The relative importance of species invasions and sediment disturbance in regulating chemical dynamics in western Lake Erie

摘要: PCB congener concentrations were measured in aquatic biota and sediment from the western basin of Lake Erie during 1993–1994 1996–1997. Between these time periods round goby (Neogobius melanostomus) invaded proliferated mean annual particulate organic carbon (POC), dissolved (DOC) changed. The objectives this study to use a food web bioaccumulation model field data quantify relative importance goby, POC, DOC chemical concentration sediment, levels prior (1993–1994) since (1996–1997) invasion by gobies. predicted effects gobies on transfer, mediated through alterations structure, small increases (range 2–6%) burdens pelagic fish species such as alewife walleye. Larger 8–19%) for benthic feeding sport yellow perch largemouth bass. Small decreases 1–5%) result bioavailable PCBs water. Bioavailable water decrease observed changes POC concentrations. However, all cases fish, resulting structure DOC, smaller than those between 1993 1994 Increased attributed exposure older more heavily contaminanted sediments turbulence caused higher wind speeds 1996–1997 compared 1993–1994.