Which indicator species gave ecologists an early warning the Everglades ecosystem was suffering from drastic changes caused by human impact?

Question

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The wood stork is an indicator species that relies on the Everglades ecosystem for nesting and breeding. As water levels in the Everglades have decreased due to human impact, the wood stork population has dramatically declined, providing ecologists with an early warning of ecosystem changes.

Which Indicator Species Gave Ecologists an Early Warning the Everglades