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Mercury in biota and sediment in the Walker River Basin, Nevada and California
Zusammenfassung
- Art der Freigabe
- a one-off release of a single dataset
- Datenlizenz
- Not Applicable
- Inhaltslizenz
- Creative Commons CCZero
- Bestätigung
- automatisiert zertifiziert
- Veröffentlichungsdatum
- 24 April 2014
- Änderungsdatum
- 27 August 2015
- Herausgeber
- US Fish and Wildlife Service, Department of the Interior
- Schlagworte
- birds, common-loons, environmental-contaminants-investigation, fish, hg, mining, sweetwater-creek, tui-chub, virginia-creek-watershed
- Identifier
- mercury-in-biota-and-sediment-in-the-walker-river-basin-nevada-and-california
- Landing Page
- http://catalog.data.gov/dataset/mercury-in-biota-and-sediment-in-the-walker-river-basin-nevada-and-california
- Maintainers
- Richard Easterbrook richard_easterbrook@fws.gov
Community-Bestätigung
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Beschreibung
Common loons Gavia immer that stage during migration at Walker Lake, Nevada, were found to have elevated concentrations of mercury in their blood. The source of the mercury was unknown, although fish from Walker Lake were known to contain moderate concentrations. Therefore, an investigation was initiated to determine the sources of mercury in the Walker River basin and the concentrations of mercury in Walker Lake tui chub Gila bicolor of the size consumed by common loons to determine risk to this fisheating species. A total of 12 fish and 29 aquatic invertebrate samples were collected in 19992001 at 19 sites in the Walker River basin. Mercury concentrations in aquatic invertebrate samples collected at sites downstream of historic mine sites, where mercury was used in precious metal recovery in the late 1800s, were often higher than at sites where no historic mining influences were present. Mercury concentrations in tui chub from Walker Lake increased with size of the fish, with a major increase for fish greater than 25 cm in length. Mercury concentrations in fish were below those associated with adverse effects to fish. Mercury concentrations in larger tui chubs may be a risk to fisheating birds, including common loons. Data on mercury concentrations in stream sediment from the Walker River basin that were provided by the U.S. Geological Survey and the U.S. Environmental Protection Agency were examined in relation to the concentrations found in this study in aquatic invertebrates. These data sets suggested that mercury source areas included: an area of the Virginia Creek watershed, south of Bridgeport, California; several sites on the southeast side of the Sweetwater Range near the CaliforniaNevada state line, which included areas along Sweetwater and Fryingpan Creeks; Bodie, California; and the nearby Aurora district in Nevada. Additional studies are needed to further define mercury source areas for possible stabilization or cleanup. Additional information is also needed on common loons which include the following: fall migration patterns and wintering areas to determine if the birds frequent known areas of mercury contamination; mercury exposure on the breeding grounds in Saskatchewan; and mercury in blood of loons using other Nevada lakes and reservoirs during migration to determine if Walker Lake is a significant source of mercury.
Allgemeine Informationen
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Die Beschreibung der Daten befindet sich unter
http://catalog.data.gov/dataset/mercury-in-biota-and-sediment-in-the-walker-river-basin-nevada-and-california Do you think this data is incorrect? Let us know
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Die Daten werden veröffentlicht von…
US Fish and Wildlife Service, Department of the Interior Do you think this data is incorrect? Let us know
Rechtliche Information
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Die Nutzungsbestimmungen finden sich unter
http://catalog.data.gov/dataset/mercury-in-biota-and-sediment-in-the-walker-river-basin-nevada-and-california Do you think this data is incorrect? Let us know
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Under which licence can people outside the US reuse this data?
Creative Commons CCZero Do you think this data is incorrect? Let us know
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Es gibt
yes, and the rights are all held by the same person or organisation Do you think this data is incorrect? Let us know
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Die Inhalte können im Rahmen der folgenden Lizenz weiterverwendet werden
Creative Commons CCZero Do you think this data is incorrect? Let us know
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Technische Hinweise
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Die Daten werden veröffentlicht unter
http://ecos.fws.gov/ServCatFiles/reference/holding/21771?accessType=DOWNLOAD Do you think this data is incorrect? Let us know
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Das Format der Daten ist
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Einen Ansprechpartner zu diesen Daten finden Sie unter
http://catalog.data.gov/dataset/mercury-in-biota-and-sediment-in-the-walker-river-basin-nevada-and-california Do you think this data is incorrect? Let us know
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Wie sie Verbesserungen dieser Daten vorschlagen können erfahren Sie unter
http://www.data.gov/issue/?media_url=http://catalog.data.gov/dataset/mercury-in-biota-and-sediment-in-the-walker-river-basin-nevada-and-california Do you think this data is incorrect? Let us know