Which agricultural consequence faced pre-Columbian chinampa farmers relying on nitrogen fixation in shallow lake environments given seasonal flooding?

💡 Explanation

Seasonal flooding in chinampa systems leads to eutrophication because enriched nutrient input favors algal blooms, decreasing available oxygen and suppressing nitrogen-fixing bacteria, reducing overall soil fertility. Therefore decreased soil fertility from algae blooms accurately describes a consequence rather than decreased salinity, increased runoff, or land enhancement.

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