Manomet, Inc. 1 article published in JoVE Environment Assessing Intertidal Populations of the Invasive European Green Crab Marissa D. McMahan1 1Manomet, Inc. Understanding spatiotemporal patterns in green crab population dynamics is essential for predicting and managing the ecological and economic impacts of this harmful invasive species. This protocol was developed in an effort to create a standardized method for assessing green crab populations in the rocky intertidal zone of the Northwest Atlantic.