Habitat selection

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Habitat selection
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Habitat selection
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Habitat selection
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Habitat selection
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Habitat selection
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Habitat selection
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Hive location as a group decision process

• Hive selection is a balance between spacing and
  site quality
• Spacing force dependent on resource scarcity
  (northern vs. southern)
• Site quality force dependent on cavity and
  opening dimensions

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• Habitat selection sex specific disruption in
  beldings ground squirrel
• Key points here are
• Resource defense
• Competitive release
• Avoidance of in-breading depression

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The effect of in-breading on reproductive success
Differential dispersion insures out-breading
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Migration how could it have evolved?
Arctic tern
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The evolution of habitat selection The Least
tern
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• Adaptive landscapes Evolving from one state to
  another
• Sewall Wright developed the concept of the
  adaptive landscape as a means to describe changes
  in fitness resulting from changing evolutionary
  pressures over evolutionary time.
• This is a heuristic that characterizes the
  complex summation of evolutionary forces.
• Can be used to describe population-level changes
  in gene/allele distributions for polygenetic
  traits as a function in there changing fitness
  values
• Can be used to describe the ecological forces
  (that act on gene/allele distributions for
  polygenetic traits) on phenotypes
• Concepts
• Directional selection The systematic culling of
  a population from one side of a distribution and
  survival of the portion of a population on
  another.
• Stable Equilibrium a set of traits existing in a
  population over evolutionary time because changes
  in those traits are detrimental.
• Unstable Equilibrium a condition where one or
  multiple selective pressures emerge and enhance
  the likelihood of divergence (speciation).
• Local optimum a region of the landscape that is
  adaptive and isolated from other adaptive peaks.
• Genetic Drift under conditions of no selective
  pressure random mutations change
  genotypes/phenotypes in random directions. Allows
  a population to explore the fitness surface

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Habitat selection the Lesser tern