Anthropogenic factors negatively influencing the endangered Strange-tailed Tyrant’s breeding success.

BROWNE MELANIE; CATAUDELA, J. FRANCISCO; DI GIACOMO, ALEJANDO; DI BITETTI, MARIO S.; DI GIACOMO, ADRIÁN S.

Gramado

Congreso; II Ornithological Congress of the Americas; 2023

Association of Field Ornithologists

Our results could be explained by predator-livestock conflicts, which drove top predators toextinction in Corrientes possibly triggering a mesopredator release. The lower DSR and nest density of grazing ranches could be influenced by current grazingpractices, such as annual fires and stocking rates, affecting vegetation structure and foodavailability.Rapid grassland recovery and a high population density could have allowed the Strange-tailedTyrant to breed in the subsequent season after the wildfire.Our findings are alarming considering that we found negative effects on the Strange-tailedTyrant’s breeding biology both in protected areas of high conservation value and in private landsdevoted to livestock grazing, the main form of land-use in the region.