Q1.7. Another set of nutrient addition experiments is conducted on two additiona

Question

Q1.7. Another set of nutrient addition experiments is conducted on two additional unknown species of phytoplankton. Results are summarized in the table below. If the two species are grown together under default (baseline) conditions, which of the following will most likely occur and why? Results of Nutrient Addition Experiments, Round Three: Species 4 Species 5 PopN P Si Pop N P Si Nutrient Input Rateizeug/(ug/U Baseline (1x all) 2x N 2x P 2x Si (ug/L) (ug/L (ug/L) size (ug/L (ug/L) (ug/) 100 4000 100 5000 80 3000 29 4000 99 799999 4998 81 6001 23 4003 200 4002 101 4995 152 3001 29 3998 100 4001 98 9999 81 2999 29 7998 Species 4 will outcompete species 5 because it stabilizes at a larger population size than species 5 Species 4 will outcompete species 5 because it has a higher R than species 5 Species 5 will outcompete species 4 because it has a higher R than species 4 Species 5 will outcompete species 4 because it has a lower R* than species 4.

Explanation / Answer

Answer: Choice 4

Explanation: According to the Tilman's hypothesis for survival of ecological species and their co-existence in a niche, the species which has lower value of *R and thus, lesser requirements for the fixed number of resources outcompetes the one which has higher value of *R and requires large number of resources. According to the information, the species 5 has lesser requirements as compared to 4 and thus less value of *R, thus will outcompete the species 4.

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