[Green Crab Density 1973 to 2021] - Green Crab Density for Multiple Sites in the Gulf of Maine for 1973, 2003, 2017-2018 and 2021 (Local adaptation and the evolution of plasticity under predator invasion and warming seas: consequences for individuals, populations and communities)

Such variation is expected to initially favor plasticity in prey defenses but fixed defenses as invaders become established. This dataset contains green crab density (Carcinus maenas) data for multiple sites throughout the Gulf of Maine that were collected in 1973, 2003, 2017-2018 and 2021.

These data were used to examine historical changes in the latitudinal distribution of green crabs and their potential role in shaping spatiotemporal changes in snail (Littorina obtusata) shell thickness and thickness plasticity.