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Although many hypotheses have been proposed to explain why some plant communities are more susceptible than others to invasion by nonnative species, results from field studies have been inconsistent and no general theory of invasibility has yet emerged. However, a theory based on fluctuating resource availability could integrate most existing hypotheses and successfully resolve many of the apparently conflicting and ambiguous results of previous studies. The suggested theory is that a plant community becomes more susceptible to invasion whenever there is an increase in the amount of unused resources.

The diversity in the range of resource-release mechanisms could partly explain the absence of consistent ecological correlates of invasibility. In particular, the theory predicts that there will be no necessary relationship between the species diversity of a plant community and its susceptibility to invasion, since near-complete exploitation can each occur in both species-rich and species-poor communities. Though Lonsdale found a positive association between species richness and invasion, this may arise from the tendency of diverse plant communities to be nutrient poor and therefore more responsive to the effects of human-caused influxes of nutrients.

It can be inferred that the author would most likely agree with which of the following assessments of the results from field studies

AMany of the results contradicted predictions of susceptibility to invasion that are based on the availability of resources unused by the community.
BIf fluctuating resource availability were taken into account, many of the apparent inconsistencies among the results could be explained.
CThe apparent inconsistencies and ambiguities in the results are caused by trying to make them fit an inadequate general theory of invasibility.
D No general theory of invasibility has emerged because none of the studies has been able to assess the degree of an invasion accurately.
EThe results tend to show a degree of susceptibility to invasion that is lower than would be expected given the prevalence in the wild of nonnative species.

B显示答案

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