For gap phase dynamics to contribute to species diversity, one must assume that there are differences in resources (light, nutrients, etc.) associated with different parts of the gap (i.e. gap edge or
centre), and that different species are adapted to these differences. Such a pattern is referred to as "gap partitioning".
Larger gaps are expected to contain greater resource heterogeneity than smaller gaps, and thus should show higher diversity of regenerating trees. This hypothesis was recently tested by Stephen Hubbell and co-workers using data from a 50-ha mapped forest plot on Barro Colorado Island in Panama. Although gap sites were found to have greater species diversity of saplings, this was due entirely to higher stem density in the gap sites. The number of species encountered per stem did not differ between gap and nongap sites. Thus, recent evidence suggests that gap phase dynamics may not be the major mechanism for maintaining diversity in tropical forests. There is, however, clear evidence for important niche differences in tropical trees related to soil types and forest hydrology.
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