In this series of hands-on activities youth learn about harmful and shifting species in the Gulf of Maine. Using native and invasive crab species as a case study, youth engage in games, simulations, and scientific observations. Through these activities they get to know the importance of food webs and the impacts of invasive species and a changing environment on ecosystems. For grades 4-5. To register email childrenscirc@patten.lib.me.us or call 207-443-5141 x1016. Week 1: All about ecosystems! Week 2: Invasive species:…