Module 4 Chapter 31 Multiple choice questions 31.2

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. Red squirrels (Sciurus vulgaris) have been in decline in the UK since the introduction of the grey squirrel (Sciurus carolinensis). Which of the following statements is most consistent with the researchers' explanations for this decline?

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. Following the eruption of Mount St Helens in Washington, USA, more than 23,000 ha of forest was destroyed. Scientists studied the rate at which vegetation re-colonized the destroyed areas, and concluded that plant species richness for the years 1987–1991 were, respectively 31, 33, 35, 38, 42. During which period was there the greatest increase in species number?

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