Q1.6. Based on the data in the table below, which of the following pairs of spec

Question

Q1.6. Based on the data in the table below, which of the following pairs of species are likely to be able to coexist based on Tilman's model of resource competition? Results of Nutrient Addition Experiments, Round Two: Species 1 Species 2 Species 3 Nutrient Input Pop Si Pop Si Pop Si Rate Baseline (1x all) 2x N 2x P 2x Si 100 240 100 5000 80 3000 50 4000 50 4000 55 120 200 242 101 4998 79 6005 49 4003 50 4002 54 122 100 240 201 4995 158 2999 48 3998 50 3998 110 100 100 239 99 9999 81 3002 49 7998 94 3995 22 150 1 and 2 2 and 3 1 and 3 All 3 pairs of species are likely to be able to coexist

Explanation / Answer

Answer: Choice 3

Reason: According to the Tilman's hypothesis for existence of species in a geographical area, the pair of species which has maximum difference for the consumption of fixed amount of resources in the area survives. This means that the two species which can co-exist will represent the pair as the one having least requirements and the other having maximum requirements. Thus, the difference is greatest for species 1 and 3 and hence they tend to co-exist.

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