Inverse density dependence means:
Inverse density dependence, or positive density dependence, means performance improves as density increases over the relevant range. One expression is mortality declining with density, perhaps because groups dilute predation risk or defend themselves cooperatively. Birth rate increasing with density can also express the same general phenomenon, so the keyed mortality statement is an example rather than a complete definition. Population regulation concerns feedback, not mere limitation. A drought may sharply reduce numbers yet fail to push the population toward a repeatable equilibrium. Competi
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 5