MCCLARY, JR., M.: Distribution of living barnacles in the tidal Hackensack River

The tidal Hackensack River of New Jersey contains sites where the barnacle, Balanus improvisus, lives, and sites where they once lived. To investigate the possibility of increasing the distribution of living barnacles, five of ten rocks from the site where the barnacles live were transplanted to the site where they once lived. The other five rocks were not transplanted (controls). After nine days, the number of barnacles alive and dead was counted. Although the decrease in the percentage of living barnacles on control rocks (from 62% to 58%) was not significantly different, the decrease in the percentage of living barnacles on transplanted rocks (from 70% to 14%) was significantly different (X²_{.05 (1)} = 3.841, P < 0.001). The results suggest that the distribution of living B. improvisus in the tidal Hackensack River can not be increased by dispersal. Biological, physical, and chemical factors will be tested in the future.