Latitudinal patterns in stabilizing density dependence of forest communities - Nature
Briefly

Among those patterns, the latitudinal gradient in tree species diversity is particularly notable. A central explanation for the exceptionally high local diversity in tropical moist forests is that their temporally stable and productive conditions allow natural enemies...exert more negative effects on a target tree individual than do heterospecific neighbours.
First proposed by Janzen and Connell five decades ago, CNDD mediated by specialized enemies is one key hypothesis for explaining the maintenance of greater local tree species diversity in tropical forests.
Read at Nature
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