Bio351 tarahillextracredit
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Bio351 tarahillextracredit

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Bio351 tarahillextracredit Bio351 tarahillextracredit Presentation Transcript

  • Population GrowthBiotic Potential=-promotes positive growth-intrinsic factors(litter size, gestation)Environmental Resistance=-limits growth-extrinsic factor(weather, food supply)
  • Patterns of growthExponential growth (J shaped curve)• biotic potential(rm)=maximum value
  • Logistic growth (S shaped)K=carrying capacity=population size that isbased on number of resources available
  • Limiting factors:Density dependent:-competition-disease-predation-foodDensity independent:-weather-catastrophes
  • Natural Selection:• limiting factors placestresses on a population• the best adapted organismswill survive and get toreproduce and pass on theirgenes with the adaptationto their offspring• over long periods of timethis can lead to a change inspecies
  • Population GrowthBiotic Potential=-promotes positive growth-intrinsic factors(litter size, gestation)Environmental Resistance=-limits growth-extrinsic factor(weather, food supply)
  • Patterns of growthExponential growth (J shaped curve)• biotic potential(rm)=maximum value
  • Logistic growth (S shaped)K=carrying capacity=population size that isbased on number of resources available
  • Limiting factors:Density dependent:-competition-disease-predation-foodDensity independent:-weather-catastrophes
  • Natural Selection:• limiting factors placestresses on a population• the best adapted organismswill survive and get toreproduce and pass on theirgenes with the adaptationto their offspring• over long periods of timethis can lead to a change inspecies
  • • proportionally massive eyesmaking vision acute for locatingprey• movable ears for better hearingmaking them good nocturnalhunters• can rotate their heads a full 180degrees to help them avoidpredators such as wild cats• Long back legs to help themjump twenty feet, an importantsurvival skill in the jungle• Long tail providing power forjumping and holding onto treeEx:Phillipine Tarsier
  • Survivorship curves:-based on a cohort of individuals from birth untildeath-cohort=a group of individuals of the same age-survivorship curves are meant to show thenumber of individuals surviving at each agefor a particular species-three types of curves
  • Type 1=good early survival, die of old age, lowbirth rates, provide lots of parental care(humans)Type 2=die at constant rate regardless of age(birds, lizards)Type3 =poor early survival,survival thatimproves withage, lots of offspring, lowparental care(fish,plants)
  • Life History Patterns:r selected species: species inhabiting fluctuatingor unpredictable environments-environmentskeep populations below carrying capacity (lotsof predation, competition over resources)k selected species-species inhabiting stable,predictable environments-keep populationsize near carrying capacity and resources arescarce