Evolution of embryonic developmental period in the marine bird families Alcidae and Spheniscidae: roles for nutrition and predation?

BMC Evol Biol · 2010 · PMC2896374 · PMID 20546608

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highly significantp < 0.01actually significant

Of our independent variables, clutch size had the greatest (negative) influence on EDP, a result that was highly significant (p < 0.01), confirming the prediction that an arms race between siblings for early hatching should drive the evolution of shorter EDP in species with two-egg clutches relative to those with one-egg clutches [ 6 , 18 ].

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