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Aim To provide the first regional analysis of contemporary drivers of Pacific Island fire regimes. Location Islands of Palau, Yap, Guam, Rota, Tinian, Saipan, Chuuk, Pohnpei, Kosrae. Time Period 1950-present. Methods We used land cover, soil maps and contemporary fire histories to (1) describe the relationships among fire activity, vegetation, rainfall and island geography and population; (2) examine the spatial associations of forest and savanna vegetation with respect to fire and soil types; and (3) link fire and savanna distribution to intra-annual and inter-annual rainfall variability. Results Savanna extent was positively correlated with island age and the range of mean monthly rainfall. The percent of area...
Categories: Publication;
Types: Citation
This report identifies needs and opportunities in the United States Affiliated Pacific Islands (USAPI) region relative to climate change science, management, and adaptation strategies. The region includes the territories of Guam and American Samoa, the Commonwealth of the Northern Marianas (CNMI), and the independent states of Palau, Federated States of Micronesia (FSM), and the Republic of the Marshall Islands (RMI). This inventory is responsive to the Pacific Islands Climate Science Center (PICSC) Strategic Science Agenda and its articulation with the region.
Indigenous communities make up less than 5% of the world’s population while stewarding 85% of biodiversity on the planet. In Hawaii, Native Hawaiian language resources, including proverbs, stories, and chants, provide glimpses to how people adapted with environmental rhythms, seasons, and offerings. Drought, the absence of water for agricultural, economic, and social use for a period, is important as a main water resource in Hawai‘i are clouds captured and purified by high island mountains in the middle of the Pacific Ocean. This research provides insight on Native Hawaiian relationships to drought historically as well as current practices within community-based management. Of importance are historical records of...
Categories: Publication;
Types: Citation
Reducing coral reef vulnerability to climate change requires that managers understand and support the natural resilience of coral reefs. We define coral reef resilience as: the capacity of a reef to resist and/or recover from disturbance given its probable exposure regime, and maintain provision of ecosystem goods and services. Spatial variation in exposure to disturbance and the resilience of reefs in the face of those disturbances will determine the fate of coral reefs within management jurisdictions. This project sought to: (1) undertake ecological resilience assessments in the Commonwealth of the Northern Mariana Islands (CNMI), which is in the west Pacific near Guam, and (2) collaboratively develop a decision-support...
Categories: Publication;
Types: Citation;
Tags: Climate Change,
Coral Reef,
Coral Reefs,
Mariana Islands,
Pacific Islands CASC,
This final report is for the Pacific Islands CSC funded project "Very Fine Resolution Dynamical Downscaling of Past and Future Climates for Assessment of Climate Change Impacts on the Islands of O`ahu and Kaua`i".
Abstract (from http://www.bioone.org/doi/abs/10.2112/JCOASTRES-D-13-00202.1): Traditional long-term (decadal) and large-scale (hundreds of kilometers) shoreline change modeling techniques, known as single transect, or ST, often overfit the data because they calculate shoreline statistics at closely spaced intervals along the shore. To reduce overfitting, recent work has used spatial basis functions such as polynomials, B splines, and principal components. Here, we explore an alternative to such basis functions by using regularization to reduce the dimension of the ST model space. In our regularized-ST method, traditional ST is an end member of a continuous spectrum of models. We use an evidence information criterion...
Categories: Publication;
Types: Citation;
Tags: B splines,
Data Visualization & Tools,
Pacific Islands CASC,
Science Tools For Managers,
Sea-Level Rise and Coasts,
The Hawaiian Islands are home to a variety of native species that have been subject to numerous threats including development of habitat for human use, predation by introduced herbivores, and competition with invasive plant species. In addition to these threats global climate change is expected to increase temperature and alter patterns of precipitation in Hawaii. This project models the relative vulnerability of native plant species to the effects of climate change, in order to assist resource managers in effectively allocating limited resources to efficiently preserve and protect current and future habitat for native plants. We modeled vulnerability by creating an expert system – a network model linking biological...
Abstract (from http://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-15-0088.1): A comprehensive understanding of the spatial, seasonal, and diurnal patterns in cloud cover frequency over the Hawaiian Islands was developed using high-resolution image data from the National Aeronautics and Space Administration’s Moderate Resolution Imaging Spectroradiometer (MODIS) sensors aboard the Terra and Aqua satellites. The Terra and Aqua MODIS cloud mask products, which provide the confidence that a given 1-km pixel is unobstructed by cloud, were obtained for the entire MODIS time series (10-plus years) over the main Hawaiian Islands. Monthly statistics were generated from the daily cloud mask data, including mean cloud cover...
Categories: Publication;
Types: Citation;
Tags: Cloud Cover,
Other Water,
Pacific Islands CASC,
Plants,
Remote Sensing,
Categories: Publication;
Types: Citation
Abstract (from http://climatechangeresponses.biomedcentral.com/articles/10.1186/s40665-016-0015-2): Background Detailed assessments of species responses to climate change are uncommon, owing to the limited nature of most ecological and local climate data sets. Exceptions, such as the case of the Haleakalā silversword, can provide important insights into the complexity of biological responses to changing climate conditions. We present a time series of decadal population censuses, combined with a pair of early population projections, which together span the past 80 years of demographic history for this alpine plant. Results The time series suggests a strong population recovery from the 1930s through the 1980s, likely...
Categories: Publication;
Types: Citation;
Tags: Climate Change,
Haleakalā silversword,
Pacific Islands CASC,
Plants,
Rainfall,
A cocktail of land-based sources of pollution threatens coral reef ecosystems, and addressing these has become a key management and policy challenge in the State of Hawaii, other US territories, and globally. In West Maui, Hawai'i, nearly one quarter of all living corals were lost between 1995 and 2008. Onsite disposal systems (OSDS) for sewage leak contaminants into drinking water sources and nearshore waters. In recognition of this risk, the Hawaii State Department of Health (DOH) is prioritizing areas for cesspool upgrades. Independently, we applied a decision analysis process to identify priority areas to address sewage pollution from OSDS in West Maui, with the objective of reducing nearshore coral reef exposure...
Categories: Publication;
Types: Citation;
Tags: Coral Reefs,
Data Visualization & Tools,
Pacific Islands CASC,
Science Tools For Managers,
Water, Coasts and Ice
Categories: Publication;
Types: Citation
The Republic of the Marshall Islands (RMI) is a nation of widely dispersed, low-lying coral atolls and islands, with over 100 square miles of land area scattered across 750,000 square miles of ocean. Average elevation for the RMI is approximately 7 feet above mean sea level, but many islands and atolls are much lower. As climate change causes sea level to rise and weather patterns to shift, the Marshall Islands are increasingly having to contend with flooding and drought that damages agriculture, homes, and infrastructure. Residents are increasingly making the difficult choice to leave their home islands in the hope of a more stable future, moving within the country to larger islands or to the United States where...
Categories: Publication;
Types: Citation;
Tags: Indigenous Peoples,
Pacific Islander Indigenous Communities,
Pacific Islands CASC
Abstract (from http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0088948): Reproduction in rare plants may be influenced and limited by a complex combination of factors. External threats such as invasive species and landscape characteristics such as isolation may impinge on both pollination and seed predation dynamics, which in turn can strongly affect reproduction. I assessed how patterns in floral visitation, seed predation, invasive ant presence, and plant isolation influenced one another and ultimately affected viable seed production in Haleakalā silverswords (Argyroxiphium sandwicense subsp. macrocephalum) of Hawai’i. Floral visitation was dominated by endemic Hylaeus bees, and patterns of visitation...
Categories: Publication;
Types: Citation;
Tags: Pacific Islands CASC,
Plants,
Plants,
Wildlife and Plants
Abstract: To design effective marine reserves and support fisheries, more information on fishing patterns and impacts for targeted species is needed, as well as better understanding of their key habitats. However, fishing impacts vary geographically and are difficult to disentangle from other factors that influence targeted fish distributions. We developed a set of fishing effort and habitat layers at high resolution and employed machine learning techniques to create regional‐scale seascape models and predictive maps of biomass and body length of targeted reef fishes for the main Hawaiian Islands. Spatial patterns of fishing effort were shown to be highly variable and seascape models indicated a low threshold beyond...
Categories: Publication;
Types: Citation;
Tags: Coral Reefs,
Data Visualization & Tools,
Pacific Islands CASC,
Science Tools For Managers,
Water, Coasts and Ice
This project sought to support, facilitate, assess and synthesize the research needs and information gaps of loko i‘a across the Hawaiian Islands to provide information for resource managers to adapt to the impacts of a changing climate. Through the process of developing a Loko I’a Needs Assessment the project achieved all of its proposed original objectives. This report represents the first comprehensive compilation of the research ideas and needs within the community of fishpond managers, landowners, and stewardship organizations to inform adaptation of fishpond practices toward their resilience, adaptation, and sustainability in the face of a changing climate. This project derived findings from notes recorded...
Categories: Publication;
Types: Citation
As the impacts and risks from climate change increase, the climate assessment landscape has expanded in scope and application, resulting in the desire for more information relevant to local decision-making. Some regions lack detailed climate projections and a body of consensus findings about sector-specific impacts, and there is a need for actionable, culturally cognizant, translated climate information suitable for integration into operations and management, budgeting, funding proposals, and domestic and international policy. The Pacific Islands Regional Climate Assessment, or PIRCA, is the subject of this decade-long case study illustrating the need, development, and benefit of creating and sustaining a nuanced,...
Categories: Publication;
Types: Citation
Almost all daily rainfall time series contain gaps in the instrumental record. Various methods can be used to fill in missing data using observations at neighboring sites (predictor stations). In this study, five computationally simple gap-filling approaches—normal ratio (NR), linear regression (LR), inverse distance weighting (ID), quantile mapping (QM), and single best estimator (BE)—are evaluated to 1) determine the optimal method for gap filling daily rainfall in Hawaii, 2) quantify the error associated with filling gaps of various size, and 3) determine the value of gap filling prior to spatial interpolation. Results show that the correlation between a target station and a predictor station is more important...
Categories: Publication;
Types: Citation
Categories: Publication;
Types: Citation
Gridded bioclimatic variables representing yearly, seasonal, and monthly means and extremes in temperature and precipitation have been widely used for ecological modeling purposes and in broader climate change impact and biogeographical studies. As a result of their utility, numerous sets of bioclimatic variables have been developed on a global scale (e.g., WorldClim) but rarely represent the finer regional scale pattern of climate in Hawai'i. Recognizing the value of having such regionally downscaled products, we integrated more detailed projections from recent climate models developed for Hawai'i with current climatological datasets to generate updated regionally defined bioclimatic variables. We derived updated...
Categories: Publication;
Types: Citation
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