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Bioavailability of Environmental Contaminants on the Upper Mississippi River National Wildlife and Fish Refuge Associated with Water Level Management on Upper Mississippi River Pool 8

Summary

Type of release
a one-off release of a single dataset

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Release Date
24 April 2014
Modified Date
27 August 2015
Publishers
US Fish and Wildlife Service, Department of the Interior
Keywords
elemental-contaminants, environmental-contaminants-investigation, habitat, mercury, ocs, organchlorine, tree-swallows
Identifier
bioavailability-of-environmental-contaminants-on-the-upper-mississippi-river-national-wild
Landing Page
http://catalog.data.gov/dataset/bioavailability-of-environmental-contaminants-on-the-upper-mississippi-river-national-wild
Maintainers
Richard Easterbrook richard_easterbrook@fws.gov

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Description

The U.S. Army Corps of Engineers coordinated with a variety of state and federal resource management agencies, the river transportation industry, and the public to conduct a water drawdown on Navigation Pool 8 of the Upper Mississippi River during the summers of 2001 and 2002 to increase aquatic vegetation production and thereby improve fish and wildlife habitat on the Upper Mississippi River National Wildlife Fish Refuge. Flooding of previously dried wetlands, however, may increase the rate of mercury methylation and make mercury more available to terrestrial vertebrates that feed in aquatic environments. Our objective was to determine if mercury, other elements, and organochlorine contaminants were more available to vertebrates following the 2001 drawdown. Tree swallow Tachycineta bicolor eggs and nestlings were collected at two sites on Pool 8 and a nearby reference site in 2000 pre2001 drawdown, 2001 pre2001 drawdown and 2002 post2001 drawdown and tissues were analyzed for mercury, other elements, and organochlorine contaminants. Bioindicator measurements of genetic damage, oxidative stress, ethoxyresorufinOdealkylase activity, and the ratio of liver to nestling mass were also measured in nestlings at all sites and all years. Based on a multivariate analysis, the 2001 drawdown of Pool 8 did not influence element concentrations, organochlorine concentrations, or bioindicator response. Concentrations of inorganic and organochlorine contaminants in tree swallow eggs and nestlings were not at toxic levels. Hatching success did not differ among years and was comparable to the nationwide average. These results demonstrated that the Pool 8 drawdown achieved Refuge habitat management goals without increasing risks due to enhanced contaminant bioavailability. However, resource managers should not assume that the same results will be realized in other UMR navigation pools with higher levels of environmental contaminants andor a different drawdown scenario. Results may also be used to assist environmental education and to inform other habitat enhancement projects within Pool 8.

General Information

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This dataset has been created by US Government which means it is required to be in the public domain. However US copyright law only allows open access by US citizens, we have assumed the data is equivalently licensed as CC0 for the rest of the world as this is in the spirit of the US Government’s Open Data policy.

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