Stomach content of stickleback from the Lake Constance offshore site, and from the lake and stream site in the COW system.

1Daphnia, Ceriodaphnia, Bosmina.2Chydoridae.3mainly Ostracoda.4Chironomidae, Ceratopogonidae.5mainly Ephemeroptera and Plecoptera.The values represent the proportion of the total prey items accounted for by each prey class, averaged across individuals within each site (standard deviation in parentheses). The copepods category subsumes pelagic, benthic, and/or generalist taxa difficult to distinguish; strictly pelagic calanoid copepods, however, were found in the offshore lake specimens only. Sample size is 5, 20, and 7 for offshore, COW lake, and COW stream.