Effect of Intertidal Height on Basal Diameter of Balanus glandula


  • Moira Flagstand


This study explores the relationships between abiotic and biotic factors within the intertidal and
how they influence the size and composition of its inhabitants. Barnacles are often studied in
intertidal environments because of their prevalence and the role they play in the lives of other
intertidal organisms. The basal diameter sizes of the barnacle Balanus glandula were compared
between the low, mid, and high intertidal heights of the Vancouver, BC shoreline in October
2020. These three intertidal heights vary significantly with the presence of certain abiotic and
biotic factors that the organisms which live there are exposed to; and their effect on B. glandula
diameter was analyzed. No differences were found in the sizes of the barnacles from each height
of the intertidal, however, this may have been due to a few different causes. A more thorough
exploration of the relationship between intertidal height and barnacle size could lead to
interesting insights about the effects of predation, competition, weather, or desiccation on the
barnacle life cycle and growth rates.