Homo pan gorilla pongo same size more energy humans

This preview shows page 29 - 31 out of 40 pages.

Homo > pan > gorilla > pongo (same size, more energy) Humans = high metabolism (energy/day), high fat stores, and food sharing: keys to evolving large brains, allow energy for larger brains, food sharing for longer periods of time after weaning, allows more time for learning opportunities and brain growth (longer periods of juvenile age), can shape how other things evolve chimps of age 3 start foraging, less learning opportunities humans are higher in brain size and body weight modern humans are 4.75 over the trendline, Encephalization quotient is high, cabus and saimiri are also high, high brain size, use tools heterochrony: evolutionary change in the rate or timing of growth (different between humans and chimps) humans and chimps have a similar brain growth rate until 8 months, human brains growth speeds up faster than chimps after 8 months, % of adult body mass of brains speeds up and continues higher in humans than chimps, humans keep growing brains at same rate, stoping point for brain growth is later human babies grow their brains really faster compared to chimp babies, body growth is similar in chimps and humans result: relatively big brains in humans our cranial bones don’t fuse that quickly, soft humans and chimps have similar body mass growth throughout months since conception (% adult body mass, not same, just our aim towards our final mass goal) the trajectory of chimps and humans of how our body grows is approximately similar Humans: long lives, slow growth, less offspring Life history: the pace of growth, reproduction, and aging embryonic development, birth, infant, weaning, growth, maturity, reproduction and maintenance, death bigger animals reproduce less
Anthp 4/25 Trade offs in life history reproduce early gets 1 more reproductive cycle growth vs. reproduction; when to switchfemales (12—>4-5) mature earlier than males (7-4), but overtime, age of maturity goes down and plateaus (matures at 12 years old —> matures at 4 years old), females can reproduce at such a young age! primates: as age a maturity goes up, age at death goes up (positive relationship) as primates live longer, primates mature at a later age reproduction vs. maintenance investment: energy spent on reproduction isn’t available for maintenance as number of offspring go up, % of parents surviving goes down (negative relationship) if parents have less kids, parents survive longer or at a greater rate parents have set amount of offspring, if a lot of energy investment in kids, you don’t have enough net energy to stay alive 3.size vs. quantity of offspringmany offspring = less investment in each one, born smaller (ex: mice), invest lightly, pizza is sliced up into many slices few offspring = lots of investment in each one, born bigger (ex: elephant), invest heavily, has a higher probability of surviving because mom has invested so much energy into that baby (food and energy and all eggs in 1 basket), a whole pizza fast vs. slow life historyfast = faster weaning, growth, maturity, reproduction and maintenance, death

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture