A 10-million-year biogeographic holding pen primed the Great American Biotic Interchange
Por:
Tseng, ZJ, Kahn, LX, Pacheco-Castro, A, Carranza-Castañeda, O, Aranda-Gomez, JJ, Wang, Y, Chávez-Ambriz, JC, Hannold, C, McDonald, HG, Wang, XM
Publicada:
30 jul 2026
Resumen:
The movement of taxa between North and South America across the Panamanian land bridge, known as the Great American Biotic Interchange (GABI), established modern-day mammal assemblages in the Americas, heralding the decisive end of what has been called the "splendid isolation" of the South American fauna. Lacking substantive low-latitude records, previous work on this pattern relied on South American and temperate North American fossils to conclude that pulsed interchanges began about 2.8 million years ago (mya). Based on new low-latitude fossil data from M & eacute;xico, we found evidence for a prolonged, triphasic interchange. Phase 1 consisted of the initial accumulation of northern higher-latitude mammals in a Mexican "holding pen" beginning 10 mya. Dispersal began in phase 2, with a strong north-south gradient and increasing biogeographic connections (7 to 3 mya). The final phase consisted of the already well-described taxonomic pulses (from similar to 2.8 mya).
Filiaciones:
Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA
Univ Calif Berkeley, Museum Paleontol, Berkeley, CA 94720 USA
Nat Hist Museum Los Angeles Cty, Dept Vertebrate Paleontol, Los Angeles, CA 90007 USA
Stanford Univ, Dept Earth & Planetary Sci, Stanford, CA USA
Univ Autonoma Queretaro, Fac Ciencias Nat, Queretaro, Mexico
Univ Nacl Autonoma Mexico, Inst Geociencias, Queretaro, Mexico
Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32310 USA
Natl High Magnet Field Lab, Tallahassee, FL USA
US Bur Land Management, Lakewood, CO USA
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