Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Population Ecology


Published on

Published in: Technology, Health & Medicine
  • Be the first to comment

  • Be the first to like this

Population Ecology

  1. 1. Zebra Population EcologyFlamingos Yellow Fusiliers
  2. 2. Populations increaseor decrease based onfour variables... • Births • Immigration Black Wildebeest • Deaths • Emigration Leatherback Turtle
  3. 3. Most populations are distributed in ‘clumps’• Advantages • Resources tend to be found in patches • There is better protection • Better chances for a meal (lions, wolves) Cape buffalo being pursued by lions in Botswana • Mating and care of young
  4. 4. Characteristics of a population...• Age Structure • Pre- reproductive • Reproductive • Post- reproductive Fifi and her kin
  5. 5. Limits on a population...• Carrying Capacity is determined by... • Environmental Resistance: disease, food, water, weather, predation • Biotic Potential: intrinsic rate of growth
  6. 6. Exponential and Logistic Growth• Exponential Growth or the J-shaped curve • no limits to reproduction or resources• Logistic Growth or the S- shaped curve • Environmental resistance brings population within carrying capacity
  7. 7. TapewormSpecific Examples ofEnvironmental Resistance • Density Dependent Factors • food, disease, predators, parasites • Density Independent Factors • weather, natural disasters, habitat loss, pollution Deforestation in The Philippines
  8. 8. Predator-PreyRelationships• Bottom-Up Control • Snowshoe Hare and Lynx in Canada • Natural fluctuation in prey population Lynx regulates the predator• Top-Down Control • Wolf and Elk relationship in Yellowstone Snowshoe Hare
  9. 9. Reproductive Patterns and Survival Strategies• R-selected species • early sexual maturity/early reproduction • lots of young/high mortality of young • minimal care of young • high growth rate/ Locust Swarm in Mauritania low life expectancy
  10. 10. More SurvivalStrategies...• K-selected species • late sexual maturity late reproduction • low birthrate/low mortality of young Humpback female • parental care of young and calf • low population growth rate
  11. 11. A Few Final Words...• K-selected species • prefer mature, stable ecosystems • comprise the majority Philippine Eagle of Endangered Species• R-selected species • excellent at colonizing ‘disturbed’ ecosystems