Corals Tutorial (NOAA National Ocean Service)
NOAA National Ocean Service
A concise, accurate, free unit on the most-studied marine ecosystem. NOAA tutorial on coral biology: polyps and zooxanthellae symbiosis, growth and reproduction, how reefs form and where they occur, their ecological value, major threats such as warming, disease, pollution and fishing, and current conservation and restoration work.
More resources on Marine Biology
Smithsonian Ocean Portal
The most authoritative free general reference for marine organisms and ecosystems, and a good companion to either textbook. Free reference site from the Smithsonian National Museum of Natural History. It has species and ecosystem articles (reefs, seagrass, mangroves, deep sea), Census of Marine Life material, researcher profiles, conservation coverage and an educators' corner with lesson resources.
Tropical Coastal Ecosystems (UQx TROPIC101x)
University of Queensland course on coral reefs, seagrass meadows and mangroves, with lectures filmed at the Heron Island research station on the Great Barrier Reef. Covers ecosystem services, overfishing, pollution, warming and acidification, and management tools, and ends with a virtual field ecology project.
Marine Biology: Function, Biodiversity, Ecology (6th Edition)
Upper-level undergraduate textbook for biology majors and the step up from Castro & Huber. It is hypothesis-driven and data-heavy rather than descriptive. It explains marine life through physiology, evolution and quantitative ecology, covering plankton, benthos, reefs, the deep sea, fisheries and conservation, with emphasis on experimental evidence and primary literature.
Marine Biology (12th Edition)
Readable without a science background and more complete than any free alternative. Standard one-semester introductory textbook written for non-majors. It covers ocean physics and chemistry, then marine organisms from microbes to mammals, then ecosystems from the intertidal zone to the deep sea, then human impacts. Examples are drawn from regions worldwide.
Marine Biology
Five-module introductory course from the American Museum of Natural History covering how organisms adapt to ocean conditions, physical properties of marine environments, food webs and species interactions, blue whale biology, and conservation. Learners can explain how ocean conditions shape where marine species live.
MarineBio
Nonprofit online reference on ocean life run since 1998, with species profiles and photographs, introductory articles on marine biology and ocean ecosystems, and material on conservation threats. Students gain a broad grounding in marine organisms, their habitats and the pressures facing them.