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Conservation Status of Tree Snail Species in the Genus Partulina (Achatinellinae) on the Island of Hawai'i: A Modern and Historical Perspective

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Title:Conservation Status of Tree Snail Species in the Genus Partulina (Achatinellinae) on the Island of Hawai'i: A Modern and Historical Perspective
Authors:Hadway, Lisa J.
Hadfield, Michael G.
Date Issued:Jan 1999
Publisher:University of Hawai'i Press
Citation:Hadway LJ, Hadfield MG. 1999. Conservation status of tree snail species in the genus Partulina (Achatinellinae) on the Island of Hawai'i: a modern and historical perspective. Pac Sci 53(1): 1-14.
Abstract:The Hawaiian tree snail genus Partulina, from Maui, Moloka'i,
Uina'i, O'ahu, and the island of Hawai'i, is the sister-genus of the endangered
Achatinella, found only on the island of O'ahu. Life histories of species in the
two genera are similar, and undoubtedly the Partulina species have been as
severely impacted by the collective effects of habitat destruction and introduced
predators as have those of the genus Achatinella. Three species of Partulina
have been described from the island of Hawai'i: Partulina physa, P. confusa,
and P. horneri. Until 1992, there were no recorded sightings of these species for
more than 46 yr. Historically, Partulina spp. were recorded at various locations
in almost all districts of the island of Hawai'i, including North and South
Kona, North and South Kohala, Hamakua, North and South Hilo, and Puna.
Partulina physa was found nearly islandwide, whereas P. confusa and P. horneri
were mostly located in the Hamakua and Kohala Districts. Partulina confusa
and P. horneri were not found in the current surveys. Extensive field surveys on
the island of Hawai'i between May 1995 and December 1997 resulted in the
location of only one population of Partulina physa, inhabiting a narrow range
in the Kohala Mountains. The shell length and reproductive state were recorded
for 82 individuals of P. physa from that population. Mean adult shell
length was 15.08 mm. Habitat loss, much of which occurred between 200 and
100 yr ago, has likely been the greatest factor contributing to the decline of the
Partulina spp. of the island of Hawai'i. Predation and shell collecting, and
possibly climatic changes and pathogens, have also contributed to the decline of
the Partulina species on Hawai'i Island. A small captive population of P. physa
at the University of Hawai'i at Manoa has suffered high juvenile mortality
Appears in Collections: Pacific Science Volume 53, Number 1, 1999

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