Macroevolution of dimensionless life history metrics in tetrapods

Cecina Babich Morrow, S.K. Morgan Ernest & Drew Kerkhoff
Life history traits represent organisms’ strategies to navigate the fitness trade-offs between survival and reproduction. Eric Charnov developed three dimensionless metrics to quantify fundamental life history trade-offs. Lifetime reproductive effort (LRE), relative reproductive lifespan (RRL), and relative offspring size (ROS), together with body mass, can be used to classify life history strategies across the four major classes of tetrapods: amphibians, reptiles, mammals, and birds. First, we investigate how the metrics have evolved in concert with...
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