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Efectos del rápido calentamiento global en el límite Paleoceno-Eoceno en la vegetación neotropical
Carlos Jaramillo1, Diana Ochoa, Lineth Contreras
1Smithsonian Tropical Research Institute, Box 0843-03092, Balboa, Ancon, Republic of Panama. jaramilloc@si.edu
Science (New York, N.Y.)
|November 13, 2010
Resumen
Las selvas tropicales prosperaron durante el Máximo Térmico Paleoceno-Eoceno (PETM) a pesar de un aumento de la temperatura de 3 ° 5 ° C. Surgieron nuevas especies de plantas, lo que indica resistencia al calentamiento y altos niveles de CO2.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La paleobotánica es la paleobotánica.
- Ecología neotropical ecología neotropical.
Sus antecedentes:
- El Máximo Térmico Paleoceno-Eoceno (PETM) causó un rápido calentamiento global, con temperaturas tropicales que aumentaron en 3°5°C.
- Comprender las respuestas de los ecosistemas tropicales a los eventos de calentamiento extremo es crucial para predecir los impactos climáticos futuros.
Objetivo del estudio:
- Investigar la respuesta de los bosques tropicales al rápido calentamiento durante el PETM.
- Evaluar los cambios en la diversidad vegetal y las tasas de origen en los bosques neotropicos.
Principales métodos:
- Análisis de registros palinológicos de tres secciones estratigráficas en el este de Colombia y el oeste de Venezuela.
- Evaluación de la diversidad vegetal y las tasas de origen durante el PETM.
Principales resultados:
- Se observó un aumento significativo en la diversidad vegetal y las tasas de origen.
- Se agregaron nuevos taxones de angiospermas a la flora, lo que indica una rápida adaptación y diversificación.
- No se encontró evidencia de aumento de la aridez en el norte de los Neotrópicos.
Conclusiones:
- Los bosques lluviosos tropicales persistieron y se diversificaron durante el PETM a pesar del calentamiento significativo y los altos niveles de CO2.
- Contrariamente a algunas hipótesis, los ecosistemas tropicales demostraron resiliencia en lugar de un compromiso severo debido al estrés por calor.
- El estudio destaca la capacidad de adaptación de la flora tropical a eventos pasados de cambio climático.
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