Why does the endemic nature of the Xingu River Ray increase its vulnerability?

Answer

Any significant environmental disturbance in the Xingu basin affects the entire population

The ray's endemic status—being found only in the Xingu River system—is inextricably linked to its conservation risk. Because the entire global population resides within this single, geographically isolated ecosystem, any severe environmental stressor, such as pollution or habitat degradation within that basin, has the potential to impact every single member of the species simultaneously. This lack of alternate populations means there is no natural safeguard against localized catastrophic events.

Why does the endemic nature of the Xingu River Ray increase its vulnerability?
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