Sources of Dissolved Organic Matter in Rocky Intertidal Zones: Optical Characterization of Photochemically Released Dissolved Organic Matter from Rockweed (Esp. Fucus spiralis, Fucus vesiculosus and Ascophyllum nodosum) and Rockweed Detritus

John R Helms, Nicci A McGuire and Oscar Alvarez Cancel, Morningside College, Biology and Chemistry Department, Sioux City, IA, United States