An Assessment of Nysius wekiuicola Populations and Thermal Microhabitat Conditions on Cinder Cones of the Maunakea Volcano, Hawai‘i

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dc.contributor.advisorEiben, Jesse A.
dc.contributor.authorKirkpatrick, Jessica Ann
dc.contributor.departmentTropical Conservation Biology & Environmental Science
dc.date.accessioned2018-07-02T23:59:05Z
dc.date.available2018-07-02T23:59:05Z
dc.date.issued2018-02
dc.description.abstractThe endemic Hawaiian wēkiu bug (Nysius wekiuicola) is a carnivorous scavenger that only inhabits volcanic cinder cones above ~3,500 m elevation on the mountain, Maunakea, Hawai‘i. As a species of conservation concern threatened by invasive species, climate change, and habitat alteration, a greater understanding of wēkiu bug populations and habitat use through time is needed to inform habitat restoration efforts and conservation management decisions. In this study, locations on a high elevation and a lower elevation cinder cone were sampled using attractant traps in a buffered random design six times from June 2016- 2017 to examine wēkiu bug distribution patterns within cinder cone habitats and across seasons. A generalized linear mixed model (GLMM) was used to explore the relative importance of cinder cone characteristics (topographic aspect, surficial minerals, and elevation) hypothesized to influence wēkiu bug distributions. Additionally, thermal conditions were described and compared within the insects’ habitat (within 2-30 cm depth of cinder substrate). Results indicate that wēkiu bugs had a highly aggregated distribution, with up to 40 times higher bug densities at the higher elevation cinder cone, and the density of bugs changed within and between cinder cones throughout the year. Our GLMM indicated that sample month, topographic aspect, and elevation on a cinder cone influences wēkiu bug distributions with abundance increasing with elevation within a cinder cone, and the highest captures are predicted to be on the northeast aspects of the higher elevation cinder cone year-round. Temperature data shows multiple microclimates exist throughout cinder cone habitats at any given time, and the ash substrate layer could provide an important habitat refuge for the wēkiu bug, as this layer rarely freezes. We recommend preserving contiguous cinder cone habitats for the persistence of the wēkiu bug, and monitoring populations in a random sample design in known or restored habitats to effectively monitor wēkiu bug densities.
dc.description.degreeM.S.
dc.description.institutionUniversity of Hawaii at Hilo
dc.format.extent112 pages
dc.identifier.urihttp://hdl.handle.net/10790/3502
dc.language.isoeng
dc.subjectConservation biology
dc.subjectWildlife management
dc.subjectEntomology
dc.subjectAlpine Stone Desert
dc.subjectCinder Cones
dc.subjectHabitat Restoration
dc.subjectMaunakea
dc.subjectMicrohabitat
dc.subjectWēkiu bug
dc.titleAn Assessment of Nysius wekiuicola Populations and Thermal Microhabitat Conditions on Cinder Cones of the Maunakea Volcano, Hawai‘i
dcterms.rightsAll UHH dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
local.identifier.alturihttp://dissertations.umi.com/hilo.hawaii:10146

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