What evolutionary adaptation allows *Hypancistrus zebra* to maintain position against strong currents?
Answer
Suction-cup-like mouth structure
The physics of living in high-velocity currents necessitates specialized anchoring mechanisms, and the *Hypancistrus zebra* possesses a direct evolutionary response in the form of its mouth. This structure functions much like a powerful suction cup, enabling the fish to cling firmly to hard surfaces such as submerged boulders and large stones, even when powerful currents are flowing over them. This ability is vital both for resting securely and for maintaining position while grazing on the available biofilm and detritus found on those surfaces, demonstrating a perfect synergy between geography and biology.
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