Why do nudibranchs use bright colors?
Nudibranchs are marine mollusks that lack an adult shell and display diverse colors and forms.
Body plan, feeding and the marine environment
Bright color can warn of toxicity or bad taste, while in other species it camouflages against sponges or corals. Dorsal gills or cerata assist gas exchange. Some nudibranchs store undischarged stinging cells from cnidarian prey in cerata tips and reuse them for defense. Relationships among marine invertebrates cannot be inferred from appearance alone because similar forms can evolve in different lineages. Pressure, light, temperature, salinity and currents shape feeding and movement. Laboratory observations may not represent the full behavior seen in nature.
Ecosystem function, defense and conservation
Specialized feeding on particular sponges, hydroids, corals or mollusks ties them to prey distribution. Most individuals have both male and female reproductive organs, yet mating still supports genetic diversity. Aquarium collection and reef damage can affect local species. These animals may shape ecosystems through filtration, decomposition, sediment mixing or reef building. Warming, deoxygenation, acidification, plastic, seabed damage and overharvest are considered together. Conservation targets habitat processes as well as individual species.