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Hipóxia, calentamiento global y extinciones terrestres del Pérmico tardío.
1Department of Biology, University of Washington, Box 351800, Seattle, WA 98195, USA. hueyrb@u.washington.edu
Science (New York, N.Y.)
|April 16, 2005
Resumen
La extinción del Pérmico tardío fue precedida por la degradación ambiental. El calentamiento climático simulado y los bajos niveles de oxígeno comprimieron los rangos de vertebrados terrestres, provocando extinciones y obstaculizando la recuperación del ecosistema.
Área de la Ciencia:
- Paleontología Paleontología.
- Ciencias del clima Ciencias del clima Ciencias del clima
- Ecología Ecología Ecología.
Sus antecedentes:
- La extinción de finales del Pérmico fue un evento catastrófico.
- Las altas tasas de extinción antes del evento principal sugieren un estrés ambiental previo.
Objetivo del estudio:
- Investigar el impacto de los cambios ambientales en los vertebrados terrestres durante el Pérmico Tardío.
- Para simular los efectos de la reducción de oxígeno y el calentamiento en los hábitats y la supervivencia de las especies.
Principales métodos:
- Utilizó modelos de simulación para evaluar los efectos de la caída de oxígeno atmosférico y el calentamiento climático.
- Analizó las consecuencias de los rangos altitudinales comprimidos en la diversidad de hábitats y la dinámica de la población.
Principales resultados:
- Las simulaciones indican que la disminución del oxígeno y el aumento de las temperaturas indujeron el estrés hipóxico.
- La compresión de la gama altitudinal cerca del nivel del mar redujo la disponibilidad de hábitats y las poblaciones fragmentadas.
- Estos factores probablemente contribuyeron a las extinciones a través de la pérdida de hábitat y los efectos de área de especies.
Conclusiones:
- La degradación ambiental sostenida, no sólo la catástrofe final, afectó a los vertebrados terrestres del Pérmico Tardío.
- La compresión y fragmentación del hábitat fueron los principales impulsores de la extinción.
- Estas presiones pueden haber prolongado la recuperación del ecosistema después de la extinción.
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