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Seasonality in Low Intertidal Benthic Marine Algal Communities in Central Puget Sound, Washington, USA

The species composition, number of species, and percentage cover of algae found on low littoral rocky substrata in Central Puget Sound, Washington, were sampled seasonally for two years. Algal cover (primarily green algae) was highest during summer and autumn, and lowest in winter. Fluctuations in algal cover were positively correlated with air temperature and sunlight, and negatively correlated with precipitation. The number of species present peaked in spring when water temperature was still low and sunlight (intensity and duration) was high. Principal components analysis indicated that changes in water temperature and a desiccation-cold stress factor were of primary importance, and that air temperature, precipitation and sunlight were of secondary importance in causing fluctuations in species composition over time.