How does a giant clam feed on a coral reef?
Giant clams are large Indo-Pacific reef bivalves that host photosynthetic algal partners in their tissues.
Body plan, feeding and the marine environment
Gills filter plankton and organic particles from water, while symbiotic algae in the mantle produce organic matter with light and transfer part to the host. The clam provides carbon dioxide, nitrogenous waste and a protected light-exposed position. Colorful mantle pigments may help manage intense light. 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
Larvae disperse in currents and later settle on suitable hard surfaces, with some species becoming firmly attached as they grow. Overharvest, pollution, heat-related bleaching and reef loss are threats. Aquaculture needs genetic diversity and effective harvest control. 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.