The Trexler-DeAngelis model shows that placentas are most likely to evolve in environments with consistent, high levels of resource availability. An assumption imperative to the model is that placental species abort embryos in low food conditions. They also lend support to hypotheses that suggest parent-offspring conflict in utero drives the evolution of the placenta.
K E Y W O R D S :Life-history evolution, matrotrophy, parent-offspring conflict, poeciliopsis, resource partitioning, Trexler-Deangelis.
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