The cryptic regulation of diversity by functionally complementary large tropical forest herbivores

Author(s)

Villar, Nacho ^[1] ; Siqueira, Tadeu ^[1] ; Zipparro, Valesca ^[1] ; Farah, Fabiano ^[1] ; Schmaedecke, Gabriela ^[1] ; Hortenci, Luana ^[1] ; Brocardo, Carlos Rodrigo ^[1] ; Jordano, Pedro ^[2] ; Galetti, Mauro ^{[3, 1]}

Affiliation

^[1] Univ Estadual Paulista, Inst Biociencias, Dept Ecol, UNESP, Rio Claro - Brazil

^[2] CSIC, EBD, Integrat Ecol Grp, Seville - Spain

^[3] Univ Miami, Dept Biol, Coral Gables, FL 33124 - USA

• Document type: Journal article
• Source: JOURNAL OF ECOLOGY; AUG 2019.
• Web of Science Citations: 0

Abstract

Tropical forests hold some of the world's most diverse communities of plants. Many populations of large-bodied herbivores are threatened in these systems, yet their ecological functions and contribution towards the maintenance of high levels of plant diversity are poorly known. The impact of these herbivores on plant communities through antagonistic seed and seedling predation has received much attention, whilst their relevance as seed dispersal agents has been largely overlooked in experimental studies. Here, we tested how two key and functionally distinct large generalist mammalian herbivore species (the tapir Tapirus terrestris - a solitary browser and generalist seed disperser, and the white-lipped peccary Tayassu pecari - a group-living generalist seed/seedling predator) affect spatiotemporal patterns of diversity of seedling communities in tropical forests. We conducted a long-term multi-region landscape-scale exclusion experiment across four regions of the Atlantic forest of Brazil, representing a functional gradient of defaunation where these species were either present and absent in isolation and in combination. Our results indicate that mammalian herbivores have a substantial role in regulating beta diversity in space and time. Seedling recruitment was strongly limited by the presence of the seed/seedling predator species (the peccary), but the presence of the browser and seed disperser (the tapir) had null net effects. Alpha diversity of seedlings at the community level did not respond to large herbivore exclusion at any region, whereas beta diversity decreased only where both herbivores were simultaneously excluded. Surprisingly, the synergic positive effect of both herbivore types on beta diversity was linked to increased evenness amongst dominant plant species, and a simultaneous decrease in alpha diversity of rare species. Synthesis. Together, these results challenge the common perception that large tropical forest herbivores maintain tropical forest diversity through antagonistic interactions, suggesting instead a synergistic effect of antagonistic predation and mutualistic seed dispersal on regional compositional diversity and local community assembly. We suggest that the defaunation of large-bodied herbivores with complementary functions strongly affects the structure and dynamics of plant communities through cryptic mechanisms that remain largely unexplored. (AU)

• FAPESP's process: 14/01986-0 - Ecological consequences of defaunation in the Atlantic Rainforest
• Grantee: Mauro Galetti Rodrigues
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 15/11521-7 - Defaunated movement: the role of animal behaviour and spatial interactions in mediating trophic cascades, niche partitioning and community dynamics in the Atlantic Forest
• Grantee: Jose Ignacio Fernandez de La Pradilla Villar
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/50424-1 - Scaling biodiversity in tropical and boreal streams: implications for diversity mapping and environmental assessment (ScaleBio)
• Grantee: Tadeu de Siqueira Barros
• Support Opportunities: Regular Research Grants