INECOA   26036
INSTITUTO DE ECORREGIONES ANDINAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Cenozoic evolution of Western Amazonian ecosystems
Autor/es:
ANTOINE, PIERRE-OLIVIER; BOIVIN, MYRIAM; NAVARRETE, ROSA E.; RODDAZ, MARTIN; BABY, PATRICE; JARAMILLO, CARLOS; PARRA, FRANCISCO; TEJADA-LARA, JULIA V.; BENITES-PALOMINO, ALDO; MARIVAUX, LAURENT; PUJOS, FRANÇOIS; SALAS-GISMONDI, RODOLFO
Lugar:
Toulouse
Reunión:
Congreso; 8th HYBAM scientific meeting; 2019
Resumen:
<!-- /* Style Definitions */p.MsoNormal, li.MsoNormal, div.MsoNormal{mso-style-parent:"";margin:0cm;margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman";}@page Section1{size:612.0pt 792.0pt;margin:70.85pt 70.85pt 70.85pt 70.85pt;mso-header-margin:36.0pt;mso-footer-margin:36.0pt;mso-paper-source:0;}div.Section1{page:Section1;}-->We providea synopsis of ~65 million years of life history in Neotropical lowlands, basedon a comprehensive paleontological survey of Cenozoic deposits from PeruvianAmazonia, with more than 150 fossil-bearing localities identified by our team since2003. These localities have yielded a diversity of fossil remains, includingvertebrates, mollusks, arthropods, plant fossils, microremains, and microorganisms,ranging from the early Paleocene up to the Pleistocene. This Cenozoic series revealsthe alternation of marine-influenced episodes (Paleocene; middle Eocene; lateEocene; Miocene, with three successive pulses) and freshwater-terrestrial environments(lacustrine, fluvial, floodplain, and terra firme). More particularly, paleoenvironmentalproxies point to the presence of tropical rainforests in Amazonia throughoutthe documented interval, even if a drier episode is documented in the earlyOligocene period. Western Amazonia experienced a much longer marine-influencedperiod during the Miocene, with the ?long-lived Pebas megawetland system?.Together with the Andean uplift, this Pebas system played a pivotal role in thebiotic differentiation of southern/northern South American ecosystems andcorresponding mammalian guilds prior to the Great American Interchange(s). Toour knowledge, no direct evidence of any North American terrestrial mammalian immigrantshas yet been recognized in the Miocene record of Western Amazonia. Moregenerally, the fossil assemblages from Peruvian Amazonia attest at least tofour biogeographic histories inherited from (i) Mesozoic Gondwanantimes, (ii) the Panamerican realm prior to (iii) the time ofSouth America?s Cenozoic ?splendid isolation?, and (iv) Neotropicalecosystems in the Americas.