Consider Two Interacting Beetle Species in an Environment Which Switches

question 72

Multiple Choice

Consider two interacting beetle species in an environment which switches between one of two states: state 1, in which species 1 outcompetes species 2; and state 2, in which species 2 outcompetes species 1. The time spent in either state, as well as the degree to which one species outcompetes the other, is roughly the same. Thus, on average, species 1 and 2 are comparable in their competitive abilities. According to Hutchinson's model of coexistence, in which of the scenarios is competitive exclusion most likely to occur?

• A) When environments switch every four days on average and competitive exclusion usually takes five days
• B) When environments switch every four days on average and competitive exclusion usually takes four weeks
• C) When environments switch every four weeks on average and competitive exclusion usually takes five weeks
• D) When environments switch every five weeks on average and competitive exclusion usually takes four weeks

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