Is Invariance Across Animal Species Just an Illusion?

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Science  19 Aug 2005:
Vol. 309, Issue 5738, pp. 1193-1195
DOI: 10.1126/science.1117591

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Life history invariants (dimensionless ratios between two life history variables) have been proposed as a major similarity over organisms. In a Perspective, de Jong discusses how the method to detect life history invariants is statistically flawed, as reported in the same issue by Nee et al. Therefore, life histories might require different explanations for different species, rather than being ordered to similar principles.