期刊
ECOLOGY AND SOCIETY
卷 19, 期 3, 页码 -出版社
RESILIENCE ALLIANCE
DOI: 10.5751/ES-06750-190315
关键词
biodiversity; cross-scale resilience; functional feeding groups; invertebrates; local and regional determinants; river ecosystems; spatial modeling
资金
- August T. Larsson foundation of the Faculty of Natural Resources (Swedish University of Agricultural Sciences)
- USGS Powell Center for Analysis and Synthesis
- FRESHCLIM from Marie Curie Actions of the European Commission
- U.S. Geological Survey
- Nebraska Game and Parks Commission
- University of Nebraska-Lincoln
- U.S. Fish and Wildlife Service
- Wildlife Management Institute
The distribution of functional traits within and across spatiotemporal scales has been used to quantify and infer the relative resilience across ecosystems. We use explicit spatial modeling to evaluate within-and cross-scale redundancy in headwater streams, an ecosystem type with a hierarchical and dendritic network structure. We assessed the cross-scale distribution of functional feeding groups of benthic invertebrates in Swedish headwater streams during two seasons. We evaluated functional metrics, i.e., Shannon diversity, richness, and evenness, and the degree of redundancy within and across modeled spatial scales for individual feeding groups. We also estimated the correlates of environmental versus spatial factors of both functional composition and the taxonomic composition of functional groups for each spatial scale identified. Measures of functional diversity and within-scale redundancy of functions were similar during both seasons, but both within-and cross-scale redundancy were low. This apparent low redundancy was partly attributable to a few dominant taxa explaining the spatial models. However, rare taxa with stochastic spatial distributions might provide additional information and should therefore be considered explicitly for complementing future resilience assessments. Otherwise, resilience may be underestimated. Finally, both environmental and spatial factors correlated with the scale-specific functional and taxonomic composition. This finding suggests that resilience in stream networks emerges as a function of not only local conditions but also regional factors such as habitat connectivity and invertebrate dispersal.
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