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Comentario sobre "Una extinción temprana del Mioceno en tiburones pelágicos"

Gavin J P Naylor¹, Arthur de Lima², José I Castro³

¹Florida Museum of Natural History, University of Florida, Gainesville, FL, USA.

Science (New York, N.Y.)

|December 9, 2021

Resumen

Un evento de extinción del Mioceno temprano en tiburones pelágicos se reinterpreta como un cambio de rango. Los cambios actuales globales, no la extinción, explican la pérdida de diversidad de denticula de tiburón en los núcleos de aguas profundas.

Área de la Ciencia:

Paleoceanografía
Biología marina
Paleontología

Sus antecedentes:

Un estudio anterior informó una extinción temprana del Mioceno en tiburones pelágicos.
Esta conclusión se basó en la diversidad reducida de denticulas de tiburón encontradas en núcleos de sedimentos de aguas profundas.

Objetivo del estudio:

Reevaluar la interpretación de la pérdida de diversidad de las dentaduras de tiburón en los sedimentos de aguas profundas del Mioceno temprano.
Proponer una explicación alternativa para el patrón observado.

Principales métodos:

Análisis de los datos de diversidad de dentaduras de tiburón de dos núcleos de sedimentos de aguas profundas.
Interpretación de datos paleoceanográficos, específicamente la reorganización de las corrientes globales.

Principales resultados:

La disminución observada en la diversidad de dentaduras de tiburones no indica necesariamente la extinción.
Los rangos de especies cambiantes debido a las corrientes oceánicas alteradas pueden explicar el patrón.

Conclusiones:

El evento del Mioceno temprano en los tiburones pelágicos fue probablemente una rotación faunal impulsada por el cambio ambiental, no una extinción masiva.
La reorganización de las corrientes oceánicas globales jugó un papel importante en la remodelación de la distribución de tiburones pelágicos durante el Mioceno temprano.

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