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Title: Status of Tree Snails (Gastropoda: Partulidae) on Guam, with a Resurvey of Sites Studied by H. E. Campton in 1920 
Author: Hopper, David R.; Smith, Barry D.
Date: 1992-01
Publisher: University of Hawai'i Press
Citation: Hopper DR, Smith BD. 1992. Status of tree snails (Gastropoda: Partulidae) on Guam, with a resurvey of sites studied by H. E. Campton in 1920. Pac Sci 46(1): 77-85.
Abstract: Tree snails of the family Partulidae have declined on Guam since
World War II. One species, indigenous to the western Pacific, Partula radiolata,
is still locally common along stream courses in southern areas of the island. The
Mariana Island endemic Samoana fragilis is present but not found in abundance
anywhere on Guam. Partula gibba, another Mariana endemic, is currently
known only from one isolated coastal valley along the northwestern coast, and
appears to be in a state of decline. The Guam endemic Partula salifana was not
found in areas where it had been previously collected by earlier researchers, and
is thus believed to be extinct. The decline and extinction of these snails are related
to human activities. The single most important factor is likely predation by snails
that were introduced as biological control agents for the giant African snail,
Achatina fulica. The current, most serious threat is probably the introduced
flatworm Platydemus manokwari. This flatworm is also the likely cause of
extinctions of other native and introduced gastropods on Guam and may be the
most important threat to the Mariana Partulidae.
ISSN: 0030-8870

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