||Metabolism of mercury compounds in microorganisms /
Colwell, Rita R., ;
Nelson, Jr., John D.
||Maryland Univ., College Park. Dept. of Microbiology.;Environmental Research Lab., Narragansett, R.I.
|| U.S. Environmental Protection Agency, Environmental Research Laboratory ; Available from NTIS,
Chesapeake Bay ;
Marine biology ;
Marine microorganisms ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||x, 84 pages : illustrations, map ; 28 cm.
The report describes the physiology and ecology of mercury-resistant and mercury-metabolizing bacteria from Chesapeake Bay. Evidence is presented which establishes a role for bacteria in the cycling of mercury in the estuarine environment. From the results of a survey of elemental mercury production among a group of randomly selected, HgCl2-resistant bacteria and mixed natural microbial populations, it was established that the enumeration of mercury-resistant bacteria by plate counting is a valid index of potential Hg(+2) metabolism in situ. The distribution of mercury-resistant bacteria was significantly different in water and sediment, from station to station, and seasonally; the proportion of Hg(+2)- resistant bacteria among the total, viable, heterotrophic bacterial population reached a reproducible maximum in Spring and was positively correlated with water turbidity, dissolved oxygen concentration, and mercury concentration in the sediment. These findings suggest that bacteria may contribute substantially to the mobilization and transformation of mercury from existing deposits in Chesapeake Bay.
Grant no. 802529. Includes bibliographical references (pages 74-80). Microfiche.