Within rocky intertidal communities, trampling from human visitation may be an important ecological stressor influencing community biodiversity (Addessi 1994; Olson 2009; Werfhorst and Pearse 2007; Pour et al. 2013). Little information is known regarding the biodiversity of macroinvertebrates within the rocky intertidal zone of Acadia National Park (ANP). Three paired sample areas were surveyed along the western side of ANP including locations near Bass Harbor Head, Ship Head Harbor and Wonderland located in Southwest Harbor. All macroinvertebrate individuals were identified or noted as unidentified and counted. A total of 26 species and 37,230 individuals were recorded within the quadrats sampled in the study. No significant difference was found between high and low visitation or across paired sites although patterns could be seen. Further studies need to be conducted to effectively determine the severity of human disturbance on the biodiversity of ANPs macroinvertebrates.

Data was collected randomly at three paired sites in Acadia National Park: Bass Harbor Head, Ship Harbor Head, and Wonderland. All organisms were counted and identified. Any unknown organisms were photographed and identified at a later time. Data was entered into Excel and processed by inputting formulas for the biodiversity indices. Once obtained, data was then run through SPSS to do statistical analyses.