Cambios de la biodiversidad en la historia de la tierra. Eventos de extinción
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2020-10-14
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Jaén: Universidad de Jaén
Resumen
Para abordar el estudio de los eventos geológicos de carácter físico, químico o biológico hay que hacerlo desde una perspectiva neocatastrofista, admitiendo la existencia de procesos graduales, lentos, y de otros catastróficos (eventos) rápidos. Las extinciones en masa son eventos biológicos que han acontecido en diferentes momentos de la Historia de la Tierra y que han supuesto reducciones importantes de la biodiversidad del momento. Estos eventos son el resultado de la interacción de diferentes procesos geológicos que inducen cambios físicos y químicos importantes en el sistema océano-atmósfera. De entre todos los eventos de extinción en masa, hay cinco que han supuesto reducciones especialmente importantes de la biodiversidad (Ordovícico Superior, Devónico Superior, Pérmico Superior, Triásico Superior y Cretácico Superior). Además, recientemente se contempla la posibilidad de una sexta extinción (Holoceno Superior), que estaría relacionada con la actividad antrópica.
To study geological events from several standpoint (physical, chemical or biological nature), it must be done under neo-catastrophism conception, considering the existence of gradual and slow processes and other fast and catastrophic processes (events). Mass extinctions are biological events that have occurred at different times in Earth's History. They have led to significant reductions in the biodiversity of the moment. These events are consequence of the interaction of several geological processes that induce important physical and chemical changes in the ocean-atmosphere system. Between the whole mass extinction events, five have led to the largest reductions in biodiversity (Upper Ordovician, Upper Devonian, Upper Permian, Upper Triassic, and Upper Cretaceous). Recently, the possibility of a sixth extinction (Upper Holocene) was considered, which would be related to human activity
To study geological events from several standpoint (physical, chemical or biological nature), it must be done under neo-catastrophism conception, considering the existence of gradual and slow processes and other fast and catastrophic processes (events). Mass extinctions are biological events that have occurred at different times in Earth's History. They have led to significant reductions in the biodiversity of the moment. These events are consequence of the interaction of several geological processes that induce important physical and chemical changes in the ocean-atmosphere system. Between the whole mass extinction events, five have led to the largest reductions in biodiversity (Upper Ordovician, Upper Devonian, Upper Permian, Upper Triassic, and Upper Cretaceous). Recently, the possibility of a sixth extinction (Upper Holocene) was considered, which would be related to human activity