What environmental parameters define the native habitat of *H. zebra* in the middle Xingu?
Answer
Fast-flowing, highly oxygenated water over rocky substrates
The evolutionary success of *H. zebra* is tied to its highly specialized niche within the middle section of the Xingu River. This environment is characterized by dynamic, high-energy aquatic conditions, specifically featuring water that is moving rapidly and is highly saturated with dissolved oxygen. Furthermore, the fish inhabits areas where the riverbed consists of rocky substrates, which shapes the development of its physical features necessary for clinging and camouflage in such conditions.
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