Seashells are an important part of the coastal ecosystem and are crucial for the survival of various marine creatures.
They provide material for building nests of birds and also act as a substratum for attachment of algae, sea grass, sponges and various microbes.
Fishes use shells for hiding from predators, whereas hermit crabs use shells as temporary shelters.
Removal of seashells from seashores may also indirectly affect the rate of shoreline erosion.
Hence, in an attempt to protect the ecosystem, authorities in Andaman do not allow tourists to collect shells from beaches.