Communities studied in the Santa Catalina Mountains were resampled after 50 years in order to study the impacts of recent climate warming on patterns of community structure. Which of the following statements regarding this study is FALSE?

A. The observed changes in the patterns of zonation in the Santa Catalina Mountains are a result of whole communities shifting their elevation ranges in response to regional changes in climate.
B. Plant communities were reorganized based on the range shifts of individual species.
C. The researchers discovered that the majority of species had shifted their ranges upslope.
D. The researchers discovered that those plants that did not shift their ranges now grow in a narrower elevation range than what was noted in the previous study.
E. The species compositions of the plant communities along the elevation gradient have changed significantly.