Chemical Contamination at National Wildlife Refuges in the Lower Mississippi River Ecosystem.

Metadata Updated: October 10, 2019

An investigation was made into chemical contamination at 26 National Wildlife Refuges in the Lower Mississippi River Ecosystem. Samples of water, sediment, and fish were collected, and passive sampling devices that accumulate persistent organic chemicals were deployed. Residues of current-use pesticides (CUPs), organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and mercury (Hg) were measured along with limited toxicity testing and exposure biomarkers. Organochlorine pesticides were detected at every refuge, and total DDT and toxaphene exceed published levels for the protection of fish or wildlife at nearly half the refuges. Current-use pesticides were detected at every refuge, but at only one-half the frequency as nearby off-refuge areas. Mixtures of multiple pesticides were often detected and their detection frequency was clearly associated with their use and persistence. About 25% of the refuges contained pesticides at concentrations exceeding aquatic-life criteria and over 65% ofthe off-refuge sites exceeded criteria. Concentrations of PCBs were low throughout the region, with no evidence of potential for adverse biological effects. Concentrations of PAHs were low throughout the region, except near oil and gas production facilities were very high concentrations caused I 00% mortality in sediment pore water toxicity tests. Concentrations of Hg in sediment and fish were generally below levels of concern. Overall, there was strong evidence that over one-half of the refuges are experiencing meaningful adverse biological effects from chemical contamination.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date May 1, 2019
Metadata Updated Date October 10, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 1, 2019
Metadata Updated Date October 10, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_37427
Brent Frakes
Maintainer Email
Public Access Level public
Bureau Code 010:18
Metadata Context
Metadata Catalog ID C:\Program Files (x86)\FWS\DataStore\Application\OpenData\FWS_ServCat_v1_1.json
Schema Version
Catalog Describedby
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Harvest Object Id 9b808d80-dbb9-41c8-bb85-7a8d7a6c9c09
Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 2001-02-01
Homepage URL
Data Last Modified 2001-02-01
Program Code 010:094, 010:028
Related Documents ""
Source Datajson Identifier true
Source Hash d59a564bf2354cc6b7656447d9920d2ad2d22ed9
Source Schema Version 1.1
Spatial -92.2837,29.15158,-89.1157,36.53932
Temporal 1992-01-01/2001-01-01
Category "Unpublished Report"

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