Abstract
We describe the floristic composition of Hawaiian dry forest trees and identify natural history characteristics and biogeographic variables that are associated with risk of endangerment. Hawaiian dry forests are comprised of 109 tree species in 29 families, with 90% of all species endemic, 10% indigenous, and 37% single-island endemics. Forty-five percent of Hawaiian dry forest taxa are at risk of endangerment. Dry forest taxa at risk have a significantly larger range size compared to taxa from other Hawaiian forest types. Dispersal mechanism was a significant predictor of a species occurrence in dry forest compared to other forest types based on logistic regressions clustered by lineage. Among dry forest taxa, hermaphroditic breeding systems, autochorous dispersal mechanisms, conspicuous flowers, and dry fruit were all more likely to be at risk of endangerment. When analyses were clustered by lineage using logistic regressions, only dispersal mechanism and flower size were significant predictors of risk and taxa with autochorous dispersal and conspicuous flowers were more likely to be at risk. The Big Island, Maui, Oahu, and Kauai all have remarkably similar numbers of dry forest taxa (63–65 species) and dry forest taxa at risk of endangerment. However, Big Island and Kauai have the highest number and percentage of single-island endemics. These results demonstrate patterns of endangerment specific to Hawaiian dry forests, the high levels of endangerment in this forest type, and the importance of prioritizing conservation in dry forest regions.
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Acknowledgements
We thank the federal and state agencies and particularly the Nature Conservancy Hawaii for granting us permission to do research in the Hawaiian Islands. We also thank Kapua Kawelo and Dan Sailer for transportation and technical support on Oahu. We thank Clyde Imada and Napua Harbottle at the Bishop Museum for permissions to examine herbarium specimens. For assistance with field surveys we thank Elizabeth Del Cid, Jo Sito, Scott Pipken, Markie Daniel, Robert Gillespie, Kathy Gillespie, Glen MacDonald, Irem Sepil, and John May. Finally, we thank an anonymous reviewer for valuable comments and suggestions on an earlier version of this manuscript. This research was funded by the National Geographic Society, National Science Foundation BCS0455052, Undergraduate Research Fellowship, UCLA Department of Geography, UCLA Stephen A. Varva Fellowship, and NASA Earth System Science Fellowship.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s10531-009-9704-5
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Pau, S., Gillespie, T.W. & Price, J.P. Natural history, biogeography, and endangerment of Hawaiian dry forest trees. Biodivers Conserv 18, 3167–3182 (2009). https://doi.org/10.1007/s10531-009-9635-1
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DOI: https://doi.org/10.1007/s10531-009-9635-1