Please pass back the new objective sheet.

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Only 6 more days to get that permission slip
turned in!

• 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.

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What do you think of this?
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Population Ecology

• What are the rules? They dont apply to us, do
  they?

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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 time
• Time between reproductive events
• Offspring 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 theyve 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 factors
• Natural disasters
• Clear cutting

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

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Rule3 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 were human and these
rules dont 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?