Allen, Jenica
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Jenica
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Jenica Allen
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Publication Open Access Regional Invasive Species & Climate Change Management Challenge: Prioritizing range-shifting invasive plants High-impact species coming to the Northeast(2020) Bradley, Bethany; Allen, Jenica; Griffin, Bridget; Laginhas, Brittany B.; Rockwell-Postel, MeiPrevention of new invasions is a cost-effective way to manage invasive species and is most effective when emerging invaders are identified and prioritized before they arrive. Climate change is projected to bring nearly 100 new invasive plants to the Northeast. However, these plants are likely to have different types of impacts, making some a higher concern than others. Here, we summarize the results of original RISCC research that identifies high priority, range-shifting invasive plants based on their potential impacts.Publication Open Access Regional Invasive Species & Climate Change Management Challenge: Do Not Sell! Ornamental invasive plants to avoid with climate change(2022) Allen, Jenica; Beaury, Evelyn M.; Mazzuchi, Julia; Nelson, Michael; O'Uhuru, Ayodelé; Bradley, BethanyClimate change is likely to bring dozens of new invasive plants to the Northeast. Despite their invasive tendencies, many of these species are sold as ornamental plants in slightly warmer climates, but are not yet a large part of nursery sales in the Northeast. By avoiding these species, we protect our native ecosystems from future invasive species impacts. We also present alternative native plants that provide similar aesthetics while also supporting biodiversity.Publication Open Access Regional Invasive Species & Climate Change Management Challenge: Gardening with climate-smart native plants in the Northeast(2020) Bradley, Bethany; Bayer, Amanda; Griffin, Bridget; Joubran, Sydni; Laginhas, Brittany B.; Munro, Lara; Talbot, Sam; Allen, Jenica; Barker-Plotkin, Audrey; Beaury, Evelyn M.; Brown-Lima, Carrie; Fusco, Emily J.; Mount, Hailey; Servais, Bailey; Morelli, Toni LynAn estimated 80% of ornamental plants for sale are non-native. This means that the average yard does a poor job of supporting native flora and fauna. By shifting our plantings towards natives, we can dramatically increase the diversity of bees, butterflies, birds and other animals. In contrast, non-native plants do not support local food webs and can become invasive. Native plants increase biodiversity and reduce risks associated with invasive species, which supports resilient ecosystems in the face of climate change.Publication Open Access Regional Invasive Species & Climate Change Management Challenge: Why Native? Benefits of planting native species in a changing climate(2018) Fusco, Emily J.; Allen, Jenica; Beaury, Evelyn M.; Jackson, Michelle R.; Laginhas, Brittany B.; Bradley, Bethany AYards host a variety of native and non-native plants. It is easy to assume all plants play a similar role in supporting wildlife, but native plants dramatically increase the diversity of bees, butterflies, birds and other native animals. Additionally, non-native plants can become invasive or support invasive pests. Native plants increase biodiversity and reduce risks associated with invasive species, which supports resilient ecosystems in the face of climate change.Publication Open Access Distribution Locations of Invasive Species (Out of the Weeds? Reduced Plant Invasion Risk with Climate Change in the Continental United States)(2016-01-01) Bradley, Bethany; Allen, JenicaThe comma-delimited data file includes the species code (see Supplemental Online Table S2 for full species names), latitude, and longitude in decimal degrees (WGS84) for the occurence points used in model fitting. Some data use agreements prohibit the publication of coordinate data and those points have been removed.Publication Open Access Species Potential Range Predictions (Out of the Weeds? Reduced Plant Invasion Risk with Climate Change in the Continental United States)(2016-01-01) Bradley, Bethany; Allen, JenicaThis PDF file contains the binary potential range prediction maps for each species in the dataset under current climate. The prediction map for each species lists the species code (see Supplemental Online Table S2 for full species names), areas predicted to be climatically suitable/unsuitable under current climate, and the occurrence points for the species. See the main publication for model fitting details.Publication Open Access Incorporating climate change into invasive species management: insights from managers(2020-01-01) Beaury, Evelyn M.; Fusco, Emily J.; Jackson, Michelle R.; Laginhas, Brittany B.; Morelli, Toni Lyn; Allen, Jenica; Pasquarella, Valerie J.; Bradley, Bethany AInvasive alien species are likely to interact with climate change, thus necessitating management that proactively addresses both global changes. However, invasive species managers’ concerns about the effects of climate change, the degree to which they incorporate climate change into their management, and what stops them from doing so remain unknown. Therefore, we surveyed natural resource managers addressing invasive species across the U.S. about their priorities, concerns, and management strategies in a changing climate. Of the 211 managers we surveyed, most were very concerned about the influence of climate change on invasive species management, but their organizations were significantly less so. Managers reported that lack of funding and personnel limited their ability to effectively manage invasive species, while lack of information limited their consideration of climate change in decision-making. Additionally, managers prioritized research that identifies range-shifting invasive species and native communities resilient to invasions and climate change. Managers also reported that this information would be most effectively communicated through conversations, research summaries, and meetings/symposia. Despite the need for more information, 65% of managers incorporate climate change into their invasive species management through strategic planning, preventative management, changing treatment and control, and increasing education and outreach. These results show the potential for incorporating climate change into management, but also highlight a clear and pressing need for more targeted research, accessible science communication, and two-way dialogue between researchers and managers focused on invasive species and climate change.Publication Open Access Disentangling the abundance–impact relationship for invasive species(2019) Bradley, Bethany A; Laginhas, Brittany B.; Whitlock, Raj; Allen, Jenica; Bates, Amanda E.; Bernatchez, Genevieve; Diez, Jeffrey M.; Early, Regan; Lenoir, Jonathan; Vilà, Montserrat; Sorte, Cascade J.B.To predict the threat of biological invasions to native species, it is critical that we understand how increasing abundance of invasive alien species (IAS) affects native populations and communities. The form of this relationship across taxa and ecosystems is unknown, but is expected to depend strongly on the trophic position of the IAS relative to the native species. Using a global metaanalysis based on 1,258 empirical studies presented in 201 scientific publications, we assessed the shape, direction, and strength of native responses to increasing invader abundance. We also tested how native responses varied with relative trophic position and for responses at the population vs. community levels. As IAS abundance increased, native populations declined nonlinearly by 20%, on average, and community metrics declined linearly by 25%. When at higher trophic levels, invaders tended to cause a strong, nonlinear decline in native populations and communities, with the greatest impacts occurring at low invader abundance. In contrast, invaders at the same trophic level tended to cause a linear decline in native populations and communities, while invaders at lower trophic levels had no consistent impacts. At the community level, increasing invader abundance had significantly larger effects on species evenness and diversity than on species richness. Our results show that native responses to invasion depend critically on invasive species’ abundance and trophic position. Further, these general abundance–impact relationships reveal how IAS impacts are likely to develop during the invasion process and when to best manage them.Publication Open Access Regional Invasive Species & Climate Change Research to Practice Paper: Climate-Smart Gardening 2.0(2025) Fertakos, Matthew; Nuhfer, Thomas; Beaury, Evelyn; Singh, Kabeera; Brincka, Matt; Birch, Suvi; Bradley, Bethany; Marschner, Caroline; Allen, JenicaGardening with native and near-native plants can help gardens and nearby ecosystems adapt to our changing climate, supporting their future biodiversity and resilience. Here, we provide updated and expanded state lists of “climate-smart” commercially available native and near-native plants that are expected to grow in the Northeast with continued climate change.Publication Open Access A synthesis of the effects of cheatgrass invasion on the US Great Basin carbon storage(2020) Nagy, R. Chelsea; Fusco, Emily J.; Balch, Jennifer K.; Finn, John T.; Mahood, Adam; Allen, Jenica; Bradley, Bethany ANon‐native, invasive Bromus tectorum (cheatgrass) is pervasive in sagebrush ecosystems in the Great Basin ecoregion of the western United States, competing with native plants and promoting more frequent fires. As a result, cheatgrass invasion likely alters carbon (C) storage in the region. Many studies have measured C pools in one or more common vegetation types: native sagebrush, invaded sagebrush and cheatgrass‐dominated (often burned) sites, but these results have yet to be synthesized. We performed a literature review to identify studies assessing the consequences of invasion on C storage in above‐ground biomass (AGB), below‐ground biomass (BGB), litter, organic soil and total soil. We identified 41 articles containing 386 unique studies and estimated C storage across pools and vegetation types. We used linear mixed models to identify the main predictors of C storage. We found consistent declines in biomass C with invasion: AGB C was 55% lower in cheatgrass (40 ± 4 g C/m2) than native sagebrush (89 ± 27 g C/m2) and BGB C was 62% lower in cheatgrass (90 ± 17 g C/m2) than native sagebrush (238 ± 60 g C/m2). In contrast, litter C was >4× higher in cheatgrass (154 ± 12 g C/m2) than native sagebrush (32 ± 12 g C/m2). Soil organic C (SOC) in the top 10 cm was significantly higher in cheatgrass than in native or invaded sagebrush. SOC below 20 cm was significantly related to the time since most recent fire and losses were observed in deep SOC in cheatgrass >5 years after a fire. There were no significant changes in total soil C across vegetation types. Synthesis and applications. Cheatgrass invasion decreases biodiversity and rangeland productivity and alters fire regimes. Our findings indicate cheatgrass invasion also results in persistent biomass carbon (C) losses that occur with sagebrush replacement. We estimate that conversion from native sagebrush to cheatgrass leads to a net reduction of C storage in biomass and litter of 76 g C/m2, or 16 Tg C across the Great Basin without management practices like native sagebrush restoration or cheatgrass removal.