Answers to Analyzing Data 16.1 Questions
1. The number of invasive species that likely caused negative effects on species richness is 11. The number of invasive species that likely caused positive effects on species richness is 1.
The number of invasive species that likely had no effect is also 1. The percentage change in species richness suggests that most invasive species had strong to intermediate negative effects on species richness. Only two invasive plants had neutral or positive effects, and these effects were weak.2. The order of the magnitude of the change in species diversity (H) did differ between the two measures, with some species having higher species richness but lower species diversity than other species. This suggests that the proportional abundance of the species within the plots (evenness), which is used along with species richness to calculate species diversity, also changed with the invasion. In some cases, evenness increased, and in others, it decreased.
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