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Primate Origins February 1st 2011.doc

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Dax Urbszat

ANT101H5S PRIMATE ORIGINS: Rise of the Primates February 1 , 2011 Ecological Niche A species way of life considered in the context of its environment. Environment-ecology dictates species, species adapt to habitat, changes-origin of species. Adaptive Radiation Rapid diversification of an evolving population as it adapts to a variety of available niches -adapts to a multitude of available niches -populations diverse with ecological -extinction Climatic event-change In speciation glaciers-15% of earths water froze. Dropping sea levels expose continent bridges increase carniforous trees-speciation Cenezoic era=epoch, what happens in each epoch ? Beginning of the order primates ? Probably occurred 65 mil years ago in paleoscene epoch-orgin or primates. Major Periods & Epochs of Evolution of Life Paleozoic – Permian Period (280 mil ya) Permian Deposits show mammal–like reptiles – Slimmer – Flesh eaters – Reduction in bones – Shifting limbs – Beginning of separation between mouth & nasal cavity – Dental differentiation permain deposists mammals-reduction of body appendix-move to side differentiation in dentition-mammal like reptiles Mezozoic (Triassic, Jurassic, Cretaceous periods) Reptiles prominent land vertebrates (dinosaurs) st 1 mammals appeared: end of triassic period (190 mil ya) – Small flesh eaters (insects) – Nocturnal (active at night) enhanced smell & hearing – Enlarged cerebral cortex – Loss of color vision CENOZOIC (Age of Mammals) (including 1 appearance of Primates) Associated with Large Climatic change – Separation of continents away from equator – Cooler temperatures - tropical & subtropical forests – Dinosaur extinction – Changing ecological niche – Radiation of new varieties of plants – Proliferation of deciduous forests – Mammalian adaptive radiation – adaptive radiation of mammals -eco niches open up dinosaurs go extinct, global climate change temperature decreased. Seperation of continents (continental drift) – tropical--->deciduous/subtropical form -new niches for mammals to exploit. Before-high energy requirement-hard to have a proper diet. Increased decidious -diversification PALEOCENE PRIMATES (65 mya) Suborder: Plesiadapiformes – Extinct mammal – common ancestry with primates – Squirrel like Insectivore – Flexible digits,wrists,ankles 1 primate (60mya) Fossil evidence: Morocco – Dentition similar to modern mouse lemur (strepsirhine) 1 primate-gliding squirrels-small,aboreal,clingers,mobile wrist, ankle joints, insectivores. Eocene Primates (55-34 mya) Age of the Prosimians (lemur, loris,tarsier) Primate characteristics: – Complete postorbital bar – Larger frontal lobe – Nails – Forward placed eyes – Slightly reduced snout – Limbs for gra
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