| concentrations of organochlorine pesticides and polychlorinated biphenyls in amphipods (gammarus lacustris) along an elevation gradient in mountain lakes of western canada. | populations of the amphipod gammarus lacustris were examined for their concentrations of organochlorine pesticides and polychlorinated biphenyls (pcbs) from seven lakes spanning a 1,300-m elevation gradient in alberta, canada. the concentrations of several of the semivolatile organochlorine compounds ([svocs], vapor pressure > 0.03 pa at 20 degrees c) increased at higher altitudes. this pattern was generally not observed among the less volatile organochlorines ([lvocs]. vapor pressure < 0.03 pa ... | 2003 | 14587899 |