No evidence for niche competition in the extinction of the South American saber-tooth species.

ABSTRACT: The end of South American isolation during the Great American Biotic Interchange (GABI) promoted the contact between South and North American saber-tooth forms that evolved in isolation. This contact may have driven saber-tooth species to a competitive interaction, resulting in the extinction of the South American saber-tooth form. Here, we used paleoclimatic data to compare the climatic niche of the saber-tooth forms Thylacosmilus atrox (from South America), Smilodon fatalis, and Smilodon populator (both originally from North America). We evaluated niche width, overlap, and similarity to infer potential geographic distribution overlap and competition between these North and South American predators. To do so, we obtained the climatic variables from sites where occurrence fossil records we

SUBMITTER: Freitas-Oliveira R 

PROVIDER: S-EPMC11332042 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature