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Development of tree snail protection enclosures: From design to implementation

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Title:Development of tree snail protection enclosures: From design to implementation
Authors:Rohrer, Jobriath
Costello, Vincent
Tanino, Jamie
Bialic-Murphy, Lalasia
Akamine, Michelle
show 3 moreSprague, Jonathan
Joe, Stephanie
Smith, Clifford
show less
Keywords:Predator proof fence
Achatinella mustelina
endangered tree snails
LC Subject Headings:snails - Hawaii
Date Issued:Mar 2016
Publisher:Pacific Cooperative Studies Unit, University of Hawaii at Manoa
Citation:Rohrer J, Costello V, Tanino J, Bialic-Murphy L, Akamine M, Sprague J, Joe S and Smith C. 2016. Development of tree snail protection enclosures: From design to implementation. Pacific Cooperative Studies Unit, University of Hawaii at Manoa. Technical Report, 194. Honolulu, HI. 58 pages.
Series:Technical Report;194
Abstract:The Hawaiian land snails in the endangered, endemic genus Achatinella have experienced major declines in population and distribution over the last 100 years. Threats to Achatinella today include invasive, non‐native predators (Euglandina rosea, Rattus rattus and Trioceros jacksonii), habitat degradation due to human disturbance and possibly climate change, and historically, collection by humans. The O‘ahu Army Natural Resources Program (OANRP) is required to stabilize select remaining populations of A. mustelina. Stabilization goals are to maintain 300 mature snails at eight managed sites and control threats within sites. This report describes OANRP efforts to combat invasive predators by means of predator‐free and ‐proof snail enclosures. A couple of prior attempts at excluding predatory snails were marginally successful but the identification of additional predators required substantial additional barriers. The design and construction of the enclosure at Pu‘u Hapapa is used as a case study. This report includes detailed information on the physical development of predator‐proof barriers, construction and costs. Additional needs for monitoring and maintenance, predator removal, Achatinella reintroduction, Achatinella population monitoring, and habitat improvement were also developed.
Description:Reports were scanned in black and white at a resolution of 600 dots per inch and were converted to text using Adobe Paper Capture Plug-in.
Appears in Collections: The PCSU and HPI-CESU Technical Reports 1974 - current

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