Pacific Island Ecosystems Research Center

Publications

Filter Total Items: 499
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Year Published: 2021

Transcriptome assembly and differential gene expression of the invasive avian malaria parasite Plasmodium relictum in Hawaiʻi

The malaria parasite Plasmodium relictum (lineage GRW4) was introduced less than a century ago to the native avifauna of Hawaiʻi, where it has since caused major declines of endemic bird populations. One of the native bird species that is frequently infected with GRW4 is the Hawaiʻi ʻamakihi (Chlorodrepanis virens). To achieve a better...

Videvall, Elin; Paxton, Kristina L.; Campana, Michael G.; Cassin-Sackett, Loren; Atkinson, Carter T.; Fleischer, Robert C.

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Year Published: 2021

Population density, distribution, and trends of landbirds in the National Park of American Samoa, Ta‘ū and Tutuila Units (2011–2018)

The National Park of American Samoa (NPSA) was surveyed for landbirds from June through July, 2018. Surveys were conducted using point-transect distance sampling methods to estimate bird densities. This information provides the second datum in the time-series of landbird monitoring for long-term trends in landbird distribution, density, and...

Judge, Seth; Camp, Richard J.; Vaivai, Visa; Hart, Patrick J.

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Year Published: 2021

Automated telemetry reveals post-reintroduction exploratory behavior and movement patterns of an endangered corvid, ʻAlalā (Corvus hawaiiensis) in Hawaiʻi, USA

Continuous movement monitoring is a powerful tool for evaluating reintroduction techniques and assessing how well reintroduced animals are adjusting to the wild. However, to date, continuous monitoring has only occurred for large-bodied species capable of carrying heavy tracking devices. In this study we used an automated VHF radio...

Smetzer, Jennifer R; Greggor, Alison L; Paxton, Kristina L.; Masuda, Bryce M; Paxton, Eben H.

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Year Published: 2021

Understanding metrics of stress in the context of invasion history: The case of the brown treesnake (Boiga irregularis)

Invasive species can exert rapid depletion of resources after introduction and, in turn, affect their own population density. Additionally, management actions can have direct and indirect effects on demography. Physiological variables can predict demographic change but are often restricted to snapshots-in-time and delayed confirmation of changes...

Claunch, N; Moore, I.; Waye, H; Schoenle, L; Oakey, S; Reed, Robert; Romagosa, Christina

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Year Published: 2021

Effectiveness of rapid 'ōhi'a death management strategies at a focal disease outbreak on Hawai'i Island

The ongoing spread of rapid ‘ōhi‘a death (ROD) in the Hawaiian Islands threatens the long-term sustainability of ‘ōhi‘a lehua (Metrosideros polymorpha) forests throughout the state. First identified in the Puna district of Hawai‘i Island in 2014, the disease caused by the novel fungi Ceratocystis lukuohia and Ceratocystis huliohia has now spread...

Roy, Kylle; Granthon, Carolina; Peck, Robert W; Atkinson, Carter T.

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Year Published: 2021

Freezing temperatures restrict woody plant recruitment and restoration efforts in abandoned montane pastures

Tropical montane forests are being lost at an alarming rate but harbor some of the globe’s most unique biodiversity. The Hawaiian archipelago is a prime example of the importance of high elevation forests to species conservation and persistence as they serve as the last refugia for Hawaiian birds. Yet these forests have been converted to invasive...

Rehm, Evan M; Yelenik, Stephanie G.; D'Antonio, Carla M.

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Year Published: 2021

Field trials to test new trap technologies for monitoring Culex populations and the efficacy of the biopesticide formulation VectoMax® FG for control of larval Culex quinquefasciatus in the Alaka'i Plateau, Kaua'i, Hawaii

Mosquito-borne avian malaria Plasmodium relictum is a key limiting factor for endemic Hawaiian forest birds. In the past decade, populations of Kaua‘i’s endemic forest birds have been in a steep decline due to an increase in malaria transmission. To evaluate the use of available biopesticides for short-term mosquito control we tested the efficacy...

Lapointe, Dennis; Black, Theodore V.; Riney, Michael; Tredinnick, Grace; Crampton, Lisa H.; Hite, Justin

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Year Published: 2020

Survival of Laysan Teal Anas laysanensis differs among island populations: Role of chronic avian botulism

Monitoring demographic response over time is valuable for understanding population dynamics of endangered species. We quantified the variation in survival patterns for three small isolated island populations of endangered waterfowl in the Hawaiian Archipelago. Laysan Teal Anas laysanensis were individually marked and the fate of 1,150...

Reynolds, Michelle H; Hatfield, Jeffrey; Courtot, Karen; Vanderlip, Cynthia

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Year Published: 2020

Divergent movement patterns of adult and juvenile ‘Akohekohe, an endangered Hawaiian Honeycreeper

The movement patterns of birds across a landscape are often highly variable and influenced by complex interactions between individuals and environments. Because periods of movement can be marked by high mortality, especially among juvenile birds, understanding these patterns may be vital for the conservation of many bird species. However, these...

Wang, Alex X; Paxton, Eben H.; Mounce, Hanna L; Gorresen, Paulo Marcos

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Year Published: 2020

2018 Kaua'i forest bird population estimates and trends

Kaua‘i's native forest birds have experienced steep declines since the beginning of systematic surveys in 1981, and declines have accelerated in recent decades. This report details the analysis of the most recent surveys conducted in 2018. Incorporating the new survey results, long-term trends continue to show sharp declines for all native...

Paxton, Eben H.; Brinck, Kevin W.; Crampton, Lisa H.; Hite, Justin; Costantini, Maria
Paxton, E. H., K. W. Brinck, L. H. Crampton, J. Hite, and M. Costantini. 2020. 2018 Kaua'i forest bird population estimates and trends. Hawai`i Cooperative Studies Unit Technical Report HCSU-TR096, University of Hawai'i at Hilo, Hilo, Hawai‘i. Available: http://hdl.handle.net/10790/5507.

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Year Published: 2020

Introduction to life cycles, taxonomy, distribution and basic research techniques

Avian haemosporidian parasites are a closely related group of apicomplexan parasites with important similarities in their life cycles, development, physiology, and reproduction. Current phylogenies based on mitochondrial and nuclear genes reflect more traditional attempts to classify these organisms based on life history characteristics and...

Valkiunas, Gediminas; Atkinson, Carter T.

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Year Published: 2020

Decontamination of Ceratocystis pathogens responsible for rapid ʻŌhiʻa Death

Rapid ʻōhiʻa death (ROD) is caused by two recently described species of Ceratocystis, C. lukuohia and C. huliohia. These fungi are decimating ʻōhiʻa lehua (Metrosideros polymorpha), the keystone native tree species of Hawaiʻi. Viable Ceratocystis propagules can persist in ambrosia beetle frass (Coleoptera:...

Roy, Kylle; Jaenecke, Kelly; Bjontegard, Nikko; Mikros, Dan; Dunkle, Ellen; Yanger, Corie; Sugiyama, Lionel S.; Keith, Lisa M.; Peck, Robert W