Anth 2 Flashcards
Taxonomy
assign and organize organisms to categories based on their relatedness or resemblance
Homology
similarities used to assign organisms to the same taxon
Analogy
common traits due to similar environmental pressures
Convergent Evolution
Two different species evolve similar traits but did not come from a common ancestor. EX: bats and birds
Primate Family Tree
Prosimians/Anthropoids New World/Old World Monkeys
Apes
Primate Tendencies
- Grasping Ability 2. Reliance on Sight over Smell
- Reliance on Hand over Nose
- Brain Complexity
- Parental Investment
- Sociality
Prosimians
Our most distantly related primate. Relatively small with a small brain. Nocturnal. Solitary
Anthropoids
Diurnal. Gregarious and more social. A larger primate than prosimians.
New World Monkeys
Prehensile tail. Arboreal (tree-dwelling). Nasal Morphology. Mainly in South America
Old World Monkeys
Terrestrial. Greater degree of sexual dimorphism. Located in Africa and South Asia.
Ape Species
Gibbons, Orangutans, Gorillas, Chimpanzees, Bonobos
Sexual Dimorphism
In Old World monkeys, there is a notable physical difference between males and females. For Apes: (chimpanzees) females are 88% the size of males. There is less difference in New World monkeys.
Orangutans
-Diet: varied diet of fruit, insects, bark, leaves -Locomotion: more arboreal and climbs trees
-Social arrangements: Males forage alone, females and young stay together, also marked sexual dimorphism
Gorillas
-Diet: vegetation rich diet in bulk -Locomotion: terrestrial (do not spend time in trees)
-Social arrangement: groups of around 20, lives in Africa, marked sexual dimorphism
Chimpanzees
-Diet: prefers fruit, omnivorous -Locomotion: lighter weight so more arboreal
-Social arrangement: smaller degree of sexual dimorphism, communities of up to 50 chimps
Similarities (between humans and apes)
- Learning2. Tool Use
- Hunting
- Symbolic Commutation
Differences (between humans and apes)
- Share Food2. Plan, Carry out complex, multistage tasks
- Spoken Language4. Classify others as kin of various types and interact w them for life
Primate Tool Use
Termite fishing by Chimpanzees
Jane Goodall’s Wild Chimpanzees
Discovered that Chimps make tools, eat and hunt for meat, and have similar social behavior to humans. Completely transformed our understanding of chimps
Bonobos
-Diet: omnivorous, like chimps-Locomotion: arboreal-Social arrangement: the community is centered around females
Hominid
Refers to the taxonomic family that includes humans and the African apes and their immediate ancestors
Hominin
refers to the human line after its split from ancestral chimps
Hogopan
hypothetical last common ancestor. the split 6-8 mya into different ecological niches and their diets became specialized
Earliest Potential Hominins
Ardi: Most complete hominid specimen
Close to 4 feet tall, 120 pounds
4.4 mya
Hominin Taxonomy
A. anamensis (4.2-3.9mya) KenyaA. afarensis (3.8-3.0) East Africa
A. africanus (3.0-2.0) South Africa
A. garhi (2.5) Ethiopia
A. robustus (2.0-1.0) East/South Africa
A. boisei (2.6-1.2) East Africa
*Homo habilis lived alongside A. boisei for about a million years.
A. anamensis
kenya; 4-3 mil
A. afarensis
(3.8-3.0) East Africa
A. africanus
(3.0-2.0) South Africa
A. garhi
(2.5) Ethiopia
A. robustus
(2.0-1.0) East/South Africa
A. boisei
*Homo habilis lived alongside A. boisei for about a million years.
Hominin Evolutionary Trends
- Body size2. Locomotion (movement towards bipedalism)
- Cranial capacity (bigger brains)
- Tool use
- Dentition (diets based on teeth)
- Cranial morphology (brow ridge, sagittal crest)
- Diet
Bipedalism
Ability to see over tall grassAbility to carry items
Reduces body’s exposure to solar radiation
Bipedalism and Physiological Traits
Pelvis forms a basket that balances the weight of trunk Ability to carry items
Dentition and Diet
large molar size in correlation to diet; coarse gritty vegetation for heavy chewing on fibrous foods
Gracile and Robust Australopithecines
Robust - large post canine teeth, large molars, incisors canines reduced, flatter faces, large chewing muscles = heavy brow ridge, large zygomatic arches Gracile - reduced zygomatic arch, less robust features in general
Oldowan Tools
- used for animal butchering enabled some species to become omnivorous - Cores and flakes - flakers were good for cutting and animal butchering
- Choppers for pounding, breaking, or bashing
Competition and Australopithecine Extinction
- Tool users displaced other hominins, pushing them into drier, less diverse zones, and some ultimately to extinction - Ppl thought Homo habilis was first tool user but A. garhi also used tools
H. habilis
- coexisted w A. boisei for a million years (2.4 - 1.7 mya) - relatively large brain
- long arges, small body (similar to a chimp)
- used Oldowan tools
H. erectus
- 200,000 yrs after habilis - modern body and limbs
- even larger brain size
- rapid evolution
H. neandertalensis
- adapted to cold enviornments - large torso with shorter limbs
- face pulled forward and broad long nose for added insulation for the brain
- more cranial capacity than modern humans
- used Mousterian tools
- wore fur hides
- diet was all meat
H. floresiensis
- 95,000 - 12,000 BP - found on an island near Indonesia
- hobbit-like, human features
- very small brain
Hunting and Diet and Fire
- Ability to make and control fire enabled humans to cook veggies, meat, feed young and old members soft foods, eliminated parasites - Increased reliance on hunting created a less robust cranial morphology and dentition
Anatomically Modern Humans
Homo erectus split into two groups: ancestral Neanderthals and Anatomically Modern Humans (AMH) early ones are known as Cro-Magnon
Behavioral Modernity
- symbolic thought, elaboration cultural creativity - explosion of creativity - more developed/mentally and with the natural habitat
- EX: Lascaux cave paintings. Cauva de Las Manos, Argentina cave paintings of hands using red ochre (9,000-12,000 yrs ago)
Punctuated Equilibrium
periods of stasis followed by periods of rapid change
Hominin Tool Traditions
- Oldowan associated w Australopithecines 2. Acheulian associated w Homo erectus
- Mousterian associated w Homo neaderthals
- Upper Paleolithic (blade-like tools) associated w Homo sapien sapiens
Out of Africa
Immature Birth
Elastic skull (malleable) was how genus homo dealt with problem of brain size and birth canals
Bipedalism and Brain Size
Too big of birth canals impede with bipedalism Narrow birth canals = smaller heads but brains continue to grow outside of the womb
Barwinians to Lamarckian Selection
group selection becomes major factors in species success and inclusiveness
Neanderthal DNA
Neandertal DNA, when compared to modern human DNA, is different at 27 locations. The same section of modern human DNA, gathered from populations around the world, has only 5-8 differences. This suggests that the neanderthal ancestors split from Homo sapiens about 300,000 years ago (last common ancestor)
Cave of Forgotten Dreams
Video we watched in class w the big cave. Can’t walk on the ground. in Chauvet Cave, France. Up to 32,000 yrs old. Shows complexity and modern thought.
In general, foraging societies tend to be
egalitarian (equality for all people)
Kottak and the Bible place humans in an original ________ which is preferable to the kinds of societies we live in now
state of nature
Western history idealizes ________ societies
hunter/gatherer
Broad spectrum revolution
hunted, collected, and fished a broader spectrum of resources in multiple locations -varied and diverse diets
______ was revolutionary in the middle east because it led to food production
Broad spectrum revolution
By 7K BP, people were abandoning broad spectrum economies in favor of economies based on ________ sources of food
few domesticated
The vertical economy
Consists of 4 geographically close, but very different env. zones: 1. highland plateau (highest part of land)
2. Hilly flanks (subtropical wooded zone)
3. Piedmont steppe (treeless plain)
4. Alluvial plain (very fertile soil region)