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Published online by Cambridge University Press: 30 October 2001
Rendell and Whitehead state that marine ecosystems are more variablethan terrestrial ecosystems over time scales of months or longer.The marine environment is actually less variable than theterrestrial at these shorter time scales, and probably equallyvariable over centuries. This issue is important when consideringclaims that environmental variability affects benefits of sociallearning versus individual learning and genetics.