Two herbivorous fish species live together in an aquarium, grazing on phytoplankton. According to the Gause principle, one of the species will be extinct in due time, but both are thriving. What could be the possible reason

a) Sufficient phytoplanktons for both the fishes

b) Less number of fishes competing for the food

c) The evolved mechanism that promotes co-existence

d) All the Above

Answer: d) All the Above

Explanation: Gause’s principle states that two closely related species competing for the same resource cannot thrive together. Also, the inferior one would be possibly eliminated. But recent studies do not support this generalised theory. Sometimes, the reasons mentioned above can lead to co-existence between such competitor species.

Also Read: Competitive Exclusion Principle

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