Do Reverse Janzen-Connell Effects Reduce Species Diversity?

Host-specific natural enemies limit the abundance of common species. This can increase host community diversity, since no single species dominates, and is known as the 'Janzen-Connell effect.' Evidence is now accumulating that host-specific mutualists can increase abundances of particular host species, hence reducing commu-nity diversity, comprising a 'reverse Janzen-Connell effect.'

Automated summary

Host-specific natural enemies can limit the abundance of common species, leading to increased host community diversity (referred to as the 'Janzen-Connell effect'). Conversely, host-specific mutualists may enhance the abundance of particular host species, ultimately reducing community diversity (known as the 'reverse Janzen-Connell effect').