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Please pass back the new objective sheet.
Please get out your signed permission slip and $15 for pick up.
Take your “Tradeoffs- Sage Grouse and energy” reading packet and answers to the back lab table. Staple them together and put them in the white bin.
Only 6 more days to get that
permission slip turned in!
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What do you think of this?
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WHAT ARE THE RULES? THEY DON’T APPLY TO US, DO THEY?
Population Ecology
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Rule #1: Populations will grow exponentially
according to their biotic potential
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Linear growth vs. exponential growth
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Biotic potential – capacity for growth
Age at reproductive maturity
Generation timeTime between
reproductive eventsOffspring per
reproductive event
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Rule #2: Populations cannot increase
indefinitely
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Sigmoidal growth – the S curve
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Carrying capacity
The number of individuals of each species that can survive in an area indefinitely.
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Subtle details!
At carrying capacity (K), individuals are still dying and being born. The total population size is constant.
Populations do not know when they’ve reached K
Populations cycle above and below K several times before leveling out.
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Limiting factors set the carrying capacity
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Two categories of limiting factors
1. density-independent limiting factorsNatural disastersClear cutting
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2. Density-dependent limiting factors Food Mates Space Disease predators
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Rule#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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Reproductive similarities?
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Opportunists vs. Competitors
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Survivorship curves
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Rule #4: Predator and prey develop a predictable
pattern.
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Lotka-Volterra model
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Soooo . . . Good thing we’re human and these rules don’t
apply to us . . . Right?
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Or do they? What part(s) of the sigmoidal curve do you see?
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?