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Population Dynamics. Characteristics of Populations Factors Limiting Populations Human Populations.

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Population Dynamics

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Population dynamics

Population Dynamics

Characteristics of Populations

Factors Limiting Populations

Human Populations

http://filipinofreethinkers.org/wp-content/uploads/2011/12/Philippine-Lugaw-Line.jpg, http://www.pensoft.net/J_FILES/1/articles/2447/export.php_files/ZooKeys-200-001-g007.jpg, http://farm6.staticflickr.com/5191/7238292574_47bdff313f.jpg

Population dynamics

http://phycology.mlml.calstate.edu/images/Canopy.jpg, http://bioweb.uwlax.edu/bio203/s2008/bluske_brit/yawning.jpg

Characteristics of populations

Characteristic # 1

Characteristics of Populations

  • Geographic distribution or range

    • Area inhabited by a population

      “The Philippine tarsier (Tarsiussyrichta) is endemic to the southern Philippine islands of Bohol, Samar, Leyte and Mindanao, where it thrives mostly in secondary forests and dense patches or thickets of bush, tall grass and bamboo.”


Population dynamics

Characteristic # 2

http://www.unisdr.org/, http://www.nscb.gov.ph/factsheet/pdf08/FS-200806-SS1-01.asp

Population dynamics

Characteristic # 3

  • Population dispersion

    • Patterns of spacing in relation to other members of the population

    • Clumped, uniform, random

Concepts and Connections 2002 by Campbell

Population dynamics

Characteristic # 4

  • Growth rate, r

    • change in the number of individuals in a population per unit time

  • Factors affecting population size:

    • # of births

    • # of deaths

    • # of individuals leaving/entering

      • Immigration = into

      • Emigration = exit

         # of individuals added to/taken from the population

If r = pop’n growth rate

b = birth rate/natality

d = death rate/mortality

i= rate of immigration

e = rate of emigration

Express r in terms of b, d, i, and e.

r = (b+i) – (d+e)

http://mysite.verizon.net/res15tbbv/sitebuildercontent/sitebuilderpictures/animal-migration.jpg, http://pull.imgfave.netdna-cdn.com/image_cache/1288987440350429.jpeg

Population dynamics

Characteristic # 4 (con’t)

  • Growth rate, r

    • Exponential growth

      • Individuals in a population reproduce at a constant rate

      • ex. bacterial reproduction: binary fission


Population dynamics

Characteristic # 4 (con’t)

  • Growth rate, r

    • Exponential growth

      • Individuals in a population reproduce at a constant rate

  • Logistic growth

    • Population’s growth slows/stops following a period of exponential growth






Population dynamics

Characteristic # 4 (con’t)

  • Growth rate, r

    • Logistic growth

      • Biotic potential, rmax

        • Max rate at w/c a population could increase under ideal conditions

      • Environmental resistance

        • Unfavorable conditions that prevent a population from reaching its rmax

      • Carrying capacity, K

        • Max # of individuals a given environment could support with its limited resources

Population dynamics


Survivorship curves

Survivorship Curves


Factors limiting populations

Factors Limiting Populations

  • Limiting factor- factor that causes population growth to decrease

    • Density-dependent factors

      • Becomes limiting only when population reaches a certain level; mostly biotic factors

    • Density-independent factors

      • Affects all populations in similar ways, regardless of population size; mostly abiotic factors


Factors limiting populations1

Factors Limiting Populations

  • Competition

  • Crowding and stress

  • Human disturbances

  • Natural catastrophes

  • Parasitism and disease

  • Predation

http://thumbs.imagekind.com/member/3f58d983-4020-4101-a3fb-1e3d67c818ac/uploadedartwork/650X650/d6b32ac0-cede-4422-882d-1723572d56f7.jpg, http://reachthetribes.com/200909/big/kaingin.JPG, http://static.guim.co.uk/sys-images/Technology/Pix/pictures/2009/10/21/1256124500714/Mount-Pinatubo-eruption-i-001.jpg, http://s3.hubimg.com/u/593274_f260.jpg

Human population growth

Human Population Growth

  • Which model of pop’n growth (exp’l vs. logistic) does the human pop’n follow?

    • Human pop’n size has increased through time

  • What factors have controlled human pop’n growth through the centuries?

    • Centralized agriculture

    • Infectious disease

    • Industrial, technological revolutions

    • Modern medicine


Populations in developing vs industrialized countries

Populations in developing vs. industrialized countries

  • What does this graph tell us about birth rates in different countries?

  • What about death rates?

Demographics age structure and sex ratio


DemographicsAge structure and Sex-ratio

  • What do these graphs tell us about birth rates in different countries?

  • What about death rates?

  • What can age structure diagrams tell us about the population?

Population dynamics

  • What are the effects of human population growth?

  • What are the effects of different lifestyles?


Ecological footprints

Ecological Footprints


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