Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Ronald G. Rada"'
Publikováno v:
Journal of Molluscan Studies. 69:101-106
Freshwater mussels are emersed (exposed to air) during conservation activities such as surveys and relocations. Success of these activities depends upon the ability of mussels to survive emersion and to re-burrow in the substratum. We evaluated the a
Publikováno v:
Environmental Toxicology and Chemistry. 19:1523-1531
Cadmium was quantified in the surface sediments of six seepage lakes ranging from 8 to 70 ha in surface area, 6 to 20 m in maximum depth, 5.2 to 7.0 in mean epilimnetic pH, and 1.7 to 6.8 mg·L−1 in dissolved organic carbon. Within each lake, dry-w
Publikováno v:
Canadian Journal of Fisheries and Aquatic Sciences. 57:1062-1072
The distribution and deposition of sedimentary mercury in the Sudbury River were linked to an industrial complex (Nyanza site) that operated from 1917 through 1978. In two reservoirs just downstream from the Nyanza site, estimated rates of mercury ac
Autor:
D. Kent Johnson, Ronald G. Rada, Michelle R. Bartsch, W. Gregory Cope, John E. Rupprecht, Steven J. Balogh, R. David Young
Publikováno v:
Environmental Science & Technology. 33:4385-4390
Zebra mussels (Dreissena polymorpha) were sampled from artificial substrates deployed from May 30 to October 19, 1995, at 19 locks and dams from Minneapolis, MN, to Muscatine, IA. Analyses of composite tissue samples of zebra mussels (10−20-mm leng
Autor:
Ronald G. Rada, Craig E. Williamson, Donald P. Morris, James G. Wiener, Thomas M. Frost, Timothy K. Kratz, Maria J. Gonzalez, Katherine E. Webster, Pamela K. Montz, Tracy Badillo, Patrick L. Brezonik, Carl J. Watras
Publikováno v:
Limnology and Oceanography. 44:784-794
A single stress, acidification with sulfuric acid, was applied to Little Rock Lake in a whole-ecosystem manipulation. We documented a wide range of responses to the acidification, including increases in the concentrations of various chemicals, shifts
Publikováno v:
Environmental Science & Technology. 33:999-1003
We examined the influence of maternal mercury and selected lacustrine variables on the mercury content of eggs from yellow perch (Perca flavescens). Total mercury, methylmercury, and inorganic mercury were determined in eggs and carcasses (less eggs)
Publikováno v:
Water, Air, and Soil Pollution. 109:277-292
We assessed accumulation of cadmium (Cd) and bioturbation by nymphs of the burrowing mayfly Hexagenia bilineataas indicators of exposure to Cd-spiked sediment in a 21-d test. Surficial sediments (top 5 cm) from Pool 7 of the Upper Mississippi River w
Publikováno v:
Journal of the North American Benthological Society. 17:121-128
In long-lived unionid mussels, many short-term measures of growth are of limited value. Changes in physiological condition may be an early indication of stress, because the increased energy demand associated with stress often results in a depletion o
Publikováno v:
Hydrobiologia. 323:61-66
Sediment traps are being used in some pollution monitoring programs in the USA to sample suspended solids for contaminant analyses. This monitoring approach assumes that the characteristics of solids obtained in sediment traps are the same as those c
Publikováno v:
Regulated Rivers: Research & Management. 11:175-184