Biodiversity loss can make ecosystems less resistant to drought. By studying plant communities with different numbers of species and evenness levels, researchers found that having more even species distribution increases community drought resistance. Communities with higher species richness are more resistant to drought, especially when species are evenly distributed. This is because diverse communities with even species distribution work better together, making them more resilient to drought. Both species richness and evenness are important for predicting how well plant communities can handle future droughts.