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Cuantificación de la biodiversidad global de los eucariotas del Proterozoico

Qing Tang1,2,3, Wentao Zheng4, Shuhan Zhang1

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Se cuantifica la diversidad de fósiles de eucariotas del Proterozoico, revelando las glaciaciones criogénicas como una división evolutiva clave. Este período separa el estancamiento prolongado del Ediacaran

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Área de la Ciencia:

  • Paleontología
  • La macroevolución
  • Escalas de tiempo geológicas

Sus antecedentes:

  • La cuantificación de la diversidad de fósiles de eucariotas del Proterozoico es crucial para comprender los patrones macroevolutivos tempranos de la Tierra.
  • Las evaluaciones anteriores de la diversidad de la vida temprana son limitadas, lo que dificulta un análisis exhaustivo.

Objetivo del estudio:

  • Construir una evaluación cuantitativa de la diversidad de los eucariotas fósiles desde el Paleoproterozoico hasta el Cámbrico temprano.
  • Identificar los principales cambios evolutivos y su correlación con los eventos geológicos.

Principales métodos:

  • Compilación completa de los datos de los eucariotas fósiles.
  • Análisis cuantitativos para generar una curva de riqueza taxonómica.
  • Correlación de los patrones de diversidad con los eventos paleoclimáticos, específicamente las glaciaciones criogénicas.

Principales resultados:

  • Se generó una nueva curva de riqueza taxonómica para los eucariotas fósiles desde el Paleoproterozoico hasta el Cámbrico temprano.
  • Las glaciaciones criogénicas fueron identificadas como una división evolutiva significativa.
  • El
  • Un billón aburrido
  • Durante este período, se observó una estanqueidad evolutiva prolongada.
  • El período Ediacaran exhibió una mayor diversidad, una rápida rotación y múltiples radiaciones y extinciones.

Conclusiones:

  • El Eón Proterozoico experimentó distintas fases evolutivas separadas por las principales glaciaciones.
  • Estos hallazgos proporcionan un marco para probar hipótesis sobre la coevolución de la biosfera y la geosfera.
  • El estudio pone de relieve la naturaleza dinámica de la evolución temprana de los eucariotas.