Climate change will push bluebeard shrubs northeast but fragment their Asian heartland
Liu Y, Liang F, Liu W, Zhu M, Liu M
Climate Adaptation
Bluebeard shrubs, beloved in late-summer gardens for their blue flower spikes and drought tolerance, may colonize new regions as the climate shifts, but fragmented populations in Central Asia risk local extinction before gardeners elsewhere can benefit.
Bluebeard (Caryopteris) is a drought-tough shrub native to Asia that's widely planted for its late-season blue flowers. Researchers ran computer models to map where it can survive today versus where it might thrive decades from now under different warming scenarios. They found its range will likely push northeast into cooler, higher-elevation areas, expanding overall, but getting patchy and disconnected in places like Central Asia, where isolated populations may struggle to survive.
Key Findings
Under the highest emissions scenario (SSP585), highly suitable habitat for Caryopteris increases by 24.41% by 2090, with the habitat centroid shifting northeastward toward temperate and high-altitude zones.
UV-B radiation (28.4%), diurnal temperature range (23.0%), and precipitation seasonality (10.2%) were the top three environmental drivers of where Caryopteris can establish.
Conservation gap analysis found that a large share of projected future high-suitability habitat in East Asia and the Middle East falls outside existing protected areas, indicating significant coverage gaps.
chevron_right Technical Summary
Scientists used climate modeling to predict where Caryopteris (bluebeard shrubs) will be able to grow as global temperatures rise. Suitable habitat is projected to expand northward and upward in elevation, but fragmentation and gaps in protected areas could leave many future hotspots unguarded.
Abstract Preview
Original paper
Predicting global distribution of Caryopteris under climate change using an optimized MaxEnt model: insights into ecological adaptation and conservation.
Climate change is reshaping plant species distributions, posing challenges for drought-adapted taxa with restricted native ranges. This study employed an optimized MaxEnt ecological niche model, us...
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