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Relative condition of fish habitat in streams of the Eastern Gulf of Mexico States. Histogram shows percentage of total stream length in each condition class.
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Abstract Dams have been a fundamental part of the U.S. national agenda over the past two hundred years. Recently, however, dam removal has emerged as a strategy for addressing aging, obsolete infrastructure and more than 1,100 dams have been removed since the 1970s. However, only 130 of these removals had any ecological or geomorphic assessments, and fewer than half of those included before- and after-removal (BAR) studies. In addition, this growing, but limited collection of dam-removal studies is limited to distinct landscape settings. We conducted a meta-analysis to compare the landscape context of existing and removed dams and assessed the biophysical responses to dam removal for 63 BAR studies. The highest...
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Uses direct output files of Aquatic Gap Analysis Program (AGAP) fish distribution models and National Fish Habitat Partnership (NFHP) 2010 Habitat Condition Indicies (HCI) to make summarized conclusions of stream condition and fish biological potential for Level 3 Ecoregions across the Conterminous United States (CONUS). Initial AGAP and NFHP products were represented at the local catchment scale of the National Hydrography Dataset Plus Version 1 (NHDPlusV1). To summarize AGAP and NFHP data into Level 3 EcoRegions a length-weighted average was used (i.e. the cumulative HCI value for each river reach within an ecoregion was weighted by the reach length with the formula (H1*L1+H2*L2...+HX*LX)/(H1+H2...+HX) where...
Summaries of fish habitat condition for ecological and jurisdictional spatial units that are commonly used for management decisions. Data from the National Fish Habitat Partnership's (NFHP) 2015 National Assessment were summarized from National Hydrography Dataset PlusV1 (NHDPlusV1; 1:100,000 scale) stream reaches to larger ecological and jurisdicitonal spatial units. A length-weighted average approach was used to summarize information. Summarization processes are documented in this repository. Steps include 1) Import data from source into database 2) Summarize Data 3) Visualize Data. Additional information about NFHP's 2015 National Assessment can be found at http://assessment.fishhabitat.org.
Human impacts occurring throughout the Northeast and Midwest United States, including urbanization, agriculture, and dams, have multiple effects on the region’s streams which support economically valuable stream fishes. Changes in climate are expected to lead to additional impacts in stream habitats and fish assemblages in multiple ways, including changing stream water temperatures. To manage streams for current impacts and future changes, managers need region-wide information for decision-making and developing proactive management strategies. Our project met that need by integrating results of a current condition assessment of stream habitats based on fish response to human land use, water quality impairment,...
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The stream systems of Hawai‘i are unique and home to many rare species, including five native fish and five native shellfish. These native species have amphidromous life cycles, meaning that they spend part of their lives in the ocean and part in freshwater streams. Stream flow serves as a vital natural pathway, connecting saltwater and freshwater habitats so that these animals can migrate between them and carry out critical life stages (e.g., development, reproduction). Over the last 20 years, the amount of rainfall in Hawai‘i has decreased, and climate models predict that this trend will continue. It is uncertain how reduced rainfall will affect stream flow and, consequently, the native stream species that depend...
This interactive figure summarizes the risk of fish habitat degradation. The currently selected tab shows data from the assessment of streams for Alaska. (a) Relative condition of fish habitat in streams. Stream summaries represent percentage of HUC12 area in each condition class. (b) Map showing risk of fish habitat degradation. The default view shows all stream condition classes. User may change map display by selecting a bar in (a), resulting in a display of the selected condition class in (b). Please see How to Read this Report for important information about strengths and limitations of these findings. Click here to download scores from the Alaska assessment of streams.
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The overall goal of the Midwestern regional-scale assessment was to identify river reaches in the Glacial Lakes Partnership regions (focusing on Michigan, Minnesota, and Wisconsin) that are most vulnerable to potential impacts of projected climate and land use changes. Because fish assemblages are strongly influenced by river water temperature and flow regimes, which are in turn affected by climate and land-use conditions, we will attempt to model fish habitat response to climate and land use changes through changes in temperature and flow. This project intended to: (1) develop three models that predict daily summer temperature for all river reaches in each state; (2) develop a single model to predict non-winter...
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One goal of the National Scale Assessment included identifying regions and associated river reaches across the United States that are most vulnerable to projected climate and land use changes. As an initial attempt to characterize river system vulnerability, we followed the definition posed by Kasperson et al. (2006) that incorporates exposure of systems to stresses like climate and land use changes, sensitivity of systems to those changes, and system resilience. This project intended to provide (1) a framework of stream classification to assess vulnerability of fish habitat under future climate change, (2) a framework of stream classification to assess vulnerability of fish habitat with projected urban and agriculture...
​Summary This analysis package summarize and visualize the National Fish Habitat Partnership's (NFHP) National Inland Assessment of Fish Habitats (2015) to ecological and jurisdictional boundaries that may be relevant to conservation decisions (e.g. National Park Boundaries, Hydrological Units, States). Often biologists, park managers and other decision makers are confronted with the need to prioritize funding for conservation and restoration efforts with limited resources and information to make decisions. These summaries of NFHP data are intended to give decisionmakers an additional set of information helping to better understand implications of fish habitat condition within their jurisdiction and the adjacent...
    map background search result map search result map Projected Climate Change for the Conterminous United States (National Assessment) Projected Climate and Land Use Change Impacts on Aquatic Habitats in the Midwestern United States (Regional Assessment) Summarization of Stream Condition and Fish Biological Potential by Ecoregion Assessing the Impact of Future Climate on Hawai‘i’s Aquatic Ecosystems Eastern Gulf of Mexico States Risk of Current Degradation Chart (Stream Length) Assessing the Impact of Future Climate on Hawai‘i’s Aquatic Ecosystems Eastern Gulf of Mexico States Risk of Current Degradation Chart (Stream Length) Projected Climate and Land Use Change Impacts on Aquatic Habitats in the Midwestern United States (Regional Assessment) Summarization of Stream Condition and Fish Biological Potential by Ecoregion Projected Climate Change for the Conterminous United States (National Assessment)