Parasite infections in stickleback.

Prevalence (% fish infected), mean abundance (mean number of parasites per fish ± SE), and the site of infection of the 12 macroparasite taxa observed in lake and stream ecotypes of threespine stickleback from four lake systems (Wohlen, Biel, Constance and Geneva) in Switzerland. ‘Life cycle’ indicates whether the parasite life cycle includes only the fish host (direct life cycle) or also other host taxa (indirect life cycle). Previous host in the life cycle is given in parentheses.Parasite infections in stickleback.