What outcome occurs when increased ambient ammonia concentration alters the concentration gradient during countercurrent exchange in fish gills?

💡 Explanation

When ambient ammonia rises, reduced concentration gradients lowers diffusion rates via Fick's Law, decreasing oxygen transfer efficiency between water and blood during countercurrent exchange in fish gills. Therefore, reduced oxygen uptake occurs, rather than enhanced secretion, ammonia excretion, or pH buffering which result from different underlying mechanisms.

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