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Freshwater Resilience, Highest and High, Watersheds for Complex and Non-complex Stream Networks, Northeast U.S

Dates

Creation
2017-06-07 15:11:42
Last Update
2018-02-15 19:38:22

Citation

North Atlantic Landscape Conservation Cooperative(administrator), Mark G. Anderson(Principal Investigator), 2017-06-07(creation), 2018-02-15(lastUpdate), Freshwater Resilience, Highest and High, Watersheds for Complex and Non-complex Stream Networks, Northeast U.S

Summary

Freshwater Resilience, Highest and High, Watersheds for Complex and Non-complex Stream Networks, Northeast U.S. is one of a suite of products from the Nature’s Network project (naturesnetwork.org).As growing human populations increase the pace of climate and land use changes, estimating the resilience of freshwater systems will be increasingly important for delivering effective long-term conservation. A region-wide analysis of freshwater stream networks was developed by Mark Anderson and associates at The Nature Conservancy (Anderson et al., 2013) to estimate the capacity of each network to cope with climatic and environmental change. The analysis centered on the evaluation resiliency: characteristics that may allow stream ecosystems [...]

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Purpose

Freshwater Resilience, Highest and High, Watersheds for Complex and Non-complex Stream Networks, Northeast U.S. is one of a suite of products from the Nature’s Network project (naturesnetwork.org). This dataset was derived from an analysis of freshwater resilience of stream networks in the Northeast and Mid-Atlantic region, pioneered by Mark Anderson and associates at The Nature Conservancy (Anderson et al., 2013). Resilient stream systems or watersheds are those that will support a full spectrum of biodiversity and maintain their functional integrity even as species compositions and hydrologic properties change in response to shifts in ambient conditions due to climate change. A stream network was defined as a continuous system of functionally connected streams, rivers, and lakes bounded by dams or upper headwaters. To facilitate combination with other Nature’s Network products, stream networks were delineated into watersheds (roughly HUC 10/12), rather than stream networks, in this version. The high and highest relative resiliency watersheds identified in this product are those that, compared to other watersheds with similar native fish composition, rate higher than average on seven characteristics correlated with resilience. These included four physical properties (stream network length, number of size classes, number of gradients classes and number of temperature classes), and three condition characteristics (risk of hydrologic alterations, natural cover in the floodplain, and amount of impervious surface in the watershed). Because biota and physical processes are linked to the size of bodies of water, watersheds of stream networks which contain a variety of stream and lake sizes are expected to be more resilient by providing varied habitats and refugia, allowing native species to persist. Watersheds with at least five size classes are highlighted as “complex” in this product. There was high correspondence between complex and high/highest relative resiliency-rated stream networks, and The Nature Conservancy’s portfolio of freshwater priority rivers (available as a separate dataset). A separate dataset which includes all stream networks across the full range of resiliency scores is also available, but note that stream networks do not correspond to HUC 12 watersheds used in other Nature’s Network aquatic products. https://nalcc.databasin.org/datasets/6fe82a3f1caa45aaafd65907abc4c38d
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  • LC MAP - Landscape Conservation Management and Analysis Portal
  • North Atlantic Landscape Conservation Cooperative

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