Carps were launched into an artificial reservoir. Explain how this can affect the number of insect, crucian, and pike larvae living in it.

1. Carps feed on insect larvae – the number of larvae will decrease
2. Carps are competitors to crucian carp – can lead to increased interspecific struggle and a decrease in the number of crucian carp, or even complete crowding out (Gauze’s law of competitive exclusion)
3. Carps are food for pike, leading to an increase in the number of predators

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