Here, Jon Keeley and his colleagues document an example of immaturity risk for population decline in knobcone pine (Pinus attenuate), a rare, serotinous, obligate-seeding pine species.
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Keeley, J. E., G. Ne’eman and C.J. Fotheringham. 1999. Immaturity risk in a fire-dependent pine. Journal of Mediterranean Ecology 1:41-48.