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Natural cave passages penetrating a coastal aquifer in the Yucatan Peninsula (Mexico) were accessed to test the hypothesis that chemoclines associated with salinity gradients (haloclines) within the flooded cave networks of the karst subterranean estuary are sites of methane oxidation. Two field trips were carried out to the fully-submerged cave system located 6.6 km inland from the coastline in January 2015 and January 2016. Vertical chemical profiles across the water column haloclines were obtained using the OctoPiPi (OPP), a high-resolution water sampler built by the U.S. Geological Survey (USGS). The sampling efforts resulted in cm-scale profiles of major ions (e.g., chloride and sulfate), as well as concentrations...
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This map shows the core analysis which focuses on impacts from climate change and human uses on aquatic habitats. Layers include: Current and long-term future percent cover of watershed permafrost along stream network; Large streams and large connected lakes compared to areas of medium and high thermokarst potential projected to thaw to at least 1-m depth by the 2060s in the CYR study area; ADEC impaired streams in the CYR study area; Open contaminated sites within 0.5 km of Aquatic Coarse-filter CEs in the CYR study area; Distribution of large streams and large connected lakes compared to density of placer mines in the CYR study area; Culverts inventoried by ADF&G for fish passage in the CYR study area and analysis...
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This map shows the distribution of Coarse-filter CEs in Minto Flats Lake District, CYR study area. Lakes shown on the map are connected to the NHD stream network. These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data....
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A significant challenge faced by climate scientists and land managers in the public and private sectors is the need for reliable and complete information about the status of ecosystem components (e.g. air, land, water, plants, animals) that may be influenced by climate change. While many organizations monitor one or more aspect of aquatic and terrestrial ecosystems, these monitoring programs are seldom coordinated and the associated data are not readily discoverable. The Global Change Monitoring Portal (GCMP) is a recently released tool of the DOI Southeast Climate Science Center designed to support the efforts of multiple federal, state, and other organizations by connecting them to these data resources. The GCMP...
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Natural cave passages penetrating a coastal aquifer in the Yucatan Peninsula (Mexico) were accessed to investigate how regional meteorology and hydrology control methane dynamics in karst subterranean estuaries. Three field trips were carried out in January 2015, June 2015, and January 2016 to obtain year-long high-resolution temporal records of water chemistry and environmental parameters below and above the surface at a site (Cenote Bang) within the Ox Bel Ha cave network. These efforts resulted in chemical records of dissolved methane concentrations and its stable carbon isotopic content and major ion concentrations (i.e., chloride and sulfate) in approximately 2.5-day resolution from January 2015 to January...
Streams and their surrounding catchments exchange water and solutes on a range of physical scales. Exchange with the stream may extend into the interstitial areas of the streambed, the hyporheic zone, the riparian area, or the catchment's groundwater flow system. Even at the smaller scales, the exchanges significantly influence solute transport, nutrient cycling, and the aquatic ecosystem. Over the recent decades, considerable attention has been given to the solute transport aspects of stream–groundwater interactions. Stream–groundwater interactions are now being recognized as practical matters to be considered in environmental issues, such as stream restoration and fish habitat. In this chapter, the emphasis is...
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Dispersal, establishment, and spread of aquatic invasive species such as the zebra mussel (Dreissena polymorpha) can be influenced by riverine velocities and volumetric flows in invaded lake-stream ecosystems. Zebra mussels, which have a planktonic larval form (veliger), disperse rapidly downstream from a source population. Concentrations, dispersal, and body conditions of zebra mussel veligers were studied under different volumetric flow, or discharge, conditions in a coupled lake-stream ecosystem in northern Texas, USA. Veliger densities in lotic environments were strongly related to population dynamics in upstream lentic source populations. A strong exponential decrease in veliger density was observed through...


    map background search result map search result map Development of a Global Change Monitoring Portal: Pilot Project for the Southeastern U.S. Biological and physical data for zebra mussel (Dreissena polymorpha) veligers collected from a coupled lake-stream ecosystem in north Texas, 2012-2014 Temporal hydrologic and chemical records from the Ox Bel Ha cave network within the coastal aquifer of the Yucatan Peninsula, from January 2015 to January 2016 BLM REA CYR 2013 Aquatic Ecosystems Coarse Filter Core Analysis Results BLM REA CYR 2013 Aquatic Ecosystems Coarse Filter Minto Flats Vertical chemical profiles collected across haloclines in the water column of the Ox Bel Ha cave network within the coastal aquifer of the Yucatan Peninsula in January 2015 and January 2016 Vertical chemical profiles collected across haloclines in the water column of the Ox Bel Ha cave network within the coastal aquifer of the Yucatan Peninsula in January 2015 and January 2016 Temporal hydrologic and chemical records from the Ox Bel Ha cave network within the coastal aquifer of the Yucatan Peninsula, from January 2015 to January 2016 Biological and physical data for zebra mussel (Dreissena polymorpha) veligers collected from a coupled lake-stream ecosystem in north Texas, 2012-2014 BLM REA CYR 2013 Aquatic Ecosystems Coarse Filter Minto Flats BLM REA CYR 2013 Aquatic Ecosystems Coarse Filter Core Analysis Results Development of a Global Change Monitoring Portal: Pilot Project for the Southeastern U.S.