Pacific Island Ecosystems Research Center

Publications

Filter Total Items: 454
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Year Published: 2016

Changes in the prevalence of avian disease and mosquito vectors at Hakalau Forest National Wildlife Refuge: a 14-year perspective and assessment of future risk

Throughout the main Hawaiian Islands, introduced mosquito-borne disease has had, and continues to have, a profound impact on the distributions and abundance of native Hawaiian forest birds. Populations of remaining native forest birds are largely restricted to high elevation forests where mean temperatures are marginal for vector and parasite...

LaPointe, Dennis; Gaudioso-Levita, Jacqueline M.; Atkinson, Carter T.; Egan, Ariel N.; Hayes, Kathleen

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Year Published: 2016

Abundance, distribution, and removals of feral pigs at Big Island National Wildlife Refuge Complex 2010–2015

The Hakalau Forest Unit (HFU) of Big Island National Wildlife Refuge Complex (BINWRC) has intensively monitored non-native ungulate presence and distribution during surveys of all managed areas since 1988. In this report we: 1) provide results from recent ungulate surveys and the number of removals at HFU to determine the distribution, abundance,...

Leopold, Christina R.; Hess, Steve C.; Kendall, Steve J.; Judge, Seth W.

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Year Published: 2016

Genetic diversity of Wolbachia endosymbionts in Culex quinquefasciatus from Hawai`i, Midway Atoll, and Samoa

Incompatible insect techniques are potential methods for controlling Culex quinquefasciatus and avian disease transmission in Hawai‘i without the use of pesticides or genetically modified organisms. The approach is based on naturally occurring sperm-egg incompatibilities within the Culex pipiens complex that are controlled by different...

Atkinson, Carter T.; Watcher-Weatherwax, William; Lapointe, Dennis

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Year Published: 2016

Winter distribution and use of high elevation caves as foraging sites by the endangered Hawaiian hoary bat, Lasiurus cinereus semotus

We examine altitudinal movements involving unusual use of caves by Hawaiian hoary bats, Lasiurus cinereus semotus, during winter and spring in the Mauna Loa Forest Reserve (MLFR), Hawai‘i Island. Acoustic detection of hoary bat vocalizations, were recorded with regularity outside 13 lava tube cave entrances situated between 2,200 to 3,600 m...

Bonaccorso, Frank; Montoya-Aiona, Kristina; Pinzari, Corinna A.; Todd, Christopher M.
Bonaccorso, F.J., K.M. Montoya-Aiona, C.A. Pinzari, and C. Todd. 2016. Winter distribution and use of high elevation caves as foraging sites by the endangered Hawaiian hoary bat, Lasiurus cinereus semotus. Hawaii Cooperative Studies Unit Technical Report. TR HCSU-068. University of Hawaii at Hilo, 28 pp.

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Year Published: 2016

Effects of Climate and land use on diversity, prevalence, and seasonal transmission of avian hematozoa in American Samoa

The indigenous forest birds of American Samoa are increasingly threatened by changing patterns of rainfall and temperature that are associated with climate change as well as environmental stressors associated with agricultural and urban development, invasive species, and new introductions of avian diseases and disease vectors. Long term changes in...

Atkinson, Carter T.; Utuzurrum, Ruth B.; Seamon, Joshua O.; Schmaedick, Mark A.; Lapointe, Dennis; Apelgren, Chloe; Egan, Ariel N.; Watcher-Weatherwax, William
Atkinson, C.T., R.B. Utzurrum, J. O. Seamon, M.A. Schmaedick, D.A. LaPointe, C. Apelgren, A.N. Egan, and W. Watcher-Weatherwax. 2016. Effects of Climate and land use on diversity, prevalence, and seasonal transmission of avian hematozoa in American Samoa. Hawaii Cooperative Studies Unit Technical Report. TR HCSU-072. University of Hawaii at Hilo, 52 pp.

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Year Published: 2016

Evaluating detection and monitoring tools for incipient and relictual non-native ungulate populations

Hawai‘i Volcanoes National Park (HAVO) encompasses 1,308 km2 on Hawai‘i Island. The park harbors endemic plants and animals which are threatened by a variety of invasive species. Introduced ungulates have caused sharp declines of numerous endemic species and have converted ecosystems to novel grazing systems in many cases. Local ranchers and the...

Judge, Seth W.; Hess, Steve C.; Faford, Jonathan K.J.; Pacheco, Dexter; Leopold, Christina R.; Cole, Colleen; Deguzman, Veronica
Judge, S.W., S.C. Hess, J.K. Faford, D. Pacheco, C.R. Leopold, C. Cole, and V. DeGuzman. 2016. Evaluating Detection and Monitoring Tools for Incipient and Relictual Non-native Ungulate Populations. Hawaii Cooperative Studies Unit Technical Report HCSU-069.

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Year Published: 2016

2015-2016 Palila abundance estimates

The palila (Loxioides bailleui) population was surveyed annually during 1998−2016 on Mauna Kea Volcano to determine abundance, population trend, and spatial distribution. In the latest surveys, the 2015 population was estimated at 852−1,406 birds (point estimate: 1,116) and the 2016 population was estimated at 1,494−2,385 (point estimate: 1,934)....

Camp, Richard J.; Brinck, Kevin W.; Banko, Paul C.

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Year Published: 2016

Comparative demographics of a Hawaiian forest bird community

Estimates of demographic parameters such as survival and reproductive success are critical for guiding management efforts focused on species of conservation concern. Unfortunately, reliable demographic parameters are difficult to obtain for any species, but especially for rare or endangered species. Here we derived estimates of adult survival and...

Guillaumet, Alban; Woodworth, Bethany L.; Camp, Richard J.; Paxton, Eben H.
Guillaumet, A., B.L. Woodworth, R.J. Camp, and E.H. Paxton. 2015. Comparative demographics of a Hawaiian forest bird community. Journal of Avian Biology, 46: 1-12.

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Year Published: 2016

Evaluating abundance and trends in a Hawaiian avian community using state-space analysis

Estimating population abundances and patterns of change over time are important in both ecology and conservation. Trend assessment typically entails fitting a regression to a time series of abundances to estimate population trajectory. However, changes in abundance estimates from year-to-year across time are due to both true variation in...

Camp, Richard J.; Brinck, Kevin W.; Gorresen, P.M.; Paxton, Eben H.
Camp, R.J, K.W. Brinck, P.M. Gorresen, E.H. Paxton. 2015. Evaluating abundance and trends in a Hawaiian avian community using state-space analysis. Bird Conservation International, 1:1-18.

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Year Published: 2015

Avian disease and mosquito vectors in the Kahuku unit of Hawai`i Volcanoes National Park and Ka`u Forest Reserve

While avian disease has been well-studied in windward forests of Hawai‘i Island, there have been few studies in leeward Ka‘u. We surveyed four altitudinal sites ranging from 1,200 to 2,200 m asl in the Kahuku Unit of Hawai‘i Volcanoes National Park (Kahuku) and three altitudinal sites ranging from 1,200 to 1,500 m asl in the Ka...

Gaudioso, Jacqueline; Lapointe, Dennis; Atkinson, Carter T.; Egan, Ariel N.
Gaudioso-Levita, J.M., D.A. LaPointe., C. T. Atkinson, and A.N. Egan. 2015. Avian disease and mosquito vectors in the Kahuku unit of Hawai`i Volcanoes National Park and Ka`u Forest Reserve. Hawaii Cooperative Studies Unit Technical Report. TR HCSU-070. University of Hawaii at Hilo, 45 pp.

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Year Published: 2015

Current land bird distribution and trends in population abundance between 1982 and 2012 on Rota, Mariana Islands

The western Pacific island of Rota is the fourth largest human-inhabited island in the Mariana archipelago and designated an Endemic Bird Area. Between 1982 and 2012, 12 point-transect distance-sampling surveys were conducted to assess bird population status. Surveys did not consistently sample the entire island; thus, we used a ratio estimator to...

Camp, Richard J.; Brinck, Kevin W.; Gorresen, P. Marcos; Amidon, Fred A.; Radley, Paul M.; Berkowitz, S. Paul; Banko, Paul C.
Camp RJ, Brinck KW, Gorresen PM, Amidon FA, Radley PM, Berkowitz SP, Banko PC. 2015. Current land bird distribution and trends in population abundance between 1982 and 2012 on Rota, Mariana Islands. Journal of Fish and Wildlife Management 6(2):511–540; e1944-687X. doi: 10.3996/112014-JFWM-085

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Year Published: 2015

Aerial-broadcast application of diphacinone bait for rodent control in Hawai`i: Efficacy and non-target species risk assessment

Introduced rats (Rattus rattus, R. exulans, and R. norvegicus) have been implicated in the decline or extinction of numerous species of plants and animals in Hawai‘i. This study investigated the efficacy of aerial-broadcast application of Ramik® Green baits containing 50 ppm (0.005%) diphacinone in reducing rat and mouse populations and...

Foote, David; Spurr, Eric B.; Lindsey, Gerald D.; Forbes Perry, Charlotte
Spurr, E. B., D. Foote, G.D. Lindsey, and C.F. Perry. 2015. Aerial-broadcast application of diphacinone bait for rodent control in Hawai`i: Efficacy and non-target species risk assessment. Hawaii Cooperative Studies Unit Technical Report. TR HCSU-0071. University of Hawaii at Hilo. 28 pp.