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Friday Meet in the Computer Lab

Friday Meet in the Computer Lab. # Area. Chapter 53 Population Ecology. Measuring Density 1. Indirect 2. Direct 3. Mark - Recapture. Factors Influencing Carrying Capacity (negative feedback). Signs left by organisms (nests, tracks, droppings).

george-guthrie
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Friday Meet in the Computer Lab

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  1. Friday Meet in the Computer Lab

  2. # Area Chapter 53 Population Ecology Measuring Density 1. Indirect 2. Direct 3. Mark - Recapture Factors Influencing Carrying Capacity (negative feedback) Signs left by organisms (nests, tracks, droppings) • Density Dependent Factors • Food • Predation • Territoriality • Disease • Waste & Intrinsic Factors • Density Independent Factors • Weather • Habitat disruption Counting actual animals # of Toads per acre dN = rmaxN dt Most population are influenced by both factors Exponential Growth “J” curve dN = rmaxN (K-N) dt K Logistic Growth K (carrying capacity) Factors influencing the rmax (Biotic Potential) 1. # of Offspring 2. Generation time 3. Reproductive age 4. Sex ratio r – Opportunistic vs. K- Equilibrial Life Span Short Long Maturation Short Long Death Rate High Low Offspring Many Few Parental Care None Extensive Reproductive Age Early Late Survival Curve Type III Type I Examples: Do cane toads have high Biotic Potential? Time Cane toad Dolphin / Elephant Are Humans r’s or K’s ?

  3. Data on Human Population Growth r or K? Annual percent increase in the global human population (data as of 2011) What is the Earth’s Carrying Capacity? Slide 1

  4. Population Density and Number of Offspring Soay Sheep on the Island of Hirta Slide 1

  5. Lynx and Snowshoe Rabbit Populations Which do you vote for…. lynx or rabbit? Slide 1

  6. Typical Survival Curves Activity: Survivalship Curves Slide 1

  7. Experimental Evidence of Carrying Capacity Slide 1

  8. If this population was harvested for food, what population number would be the most sustainable to maintain the population and provide the greatest amount of food.? Answer: 1. Harvest only up to a population # 500 2. Harvest no more then 13 every year Slide 1

  9. Requires 2 capture events: 1. All members of the first capture are marked • The marked members of the second capture will give a percentage of how many are in the total group Calculations # of total population = # marked in first capture (X) total # in second capture # of recaptures in second capture Do Activity: Guano Island Slide 1

  10. Density Types Clumped Random Slide 1 Uniform

  11. Elephant Population Growth of Kruger National Park, South Africa All organisms can demonstrate exponential grow in favorable conditions. Slide 1

  12. Population Dynamics Slide 1

  13. Density-dependent regulation by predation Slide 1

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