摘要：For 22 days, we tracked the movements of radio-tagged Arctic grayling and mountain whitefish before, during and after the open-cut installation of a natural gas pipeline underneath the Wildhay River, Alberta. During the study, radio tagged fish were often sedentary (40% of daily observations). Most of the recorded daily movements occurred within the first three to four days after surgical implantation of radio-transmitters. Since there was no identifiable avoidance pattern by fish relative to increased sediment load, the few movements by downstream fish related to construction were probably motivated by disturbances such as blasting or equipment movement. The absence of any avoidance response is attributed to the relatively low suspended sediment concentrations during construction, the lack of habitat alteration, and natural events (spring run-off or storm events) causing equal or greater periods of sediment exposure.
