When the warm ocean current El Niño replaces the cooler Peruvian, or Humboldt, current along the coast of Peru, the supplies of anchovies on which sea birds feed decrease. As a result, the number of sea birds roosting on the coastal islands decreases.The passage describes the effect of El Niño on Peru's?

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The passage explains how El Niño impacts the food supply (anchovies) for sea birds, leading to a decrease in their numbers. This is a direct effect on the ecosystem, involving interactions between the physical environment (ocean currents) and living organisms (anchovies and sea birds).

When the Warm Ocean Current El Niño Replaces the Cooler