In terrestrial ecosystems, apex predators are linked to two major trophic cascades: 1- limiting herbivores, thus promoting vegetation growth (tri-trophic cascades); 2- limiting mesopredators, thus increasing small mammal and bird abundances (mesopredator cascades). It remains unclear if apex predators can achieve high densities in agroecosystems as to be ecologically effective, and the consequences of such decreases on lower trophic levels.

This study will fill these knowledge-gaps in agroecosystems of the Argentine Chaco. Specifically, I will 1- compare the functioning of trophic cascades among forest remnants surrounded by different land-uses, and well-conserved forests; 2- assess the influence of domestic animals over trophic cascades; 3- analyse the direct influence of humans (hunting pressure and surrounding population density) over the functioning of such trophic cascades. These analyses will provide insights on the potential of forest remnants to sustain mammal-mediated ecosystem functioning, and the influence of the surrounding land-use on such potential.