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Certified Water Technologist (CWT) Practice Exam

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For species 1 in a Lotka-Volterra competition model, K1 = 100 and alpha12 = 0.5. If species 2 is held at N2 = 80, at what N1 does species 1 have zero net population growth?
Correct Answer:
60
Explanation:
Species 1 has zero growth when N1 + alpha12N2 = K1. Therefore N1 + 0.5(80) = 100, so N1 = 60.

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