Lecture 15 Flashcards

1
Q

What limits growth rates and population sizes?

A

Density Dependent factors
-Change in intensity as a function of population size
Density Independant Factors
-Alter birth and death rates irrespective of population size

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2
Q

What factors might regulate populations in a density independent fashion?

A

Usually abiotic

  • Variation in weather patterns
  • Catastrophic Events (Droughts, hurricanes, tornados, cold snaps, floods)
  • Density dependent factors can interact with density independent factors to control population growth
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3
Q

Life History Characteristics

A

Life History traits govern fluctuations in populations size through time

  • age when they 1st reproduce
  • how often they reproduce
  • number of offspring they have at a time
  • amount of energy invested in each offspring
  • average lifespan
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4
Q

Major Ideas from population growth

A

Exponential growth
-b and d (and therefore r) are constant, doubling time is also constant
Logistic Growth
-r varies; High when N is small, resources are abundant
-Low when N is near carrying capacity, resources scarce
Organisms vary in survival and reproduction traits (life history)

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5
Q

Maximum Sustainable Yield (MSY)

A

Highest rate at which a potentially renewable resource can be used indefinitely without reducing its available supply
-MSY=K/2

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