Fig. 1 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby

Fig. 1. Temporal changes in the mean abundance of Diplostomum spp. in spottail shiners (Notropis hudsonius) (green circle) and round gobies (Neogobius melanostomus) (black square) at two sites in the St. Lawrence River. Data are expressed as mean numbers of metacercariae of Diplostomum spp. per fish including uninfected ones ± SEM. Significant differences among years within each locality are indicated by different lower-case letters (round gobies) and upper-case letters (spottail shiners). Arrows within graph panels point to year of first sighting of the invasive round goby at each site. On the background map, sampling sites (̂Ilet Vert = IVT, ̂Iles de la Paix = IPA) are identified and the host species examined are represented by different fish silhouettes (green = spottail shiners, black = round gobies). Bird silhouettes indicate where main colonies of ring-billed gulls are localized: 2 = Beauharnois; 3 = ̂ILe Deslauriers. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)