Beta diversity of freshwater algal communities: influence of different dispersal mechanisms

This study investigates the impact of different dispersal vectors, such as amphibians and Odonata, on the temporal beta diversity of freshwater algae in a 33-day field experiment conducted in 2018. Four treatments were employed, including a control group, exclusive amphibian dispersal, exclusive Odonata dispersal, and a mixed dispersal group. In total, we identified 76 algal species, each influenced by specific dispersal patterns associated with these vectors. The experiment initially revealed an increase in species richness and abundance; however, as the study progressed, a decrease in the rates of new species incorporation was observed, possibly indicating community establishment. Additionally, competitive dynamics emerged among algal species, leading to a reduction in temporal beta diversity over time. In summary, as communities mature and achieve stability, beta diversity decreases, especially when multiple dispersal agents are involved. Biological vectors, such as animals, significantly influence temporal beta diversity, but over time, local factors gain progressively more influence.