Digital Data
type: Distribution
access URL: https://doi.org/10.5066/P9R39F33
media type: application/http
description: Landing page for access to the data
format: XML
issued: 2022-07-28T19:44:39.426681
modified: 2025-11-22T20:34:27.839916

US Migrating
type: Agent

Selenium concentrations in Yuma Ridgway's Rails occupying managed and unmanaged emergent marshes at the Salton Sea
type: Dataset
contact point: Organization
  fn: Mark Ricca
keyword: colorado-river
keyword: ckan
keyword: biota
keyword: toxic-trace-element-contamination
keyword: amerigeo
keyword: california
keyword: field-inventory-and-monitoring
keyword: national
keyword: salton-sea
keyword: usgs-61b274f9d34e3bd218621245
keyword: yuma-ridgways-rail
keyword: ecotoxicology
keyword: amerigeoss
keyword: geoss
keyword: north-america
keyword: water-management
keyword: geo
keyword: environment
keyword: planningcadastre
keyword: selenium
keyword: invertebrate
keyword: united-states
theme: {geospatial}
description: Yuma Ridgway’s rail (Rallus obsoletus yumanensis, hereafter, rail) are an endangered species for which patches of emergent marsh within the Salton Sea watershed comprise a substantial portion of habitat for the species’ disjointed range in the southwestern United States. These areas of emergent marsh include: 1) marshes managed by federal (particularly the U.S. Fish and Wildlife Service’s Sonny Bono Salton Sea National Wildlife Refuge (SBSSNWR), state (California Department of Fish and Wildlife), and local (Imperial Irrigation District) resource agencies that are sustained by direct deliveries of Colorado River water; and 2) unmanaged marshes sustained by agricultural drainage water. Management of rail habitat in this arid environment is complicated by increasingly limited availability of unimpaired freshwater owing by recent water management decisions associated with the Quantification Settlement Agreement, and risks posed by potentially harmful concentrations of selenium (Se) found in agricultural drainage water that can readily bioaccumulate in aquatic food webs. To provide timely science for managers, the selenium concentrations in this data release are the basis for summary statistics reported in Ricca et al. 2022. These data comprise selenium concentrations and associated locations and dates of the following matrices sampled to describe pathways of selenium exposure to rails occupying managed and unmanaged marshes: 1) unfiltered surface water, midge larvae (Chironomidae), water boatmen (Corixidae), mosquitofish (Gambusia spp.) and crayfish (Astacidae). Selenium samples were collected from 15 fixed sampling points each in managed and unmanaged marshes during late February, April, and June of 2016, which corresponded to rail pre-nesting, nesting, and fledgling reproductive life-stages, respectively. Two areas within the two treatment types (managed vs. unmanaged marsh) were of particular interest to help assess risks associated with changing Sea dynamics and dif…
issued: 2025-11-22T20:34:27.851780
modified: 20220420
spatial: Location

Original Metadata
type: Distribution
access URL: https://data.usgs.gov/datacatalog/metadata/USGS.61b274f9d34e3bd218621245.xml
media type: text/xml
description: The metadata original format
format: XML
issued: 2022-07-28T19:44:39.426675
modified: 2025-11-22T20:34:27.839474