Community herbivory in tropical montane rainforests is affected by phylogenetic plant diversity, specific leaf area, and leaf nutrient concentrations

This is a Preprint and has not been peer reviewed. This is version 2 of this Preprint. You must log in to post a comment. There are no comments or no comments have been made public for this article. This is a Preprint and has not been peer reviewed. This is version 2 of this Preprint. Add a Comment You must log in to post a comment. Comments There are no comments or no comments have been made public for this article. Arthropod herbivores modulate ecosystem structure, productivity, and nutrient cycling. While previous work has shown that plant-herbivore interactions for individual species are shaped by abiotic factors, traits, and the surrounding plant community, the relative contribution of abiotic and biotic factors for herbivory at the community level remains elusive. Here, we use a structural equation model to disentangle the relative impact of temperature, precipitation (i.e., abiotic factors), tree phylogenetic diversity, and chemical as well as morphological leaf traits on total leaf herbivory in the tree canopy. Leaf area loss was estimated along an elevational gradient from 1000 to 3000 m a.s.l. in a tropical rainforest in southern Ecuador using litter traps. Community leaf herbivory ranged from 2.5 % at 3000 m to 3.4 % at 1000 m. Community leaf herbivory decreased with elevation, indirectly linked to increasing phylogenetic diversity and directly to lower specific leaf area, calcium, and iron concentrations in plants. Our results suggest that community leaf herbivory depends primarily on biotic interactions, which implies that variations in these interactions, e.g., through climate or land-use change, could cause a shift in the structure or productivity of the whole ecosystem. https://doi.org/10.32942/X2W347 Life Sciences herbivory, elevational gradient, Environmental drivers, Leaf Traits, rainforest, Arthropods, Ecuador Published: 2024-12-13 13:34 Data and Code Availability Statement: Open data/code will be available upon publication in a journal. Language: English