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Population Ecology. Chapter 52. Population - group of individuals living in same area at same time. Population density - # of individuals per unit area. Population dispersion - arrangement of population in area. Dispersion patterns happen 3 ways. 1 Clumped dispersion - individuals in groups.

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Population ecology

Population Ecology

Chapter 52



  • Dispersion patterns happen 3 ways. same time.

  • 1Clumped dispersion - individuals in groups.

  • 2Uniform dispersion – individuals evenly spaced out.

  • 3Random dispersion - individuals live regardless of where other individuals live.


CLUMPED same time.


UNIFORM same time.


RANDOM same time.






The agave plant reproduction and survival.


  • 2 reproduction and survival.Repeated reproductive episode - organism produces smaller numbers of offspring.

  • This is also known as iteroparity.





Carrying capacity population density on rate of increase.

equals change in

population size


Carrying population density on rate of increase.

capacity

Cannot exceed

carrying capacity



  • 2 factors determine the growth of a population. population density on rate of increase.

  • 1Density-dependent factors increase their effect as density increases (negative feedback)

  • 2Density-independent factors - not affected by density increase.



As # of planted seeds increase, population density on rate of increase.

# reproducing decreases