Journal Article Research Support, Non-U.S. Gov't dissolved organic carbon fatty acids seaweed seaweeds 7440-44-0 Carbon Coal Dissolved Organic Matter Fatty Acids Fucales Laminariales Review bioactive compounds carbon carbon dioxide concentrating mechanism carbon sequestration carotenoids cool temperate exudation global ocean change habitat-forming intra-thallus variability macroalgae marine heatwaves nitrogen ocean acidification ocean carbon biogeochemical cycle ocean warming