Southwestern Germany loses 20% native plant species in four decades

Biodiversity hotspots in southwestern Germany are losing species richness, a new analysis shows, based on five decades of plant observations collected by a citizen‑science project. The study, led by the Stuttgart State Museum of Natural History, compared historic and recent data and found a marked decline in the number of native plant species across the region’s most diverse habitats.

The decline comes as climate change and shifting land use reshape the area’s ecosystems. Warmer temperatures are moving species northward, while intensified agriculture and urban expansion fragment natural spaces. Researchers say these pressures are converging to erode the delicate balance that once supported a rich tapestry of flora. Long‑term monitoring is essential to capture such trends, and the Floristic Mapping of Baden‑Württemberg project has become a key source of that information.

The mapping effort amassed more than 2.5 million plant observations between the 1970s and today. Analysts used the dataset to track changes in species distribution and abundance. They report that several characteristic meadow and forest species have dropped out of the records entirely, while others have retreated to higher elevations. In some hotspots, species counts have fallen by as much as 20 percent compared with the baseline recorded in the early 1980s. The findings echo similar patterns observed across Central Europe, suggesting a broader regional shift.

Scientists say the results underscore the urgency of protecting remaining habitats and restoring degraded ones. Conservation groups are calling for tighter land‑use planning and increased support for citizen‑science initiatives that can fill data gaps. The museum plans to expand the mapping program, adding more volunteers and integrating remote‑sensing tools to monitor changes in real time. If policymakers act now, the trend could be halted, preserving the region’s botanical heritage for future generations.