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Published byJonathan Rogers Modified over 9 years ago
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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. ;-)
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Population Ecology: What are the rules? They don’t apply to us, do they?
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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.
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LAW #1: Populations will grow exponentially according to their biotic potential
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Linear growth ($1/day) vs. exponential growth ($0.10/doubles every day)
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The J Curve
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unlimited resources Reproduce early in life Short generation time Reproduce often Multiple offspring leads to exponential growth Biotic potential or intrinsic rate of increase
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LAW #2: Populations cannot increase indefinitely
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Sigmoidal growth model The S Curve
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Carrying capacity The number of individuals of each species that can survive in an area indefinitely. Set by limiting factors
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Two categories of limiting factors 1. density- independent limiting factors Natural disasters Clear cutting
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2. Density-dependent limiting factors Food Mates Space Disease Disease predators
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A.Exponential Growth B.Actual Logistical Growth C.Predicted Logistical Growth D.Linear Growth E.Carrying Capacity (K)
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LAW # 3: There is more than one strategy for getting your genes into the next generation
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Reproductive similarities?
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Opportunists vs. Competitors
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5 min. coloring break Draw your favorite r- and K- selected species Decorate the picture with reproductive strategies
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Survivorship curves
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Population density and population distribution patterns affect mating habits.
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LAW #4: Predator and prey develop a predictable pattern (Lotka-Volterra Model).
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Caption Contest!
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Predict the graph of wolf and moose populations sizes over 50 years… (sketch graph it…)
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Lotka-Volterra model Cyclical!
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Number of individuals Time Irruptive Stable Cyclic Irregular Four Types of Population Curves Are these logistical or exponential? WHY?
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What species is this? What keeps this population “in check”?
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Soooo... Good thing we’re human and these rules don’t apply to us... Right?
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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)?
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