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When you come to the end of your rope, tie a knot and hang on. ~Franklin D. Roosevelt

When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

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When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt. Exit Card. Name 3 general models that are used to estimate a population’s size. How do element cycles (carbon, nitrogen, phosphorus, etc.) affect a population size - PowerPoint PPT Presentation

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Page 1: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

When you come to the end of your rope, tie a knot and hang on. ~Franklin D. Roosevelt

Page 2: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

Exit Card

1. Name 3 general models that are used to estimate a population’s size.

2. How do element cycles (carbon, nitrogen, phosphorus, etc.) affect a population size

3. Should humans intervene with at-risk populations that have not been disturbed by humans?explain.

Page 3: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt
Page 7: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

Changing population density

Page 9: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

• “You decide to invest $1000 in a savings account. Your investment will grow at a rate of 10% each year. Assuming that you reinvest the interest each year, how much money will you have in 30 years?”

Page 10: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt
Page 11: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt
Page 12: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

Doubling Time and the Rule of 70

• Calculating the time it will take for a population (or money) to double.

• Exponential growth at a constant rate only• Divide 70 by the percentage growth rate.

Page 13: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

If the population of rabbits in an ecosystem grows at a rate of

approximately 4 percent per year, the number of years required for the rabbit

population to double is closest to

a. 4 years b. 8 years c. 12 years d. 17 years e. 25 years Solution: 70/4 = 17.5 years, the closest answer to 17.5 would be “d” 17 years.

Page 14: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

Logistic Growth Model• Logistic growth- when a population whose growth is

initially exponential, but slows as the population approaches the carrying capacity.

• S-shaped curve- when graphed the logistic growth model produces an “S”.

Page 15: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

What influences carrying capacity?Density Dependent factors : (pop density is affected because of its size)• Food supply • Habitat for living and breeding• Parasitism• Predation risk

Page 16: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

Extreme Animal Myth

• Do Lemmings take density depended factors too far? And go into madness?

Page 18: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

What influences carrying capacity?• Density Independent Factors: (pop density is

affected regardless of its size)• Natural disasters (floods earthquakes, fires• Human hunting• Changes in chemicals present•

Page 19: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

Management1. What type of growth model is the

elephant population illustrating?2. Explain two concerns with this and

its likely outcome if continued 3. What is the reproductive strategy of

the elephant (r-selected or k-selected?(explain your answer)

4. Draw a survivorship curve that best exhibits that best exhibits the elephants lifetime survivorship.

5. Create a plan to stabilize the population of the elephants.

Page 20: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt

Management1. What type of growth model is the elephant

population illustrating?Exponential Growth Model2. Explain two concerns with this and its likely outcome if continuedDisease or starvation = concernsLikely outcome is a population crash3. What is the reproductive strategy of the elephant (r-selected or k-selected?(explain your answer)K-selected4. Draw a survivorship curve that best exhibits that best exhibits the elephants lifetime survivorship.5. Create a plan to stabilize the population of the elephants.

K Stable environment, density dependent interactionslarge size of organismenergy used to make each individual is highfew offspring are producedlate maturity, often after a prolonged period of parental carelong life expectancyindividuals can reproduce more than once in their lifetimetype I or II survivorship patternin which most individuals live to near the maximum life span

Page 23: When you come to the end of your rope, tie a knot and hang on.  ~Franklin D. Roosevelt