Primate origins and the evolution of angiosperms

Area of Science:

• Primate evolution
• Paleobotany
• Coevolutionary biology

Background:

• Primate morphological traits were traditionally linked to arboreal adaptations.
• Cartmill's visual predation hypothesis suggested primates evolved from insectivores.
• Recent studies on nocturnal primates challenge the visual predation theory.

Purpose of the Study:

• To re-evaluate the primary drivers of primate morphological evolution.
• To explore the role of angiosperm diversification in primate adaptation.
• To investigate the link between plant-animal interactions and early primate diversification.

Main Methods:

• Review of existing literature on primate morphology and paleobotany.
• Analysis of paleobotanical evidence for Eocene angiosperm diversification.
• Synthesis of coevolutionary theory regarding angiosperms and early mammals/birds.

Main Results:

• Insects were likely part of early primate diets but not the sole evolutionary driver.
• Paleobotanical data indicate significant angiosperm evolution during the Eocene.
• Primates, bats, and birds emerged as key seed dispersers for angiosperms.

Conclusions:

• The diversification of angiosperms and associated resources on terminal branches provided the selective pressure for primate morphological adaptations.
• Diffuse coevolution between flowering plants and animals played a crucial role in the radiation of primates, bats, and birds.
• The Eocene rainforest environment, rich in angiosperm resources, is proposed as the key factor in shaping modern primate morphology.