NBB 201 – 2nd Day

NBB 201 – 2nd Day - 05:23 Most common...

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INTRODUCTION TO PRIMATES 05:23 1/26/2012 Most common variety of speciation: Allopatric Speciation SYMPATRIC SPECIATION: Example: Cyclid fish in South America some spent time on surface of lake and others spent time on bottom of lake…eventually species split into 2 different species Hybrids that are produced by 2 different species are less viable/successful than offspring of the same species ultimately, keeps the species isolated INTRODUCTION TO PRIMATES PRIMATOLOGY Why study primates? Closest living relatives: share many characteristics with humans and give us insight about human evolution: Evolutionary history, anatomy, behavior, life-history patterns, physiology and cognition Darwin understood that we should compare humans with primates HOMOLOGY: similarity based on common ancestry used to assign organisms to the same taxon Have common evolutionary origin If we see similarities in primates under the same environmental circumstances, its because we share the common history ANALOGY: similarities based on convergent evolution independently evolved to serve a similar function In terms of adaptations to habitats, living apes don’t live where early humans originated, but some monkeys do—so we might study their behavior instead (like studying dolphins and sharks) Bodies adapted for similar functions: size, body shape, fins, tails, oceanic Primates = ORDER
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Prosimians: originated first, and from which all other primates evolved; lower primates Anthropoids: higher primates New world monkeys: central/south America (and tip of north America) Separated from old world monkeys ~25MYA Have tails PRIMATE EVOLUTION When the dinosaurs went extinct (65MYA) --- mammals were able to flourish, especially the primates At some point, (btw 55-45 MYA), an anthropoid appears Primate phylogeny: many similarities based on common ancestry Carpolestes: lived 56MYA, late Paleocene; possessed some characteristics of modern primates (but not all)—big eyes, grasping hands Darwinius: 47 MYA; complete skeleton with fossilized fur and trace amounts of food in skeleton
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Evolution outline is being filled/changed constantly (this was found in 2009) Aegytopithecus: fayum deposits in Egypt; ~34MYA (Oligocene); anthropoid traits, including
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NBB 201 – 2nd Day - 05:23 Most common...

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