichment from salmon carcasses and aid ecosystem-based management to protect important ecosystem linkages.

中文翻译:

通过卫星图像测得的鲑鱼丰度和森林绿色度的模式。

生态系统之间的联系可以影响生产力。鲑鱼尸体是跨系统联系的典范,因为它们可以给河岸植被施肥并塑造陆地生物多样性的形态。鲑鱼受精效果的检测仅限于规模有限的实地研究。在这里,我们使用卫星图像来量化鲑鱼对河岸植被绿色的影响。我们测量了两个地区鲑鱼施肥效应的时空梯度上的树木绿度。在第一个案例研究中,我们发现在大型鲑鱼产卵事件发生后的几年中,落叶乔木更绿了,这种影响的程度与鲑鱼产卵的具体丰度有关。在第二个案例研究中,我们比较了鲑鱼产卵密度不同的不同流域的常绿和落叶混交林的绿度。我们发现,绿色与高常绿覆盖和平坦河岸附近河流的鲑鱼产卵密度呈正相关。这些发现表明,鲑鱼尸体对河岸植被的影响可以从太空中检测到。关于这种方法的进一步工作,尤其是在具有高空间,时间和光谱数据的情况下,可允许估算鲑鱼尸体养分富集的空间范围,并有助于基于生态系统的管理,以保护重要的生态系统联系。这些发现表明,鲑鱼尸体对河岸植被的影响可以从太空中检测到。关于这种方法的进一步工作,尤其是在具有高空间,时间和光谱数据的情况下,可允许估算鲑鱼尸体养分富集的空间范围,并有助于基于生态系统的管理,以保护重要的生态系统联系。这些发现表明,鲑鱼尸体对河岸植被的影响可以从太空中检测到。关于这种方法的进一步工作,尤其是在具有高空间,时间和光谱数据的情况下,可允许估算鲑鱼尸体养分富集的空间范围,并有助于基于生态系统的管理,以保护重要的生态系统联系。
更新日期:2020-04-06
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