Assignment task: In the 1970s, Enos Lake on Vancouver Island in British Columbia was found to contain populations of benthic and limnetic sticklebacks, similar to those in Paxton Lake. In the late 1990s, non-native crayfish used as bait by people fishing for trout escaped and established a large population in Enos Lake. These crayfish feed in the benthic zone, where they eat aquatic plants, insects, snails, and tadpoles. They have grazed down the benthic vegetation, which used to be lush. The benthic zone is now very silty, with low water clarity, because the crayfish stir up the sandy bottom as they move about and look for prey. Researchers have collected data about the proportions of benthic, limnetic, and hybrid sticklebacks in Enos Lake, following the crayfish invasion. What do you predict the researchers found, and why?