Warm It Up Answer the following in your notes spiral: a. Identify a time when exponential growth can be beneficial. b. Predict the carrying capacity (K)

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Presentation transcript:

Warm It Up Answer the following in your notes spiral: a. Identify a time when exponential growth can be beneficial. b. Predict the carrying capacity (K) of this classroom. ;-)

Population Ecology: What are the rules? They don’t apply to us, do they?

Boy, do I have a deal for you! Choose your preference: Choice A: I’ll give you $1 every day for the next 10 days Choice B: I’ll give you 10 cents today and double that every day.

LAW #1: Populations will grow exponentially according to their biotic potential

Linear growth ($1/day) vs. exponential growth ($0.10/doubles every day)

The J Curve

unlimited resources Reproduce early in life Short generation time Reproduce often Multiple offspring leads to exponential growth Biotic potential or intrinsic rate of increase

LAW #2: Populations cannot increase indefinitely

Sigmoidal growth model The S Curve

Carrying capacity The number of individuals of each species that can survive in an area indefinitely. Set by limiting factors

Two categories of limiting factors 1. density- independent limiting factors Natural disasters Clear cutting

2. Density-dependent limiting factors Food Mates Space Disease Disease predators

A.Exponential Growth B.Actual Logistical Growth C.Predicted Logistical Growth D.Linear Growth E.Carrying Capacity (K)

LAW # 3: There is more than one strategy for getting your genes into the next generation

Reproductive similarities?

Opportunists vs. Competitors

5 min. coloring break Draw your favorite r- and K- selected species Decorate the picture with reproductive strategies

Survivorship curves

Population density and population distribution patterns affect mating habits.

LAW #4: Predator and prey develop a predictable pattern (Lotka-Volterra Model).

Caption Contest!

Predict the graph of wolf and moose populations sizes over 50 years… (sketch graph it…)

Lotka-Volterra model Cyclical!

Number of individuals Time Irruptive Stable Cyclic Irregular Four Types of Population Curves Are these logistical or exponential? WHY?

What species is this? What keeps this population “in check”?

Soooo... Good thing we’re human and these rules don’t apply to us... Right?

In Closing… Name two density-dependent and two density-independent factors that apply to humans. Are we r- or K- strategists? Defend your answer. How do humans avoid the Lotka-Volterra model (elliptical oscillation)?