Following an entire forest through time
Hubbell and Foster initiated a 50-hectare forest-dynamics plot on Barro Colorado Island, Panama, in 1980. Tagging, mapping and repeatedly measuring trees made it possible to examine growth, mortality and changing composition, not simply list species. These methods subsequently spread through an international plot network.
References: [2]
The meaning of the neutral assumption
His 2001 book considers communities within a trophic level, initially treating individuals of different species as equivalent in per-capita probabilities such as birth, death and migration. Demographic stochasticity, dispersal and speciation can then generate richness and relative-abundance patterns without assigning different niches at the outset.
References: [3]
A hypothesis rather than identical species
Hubbell acknowledged in the opening chapter that complete neutrality is not a full description of reality, presenting it as a starting point for studying ecological drift. Its predictions can be compared with observations and competing explanations involving niche differences and stochastic processes.
Common methods across forests
He helped found the Center for Tropical Forest Science, which became part of ForestGEO. Standardized plots allow researchers to compare forest diversity and dynamics, test neutral and alternative theories, and investigate responses to environmental change.