Demographic Studies on Hawaii's Endangered Tree Snails: Partulina proxima
Demographic Studies on Hawaii's Endangered Tree Snails: Partulina proxima
dc.contributor.author | Hadfield, Michael G. | |
dc.contributor.author | Miller, Stephen E. | |
dc.date.accessioned | 2008-04-13 | |
dc.date.available | 2008-04-13 | |
dc.date.issued | 1989-01 | |
dc.description.abstract | Populations of the tree snail Partulina proxima, endemic to higher elevations of Molokai, Hawaiian Islands, were studied for 3 years. Analyses of the data derived from 17bimonthly mark-recapture events determined that each tree harbors a small, mostly nonmigratory population of 8-26 snails of which 2-4 are adults; the snails average 4.2 mm long at birth and 21.3 mm long when growth stops; growth is slow, with maturity reached in 5-7 years; annual fecundity averages 6.2 offspring per adult; and mortality is about 98% over the first 4 years of life. Given the high rate of juvenile mortality, adult snails must reproduce for at least 12 years to replace themselves. From this we calculate a minimum maximal life-span of 18-19 years. We conclude that the current high rate of unexplained juvenile mortality, combined with lat e age at first reproduction and low fecundity, place this species at very high risk to any sort of perturbation, particularly any selective predation on adults. | |
dc.identifier.citation | Hadfield MG, Miller SE. 1989. Demographic studies on Hawaii's endangered tree snails: Partulina proxima. Pac Sci 43(1): 1-16. | |
dc.identifier.issn | 0030-8870 | |
dc.identifier.uri | http://hdl.handle.net/10125/1197 | |
dc.language.iso | en-US | |
dc.publisher | University of Hawaii Press | |
dc.title | Demographic Studies on Hawaii's Endangered Tree Snails: Partulina proxima | |
dc.type | Article | |
dc.type.dcmi | Text |
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