Positive density-dependence, density-dependent facilitation, or the Allee effect describes a situation in which population growth is facilitated by decreased population density.
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Famous quotes containing the word positive:
“The oaks, how subtle and marine!
Bearded, and all the layered light
Above them swims; and thus the scene,
Recessed, awaits the positive night.”
—Robert Penn Warren (1905–1989)