Archives of environmental contamination.

Long-term effects of dinoseb and paraquat, both individually and combined, on embryonic development and hatching success of Fasciola hepatica miracidia.

Environmental toxins; their impact on children's health.

Contamination of the environment by man-made and natural toxins has a direct impact on the health of children. This review considers how toxic contamination is identified and regulated, and highlights specific hazards.

Temperature preference of the crayfish Orconectes obscurus.

Acclimation temperature influenced the acute preferred temperature of the crayfish Orconectes obscurus. This species preferred a higher temperature than its acclimation temperature for those acclimation temperatures ranging from 6 degrees to 26 degrees C. When acclimated to 30 degrees and 33 degrees C, the crayfish preferred a lower temperature than its acclimation temperature. The final temper...

Contaminants of concern in Dutch marine harbor sediments.

The status of the contamination of Dutch marine harbor sediments was reevaluated after a period in which emissions from point sources had been greatly reduced. Data on sediment chemistry from 1999 and 2000 were assessed against screening levels (SLs) selected from available sediment quality guidelines and representing a low probability of adverse biological effects. This yielded a ranking of th...

Acute toxicity of aqueous copper, cadmium, and zinc to the mayfly Rhithrogena hageni.

Heptageniid mayfly nymphs have been suggested as sensitive indicators of metal contamination in streams based on biomonitoring studies, experimentation in situ, and experimentation in microcosm. Laboratory tests were conducted to evaluate the sensitivity of Rhithrogena hageni, a heptageniid mayfly, to waterborne copper, cadmium, and zinc. Tests were conducted with soft water (hardness = 40-50 m...