Journal of Aquatic Ecosystem Health
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Recovery in complex ecosystems
Journal of Aquatic Ecosystem Health - Tập 6 - Trang 181-187 - 1998
Current ecosystem theory has a deceptively simple representation of recovery. In actual practice,recovery is affected by the frequency and extent of disturbances and by the spatial heterogeneity of the ecological system. Environmental changes may pass through thresholds causing recovery to a different plant and animal community. The sheer complexity of the system combined with unanticipated synerg......
Integrating effects of contaminants across levels of biological organization: an overview
Journal of Aquatic Ecosystem Health - Tập 7 - Trang 113-116 - 2000
Effects of contaminants may occur at all levels oforganization, from molecular to ecosystem-levelresponses. While biochemical and physiologicalalterations in organisms may occur rapidly and areoften stressor-specific, the ecological relevance ofthese suborganismal indicators is uncertain.Alterations in populations and communities havegreater ecological relevance, but a firm mechanisticunderstandin......
Relations between resuspension and the content of 137Cs in freshwater fish in some Swedish lakes
Journal of Aquatic Ecosystem Health - Tập 4 - Trang 285-294 - 1995
In many Swedish lakes, the fallout of 137Cs from the Chernobyl accident in April 1986 has largely accumulated in the sediments. The availability and transfer of deposited 137Cs to biota is influenced by factors such as resuspension. The frequency of resuspension and the 137Cs-content of different fish species was studied in three shallow lakes in Uppland, central Sweden, and in one deeper lake in ......
Effect of food concentration on the chronic toxicity of sodium dodecyl sulphate to Daphnia magna
Journal of Aquatic Ecosystem Health - Tập 3 - Trang 247-253 - 1994
Food concentration supplied during subchronic and chronic toxicity tests, is one of the most important factors that might influence the response of test organisms to toxicants. The green microalga Scenedesmus incrassatulus was used as food for the cladoceran Daphnia magna, in a chronic toxicity test with the toxicant sodium dodecyl sulphate (SDS). Test concentrations were 0.625, 1.25, and 2.5 mg l......
Ethoxyresorufin O-deethylase (EROD) activity and fluctuating asymmetry (FA) in Zosterisessor ophiocephalus (Teleostei, Gobiidae) as indicators of environmental stress in the Venice lagoon
Journal of Aquatic Ecosystem Health - Tập 9 - Trang 239-247 - 2002
The impact of environmental stress on the grassgoby, Zosterisessor ophiocephalus, wasstudied at both biochemical and morphologicallevels, by comparing three sites in the Venicelagoon (the Northern, Central and Southernbasins) which differ in terms of the degree ofanthropogenic disturbance, in particular withregard to organic sediment contamination. At abiochemical level, the hepatic ethoxyresorufi......
Critical issues in sediment bioassays and toxicity testing
Journal of Aquatic Ecosystem Health - Tập 4 - Trang 151-156 - 1995
During the past few years there has been a tremendous increase in sediment bioassay and toxicity testing and research. The increased activity has paralleled the development of regulatory interest and realization of the role of contaminated sediments in ecosystem degradation. Many critical issues which affect test responses, data interpretation, and extrapolation to in situ conditions, have not bee......
Paleolimnology: an important tool for effective ecosystem management
Journal of Aquatic Ecosystem Health - - 1992
Implementation of a multiple biomonitoring approach to evaluate the potential for impact from an industrial discharge
Journal of Aquatic Ecosystem Health - Tập 3 - Trang 259-271 - 1994
Over a 2-year period, an industrial discharger implemented a program to determine if there was a potential for in-stream impact from its discharge, and, if necessary, to eliminate that potential. Six basic study designs were used. These included: (1) ambient toxicity tests using indicator organisms; (2) in-stream waste concentration (IWC) chronic testing using indicator organisms; (3) on-site flow......
Biozönotische untersuchungen über die strandarthropoden im bulgarischen küstenbereich des schwarzen meeres
Journal of Aquatic Ecosystem Health - Tập 3 - Trang 131-193 - 1951
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