Before the Permian mass extinction event, both complex and simple marine ecosystems were equally common; after the recovery from the mass extinction, the complex communities outnumbered the simple communities by nearly three to one, and the increase in predation pressure led to the Mesozoic Marine Revolution.
Antes do evento de extinción en masa do Permiano, os ecosistemas mariños simples e complexos eran igual de comúns; despois da recuperación da extinción, as comunidades complexas superaron en número ás simples nunha proporción de case tres a un, e o incremento da presión de predación levou á Revolución mariña do Mesozoico.