Local and landscape drivers of aquatic-to-terrestrial subsidies in riparian ecosystems: a worldwide meta-analysis
Local and landscape drivers of aquatic-to-terrestrial subsidies in riparian ecosystems: a worldwide meta-analysis
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DOI：
10.1002/ecs2.2697
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发表时间：
2019-04-01
期刊：
影响因子：
2.7
通讯作者：
Piccolo, J. J.
中科院分区：
文献类型：
--
作者：
Lafage, D.;Bergman, E.;Piccolo, J. J.
生物体和物质的跨界通量，即所谓的“补贴”，现在被认为是相互的，并且对于水生和陆地系统来说大致同等重要，即使陆地对水生生态系统的投入受到了最多的关注。水生对陆地补贴的规模有据可查，但这些补贴背后的驱动因素及其陆地消费者的利用通常是局部规模的研究，限制了可以在更广泛的地理范围内得出的推论。因此，我们建立并分析了从全球 21 项研究中提取的稳定同位素数据数据库，以确定可能影响河岸生态系统中陆地捕食者饮食的景观尺度（流域）和局部尺度（100 米河岸带）变量。我们的荟萃分析显示，水生到陆地的补贴幅度比之前报告的要大（>50%），尽管存在很大的地理和年际差异。此外，我们证明了景观尺度因素对水生陆地补贴的巨大影响，特别是人为土地利用和树木覆盖。当地人口是当地规模的唯一相关因素。我们还发现，生态文献中关于景观规模和人为土地利用对水生陆地补贴影响的研究严重不足，这限制了目前可以得出的关于景观影响的一般推论。我们建议景观尺度研究可以提高我们对土地利用和环境变化如何影响未来生物多样性和生态系统功能模式的理解。
Cross-boundary fluxes of organisms and matter, termed "subsidies," are now recognized to be reciprocal and of roughly equal importance for both aquatic and terrestrial systems, even if terrestrial input to aquatic ecosystems has received most attention. The magnitude of aquatic-to-terrestrial subsidies is well documented, but the drivers behind these subsidies and their utilization by terrestrial consumers are characteristically local-scale studies, limiting the inferences that can be drawn for broader geographic scales. We therefore built and analyzed a database of stable isotope data extracted from 21 studies worldwide, to identify both landscape-scale (catchment) and local-scale (100-m riparian zone) variables that may affect the diet of terrestrial predators in riparian ecosystems. Our meta-analysis revealed a greater magnitude of aquatic-to-terrestrial subsidies (>50%) than previously reported, albeit with large geographic and inter-annual variations. Moreover, we demonstrated a large effect of landscape-scale factors on aquaticto-terrestrial subsidies, particularly anthropogenic land use and tree cover. Local human population was the only relevant factor at the local scale. We also found that studies on landscape-scale and anthropogenic land use effects on aquatic-to-terrestrial subsidies are strongly under-represented in the ecological literature, which limits the general inferences that can currently be drawn about landscape effects. We suggest that landscape-scale studies could improve our understanding of how land use and environmental change might influence future patterns of biodiversity and ecosystem function.