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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“It is easy and dismally enervating to think of opposition as merely perverse or actually evil—far more invigorating to see it as essential for honing the mind, and as a positive good in itself. For the day that moral issues cease to be fought over is the day the word “human” disappears from the race.”
—Jill Tweedie (b. 1936)
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