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As the impacts of global climate change on species are increasingly evident, there is a clear need to adapt conservation efforts worldwide. Species vulnerability assessments (VAs) are increasingly used to summarize all relevant information to determine a species’ potential vulnerability to climate change and are frequently the first step in informing climate adaptation efforts. VAs commonly integrate multiple sources of information by utilizing a framework that distinguishes factors relevant to species exposure, sensitivity, and adaptive capacity. However, this framework was originally developed for human systems, and its use to evaluate species vulnerability has serious practical and theoretical limitations. By...
For many species the threats of climate change occur in a context of multiple existing threats. Given the current focus of global change ecology in identifying and understanding species vulnerable to climate change, we performed a global analysis to characterize the multi-threat context for species threatened by climate change. Utilizing 30,053 species from the International Union for Conservation of Nature’s (IUCN) Red List of Threatened Species, we sought to evaluate if species threatened by climate change are more likely threatened by a greater number of non-climatic threats than species not threatened by climate change. Our results show that species threatened by climate change are generally impacted by 21%...
· Anticipating potential shifts in plant communities has been a major challenge in climate-change ecology. In the State of Hawaii, where conservation efforts tend to be habitat focused, the lack of projections of vegetation shifts under future climate is a major knowledge gap for developing management actions for climate-change mitigation and adaptation.· As a first approximation, we have modeled potential shifts of terrestrial vegetation across the Hawaiian landscape between now and the end of this century. Our approach relies on modeling the relation between current climate and the distribution of broad climatically determined moisture zones (MZs; for example, wet, mesic, and dry areas) that form the...
The datasets used in the the research project entitled, “Facilitating Adaptation in Montane Plants to Changing Precipitation along an Elevation Gradient,” are presented. One dataset includes survival of individual seedlings after 20 weeks, along with the seedling location and associated summarized temperature and soil moisture values. Another dataset includes growth over time of individual seedlings, along with the seedling location and associated summarized temperature and soil moisture values. All weather data (temperature, soil moisture, and relative humidity summary statistics) considered for the analyses are provided in another file. Seed collection data, including locations and dates of each plant species...
Summary Conduct an objective assessment of the existing programs monitoring climate-sensitive ecological variables (biological and geophysical) in the terrestrial Hawaiian environment, generate a summary for consideration at an expert workshop, participate in the workshop, and summarize the consensus recommendations reached at the workshop.
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One of the greatest ecological, social and economic issues of the day is the problem of climate change. Increasing levels of carbon dioxide (CO2) in the atmosphere are increasing global temperatures. Much of the CO2 dissolves in the ocean, creating more acidic conditions and leading to a process known as ocean acidification (OA). Higher temperatures and increased levels of CO2 operating independently are known to be detrimental to corals, but little is known about their effect when operating in unison. Irradiance has a great influence on coral calcification rates and can interact with higher temperature and increased OA to an unknown extent. Therefore, experiments were performed in continuous flow mesocosms under...
A landscape-based assessment of climate change vulnerability for native Hawaiian plants Final report
Categories: Data; Tags: LCC Science Catalog, Report, completed
Future projections of temperature change scenarios Downscaling of Temperature Changes for the Hawaiian Islands using CMIP5 Model Scenarios (delta-t)The goal of this downscaling project was to develop an ensemble of future temperature change maps for the main Hawaiian Islands. At the time of this study, we did not have a sufficient number of station-based temperature data to achieve a good representation of the spatial structure of observed temperature variability and trends. Thus it was difficult apply traditional statistical downscaling methods for the purpose of filling in detailed spatial information for future temperature change scenarios. Instead of using the observation-based statistical downscaling this...
Montane plant communities throughout the world have responded to changes in precipitation and temperature regimes by shifting ranges upward in elevation. Continued warmer, drier climate conditions have been documented and are projected to increase in high-elevation areas in Hawai‘i, consistent with climate change effects reported in other environments throughout the world. Organisms that cannot disperse or adapt biologically to projected climate scenarios in situ may decrease in distributional range and abundance over time. Restoration efforts will need to accommodate future climate change and account for the interactive effects of existing invasive species to ensure long-term persistence. As part of a larger, ongoing...
Recent studies show that past and ongoing environmental changes have been substantial and have likely already affected conservation efforts in Hawaii. Much of the state has experienced substantial drying, including decreases in mean annual precipitation since the 1920s, longer rainless periods, and decreasing stream flow. Temperatures have been increasing in the state for the last 40 years, especially at higher elevations where most native habitats and species currently persist. Unfortunately there are few long term monitoring efforts that allow us to understand plant species responses to these past, ongoing and future shifts in environmental conditions. Consequently, we know little about how environmental shifts...
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We analyzed the chemical composition of wood produced by Māmane, a tropical tree growing in Hawai’i, in order to reconstruct changes in climate over the Hawaiian Islands. Specifically, we measured changes in the relative abundance of carbon and oxygen isotopes taken up by the trees during photosynthesis at high elevation sites on Mauna Kea. We found that these isotopes reflect the climatic conditions (precipitation and temperature) under which the trees lived, allowing us to reconstruct relative changes in climate extending back ~130 years. Our results indicate decadal-scale changes in precipitation that correlate well with large-scale atmospheric and ocean circulation patterns that dominate much of the Pacific....
Determination of carbon isotope (δ13C) values of tree-ring tissue is a well-established method to reconstruct past climate variability at annual resolution, but such records are limited in tropical latitudes due to the lack of well-defined annual growth bands. Recent work has demonstrated the potential for high-resolution, intra-ring δ13C records to help define ring boundaries in tropical environments and provide additional climate information at sub-annual resolution. Here we present a high-resolution, intra-ring carbon isotope (δ13C) record of the Hawaiian endemic species Sophora chrysophylla(also known as “māmane”) in order to assess the ability to extract seasonal climate information from these drought tolerant...
Oceanographic time series and climatologies for the Pacific Islands Regional Climate Assessment DATASETS
Final Report for Reconstructing past Hawaiian precipitation using stable carbon isotope analysis of Māmane trees
map background search result map search result map Reconstructing past Hawaiian precipitation using stable carbon isotope analysis of Māmane trees Synergistic Impacts of Global Warming and Ocean Acidification on Coral Reefs Reconstructing past Hawaiian precipitation using stable carbon isotope analysis of Māmane trees Synergistic Impacts of Global Warming and Ocean Acidification on Coral Reefs