Shedding light on the diversity of epiphytic mosses in some Mexican forests

Background: Epiphytic mosses are one of the most common groups in forest environments but among the most neglected by researchers in Mexico. Questions: What is the epiphytic mosses diversity, measured in richness, turnover, and community composition in Mexican forests? Species of study: Epiphytic mosses. Study site and years: Humid mountain forest, pine-oak and tropical evergreen forests. Study period: 2015 to 2021. Methods: Through a literature review and field work we compiled data on epiphytic mosses in three forest types in Mexico. We assessed the data using alpha and beta diversity analysis, indicator species, and community composition. Additionally, we explored the influence of elevation and forest type on the observed diversity patterns. Results: We report a richness of 147 species of epiphytic mosses across three types of Mexican forests. The humid mountain forest was the best sampled forest with the highest moss species richness. Although species richness is different for the forests studied, species turnover is similar among them. We demonstrated that elevation and forest type are highly correlated with species richness of epiphytic mosses. Conclusions: The epiphytic mosses studied here collectively represent over 15 % of the moss richness of Mexico. Forest type and elevation seem to be the drivers of this widely distributed richness. Finally, we call for more in-depth studies of the forests presented here, as well as those in other latitudes including variables such as humidity and host traits, to provide a more complete picture of an overlooked Mexican flora.