Abstract
The spread of ecosystem modifying invasive plant (EMIP) species is one of the largest threats to native ecosystems in Hawaiʻi. However, differences in niche characteristics between Hawaiʻi’s isolated insular environment and the wider global distribution of these species have not been carefully examined. We used species distribution modeling (SDM) methods to assess similarities and differences in niche characteristics between global and regional scales for 17 EMIPs present in Hawaiʻi. With a clearer understanding of the global context of regional plant invasion, we combined two SDM methods to better understand the potential future regional spread: (1) a nested modeling approach to integrate global and regional invasive species distribution projections; and (2) integrating all available agency and citizen science data to minimize the effect of monitoring gaps and biases. Our results show there are multiple similarities in niche characteristics across regional and global scales for most species, such as similar sets of climatic determinants of distribution, similar responses along environmental gradients, and moderate to high niche overlap between global and regional models. However, some differences were apparent and likely due to several factors including incomplete regional spread, community assembly or diversity effects. Invaders that established earlier showed a higher degree of niche overlap and similar environmental gradient responses when comparing global and regional models. This pattern, coupled with the tendency for regionally-based projections to predict narrower distributions than global projections, indicates a potential for continued spread of several invasive species across the Hawaiian landscape. Our study has broader implications for understanding the distribution and spread of invasive species in other regions, as similar analyses and models, including a novel way to characterize environmental gradient response differences across regions or scales, can likely provide valuable information for conservation and management efforts.
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Acknowledgements
We appreciate local data contributions provided by the Hawaiʻi Invasive Species Council (HISC), including the local Invasive Species Committees (ISCs) from Hawaiʻi Island, Maui County, Oʻahu, and Kauaʻi, the Koʻolau Mountains Watershed Partnership (KMWP), the Oahu Army Natural Resources Program (OANRP), and the U.S. National Park Service (NPS). We are grateful for Helen Sofaer and the anonymous journal reviewers who provided helpful feedback on the manuscript. Lastly, we thank K. Facenda for all his work on the iNaturalist records for Hawaiʻi. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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Funding for this research was provided by the USGS invasive species program.
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Berio Fortini, L., Kaiser, L.R., Daehler, C.C. et al. Exploring and integrating differences in niche characteristics across regional and global scales to better understand plant invasions in Hawaiʻi. Biol Invasions (2024). https://doi.org/10.1007/s10530-024-03284-8
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DOI: https://doi.org/10.1007/s10530-024-03284-8