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Decaying macroalgae release nitrogen and other nutrients into the surrounding marine environment, providing nutrients for future generations of primary producers, as well as fueling a complex web of decomposer microorganisms. There are relatively few studies that examine macroalgal decomposition rates in areas impacted by macroalgal blooms, although fast-growing macroalgal bloom species typically decay more quickly than slow-growing perennial species. We studied whole tissue, organic content, and nutrient decay rates for five macroalgal species in Narragansett Bay, RI in the summer of 2010 using an intertidal litterbag design; four of these species are frequently present in macroalgal blooms in this system. Our results, which we present as logistic decay rates (-k d-), illustrate that the red alga Gracilaria vermiculophylla decomposes most rapidly, followed by green algae (Ulva rigida, Ulva compressa) and the red alga Agardhiella subulata; decay rates for these four species were significantly higher than that for the perennial, non-bloom forming brown alga Fucus vesiculosus. We did not observe refractory pools for any species, though we did not follow F. vesiculosus through the end of its decay process. Decay rates were dependent upon water temperature, with faster decomposition rates occurring during peak temperatures. We speculate that the slow decomposition of F. vesiculosus may be attributable to its relatively

VARIABILITY IN BIOMASS DECAY RATES AND NUTRIENT LOSS IN BLOOM-FORMING MACROALGAL SPECIES