Abstract：
:Burrowing mayflies (Hexagenia bilineata) were analyzed to assess longitudinal patterns in their cadmium and mercury content along the upper Mississippi River. Emergent mayflies (subimagoes and imagoes) were collected in 1988 at 34 sites (25 navigation pools), extending 1260 km from Little Falls, Minnesota, downstream to St. Louis, Missouri. Cadmium concentrations in composite samples of whole mayflies ranged from 7 to 219 ng/g dry weight in females and from less than 7 to 265 ng/g in males. Cadmium concentrations were highest (greater than or equal to 150 ng/g) in samples from Pools 2 and 3 (downstream from the Twin Cities metropolitan area), 15 (near the Quad Cities metropolitan area), and 27 (near the St. Louis metropolitan area). Cadmium concentrations in female mayflies decreased significantly with distance downstream from Pool 2 at river mile 825 to Pool 9 at river mile 648, paralleling spatial trends in the cadmium contamination of sediments in the reach downstream from the Twin Cities metropolitan area, reported in earlier studies; cadmium burdens in mayflies followed a similar spatial trend. Concentrations of mercury were much less variable, ranging from 44 to 102 ng/g dry weight in female mayflies and from 60 to 177 ng/g in males; concentrations and burdens were highest in mayflies collected at Pools 2, 20, 22, 25, and 27. Mercury concentrations in females decreased significantly with distance downstream from Pool 2 at river mile 825 to Pool 5A at river mile 728.5. Concentrations of mercury and cadmium in composite samples of female mayflies were not correlated, indicating dissimilar longitudinal patterns in concentrations of the two metals.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Arch Environ Contam Toxicoljournal_title
Archives of environmental contamination and toxicologyauthors
Dukerschein JT,Wiener JG,Rada RG,Steingraeber MTdoi
10.1007/BF00226003subject
Has Abstractpub_date
1992-07-01 00:00:00pages
109-16issue
1eissn
0090-4341issn
1432-0703journal_volume
23pub_type
杂志文章abstract：:In this study, we examine the relative contribution of water and live prey (Tubifex tubifex) as sources of nickel (Ni) and thallium (Tl) in juvenile fathead minnows (Pimephales promelas). Overall, both water and prey were important sources of metals for our fish, although only approximately 35% of the metal estimated ...
journal_title：Archives of environmental contamination and toxicology
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journal_title：Archives of environmental contamination and toxicology
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