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<br />;.,� 1: A uat To�cal. 2004 May 28;65(1): �-�2. Related Articles, Links
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<br />Responses of benthic fish exposed to contaminants in outdoor
<br />microcosms--examiningthe ecological relevance of previous
<br />laboratory toxicity tests.
<br />�ob�ans WA, Staub BP, Snod�rass J`W, Tavlor BE, DeBiase AE. Roe
<br />.� Jackson BP, Con�don �1.
<br />Savannah River Ecology Laboratory, University of Georgia, Drawer E,
<br />.Aiken, SC 29802, USA. hopl�ins@srel.edu
<br />Previous laboratory studies indicate that coal combustion wastes (a mixture
<br />composed of�sh and ather lower volume wastes such as bpttom ash;
<br />hereafter collectively referred to as ash) adversely affect the health of benthic
<br />fish (Erimyzon sucetta; lake chubsucker), but fish in these studies were
<br />provided with ample uncontaminated food resources. Because aquatic
<br />disposal of ash can also adversely affect food resources for benthic fish, we
<br />hypothesized that changes in resources might exacerbate the effects of ash on
<br />fish observed in laboratory studies We exposed juvenile E. sucetta in
<br />outdoor microcosms to water, sediment, and benthic resources from an
<br />ash-contaminated site or a reference site for 45 days and compared our
<br />findings to previous laboratory studies. Benthic invertebrate biomass was
<br />nearly three times greater in controls compared to ash microcosms. Total
<br />organic content of control sediment (41 %) was also greater than in ash
<br />sediments (17%), suggesting that additional benthic resources may have also
<br />been limited in ash microcosms. Benthic invertebrates isolated from the ash
<br />microcosms bad trace element concentrations (As, Cd, Co, Cr, Cs, Se, Sr,
<br />and V) up to 18 times higher than in weathered ash used 'm laboratory
<br />studies. The concentrations of trace elements accumulated by fish reflected
<br />the high dietary concentrations encountered 'm the ash microcosms and were
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