http://vocab.lternet.edu/vocab/vocab/http://vocab.lternet.edu/vocab/vocab/skos/348mollusks http://vocab.lternet.edu/vocab/vocab/skos/348 invertebrates BT http://vocab.lternet.edu/vocab/vocab/skos/348 aquatic ecosystems RT http://vocab.lternet.edu/vocab/vocab/skos/348 gastropods NT