Given what we know, we can confirm that the new age structure of the predator fish impacted biodiversity in the region given that the younger predator fish were not able to control the sea urchin population.
Therefore, given that the question tells us that after the removal of adult predator fish in the area, the population of sea urchins grew to dangerous levels and reduced the biodiversity of the area, we can confirm that this is due to the younger predator fish not being able to control the sea urchin population.
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