Chronic disturbance alters seed dispersal traits and frugivores resources in a dry tropical forest

Chronic disturbance is a major driver of biodiversity loss in seasonally dry tropical forests (SDTFs). However, its consequences on the functional dimension of diversity, particularly dispersal traits, remain unclear. We evaluated the effects of chronic disturbance on the functional traits of woody plant community and its potential effects for frugivores. We characterized eight traits related to seed dispersal and calculated the community weighted means and functional diversities for trees and whole woody community. We used GLMs to evaluate the effects of the chronic disturbance on these functional metrics, including the abundance and diversity of fruits as resources for frugivorous group. Chronic disturbance filtered traits related to dispersal, reducing the proportion of species with fleshy and heavier fruits, and producing more seeds per fruit. Functional richness and dispersion declined with disturbance. We found a general pattern of reduction in the availability and richness of fruits. Our results suggest that the changes in species richness and abundance are not random but result from environmental filtering on traits related to dispersal costs and stress tolerance. Changes in vegetation directly affected resources availability for frugivorous group, which in the medium term can affect the woody species persistence and catalyze the woody species loss.