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Science  22 Dec 2006:
Vol. 314, Issue 5807, pp. 1837a
DOI: 10.1126/science.314.5807.1837a

Reproduction and population growth are driven by the availability of resources. Boutin et al. (p. 1928) provide evidence that two species of squirrel adjust their reproductive investment to match future increases in seed production, rather than simply tracking current or past seed production. Thus, reproductive investment of seed eaters can respond to future food availability, which creates an intriguing parallel in reproductive strategies between trees and the animals that consume their seed.

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