Where does Hubbell’s ‘species generator’ come from?

On page 289 onwards, Hubbell (2001) gives an algorithm for sequentially sampling individuals from the neutral metacommunity and obtaining their species identities. The algorithm makes use of a quantity he calls the ‘species generator’ \[ \frac{\theta}{\theta + j – 1} \] where \( \theta \) is the “fundamental biodiversity number” and \( j \) is the index of the individual drawn (1st, 2nd, …). In … Continue reading Where does Hubbell’s ‘species generator’ come from?

Transient dynamics in neutral models

In their 10-year-anniversary review of neutral theory (Hubbell, 2001), Rosindell et al. (2011) note that little work has been done on the model’s transient dynamics. Transient dynamics are nonetheless interesting because they can capture important processes occurring in recently disturbed landscapes. For example, if forest is cleared such that only a small patch remains, then the number of species in that patch will continue to … Continue reading Transient dynamics in neutral models