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1.3 Populations

1.3 Populations. http://www.whale-images.com/endangered-mammals-80-pictures.htm. Carrying Capacity. It’s the maximum population that an environment can sustain. Seychelles Paradise Flycatcher needs one acre of mixed forest per breeding pair. They live on the little island of Madagascar.

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1.3 Populations

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  1. 1.3 Populations http://www.whale-images.com/endangered-mammals-80-pictures.htm

  2. Carrying Capacity • It’s the maximum population that an environment can sustain. • Seychelles Paradise Flycatcher needs one acre of mixed forest per breeding pair. They live on the little island of Madagascar http://www.rareconservation.org/blog/index.php?paged=2

  3. 4 factors that determine carrying capacity • 1) MATERIALS & ENERGY • Limited by the quantity of light. energy • Amount of water, carbon & other materials http://www.condorjourneys-adventures.com/costarica_nature.asp http://weathersavvy.com/Q-Climate_DesertsHot.html

  4. 4 factors that determine carrying capacity… • 2) Food Chains • Limited by the quantity of available food • Limited by predators http://www.intarttiles.com/robertekennedy.htm

  5. Predation • Prey have developed defence mechanisms to prevent them from getting eaten: • Poison • Mimicry • Camouflage • Armour • Secretions

  6. Poison

  7. Mimicry North American Monarch or the Viceroy – can you tell the difference?

  8. Poison! Warning!(Except one isn’t!) • Coral Snake • King Snake

  9. Camouflage Evolution of moths before and after the industrial revolution

  10. Protective Armour

  11. Protective Secretions

  12. 4 factors that determine carrying capacity • 3) Competition • For food, water, mates & space. • Intraspecific Competition: Between individuals of the same species. • Interspecific Competition: Between different species. http://www.maxi-fond-ecran.com/fond-ecran-photo-paon/paon/telecharger-fond-ecran-photo-paon-p18507.html http://www.tnstate.edu/ganter/B412%20Lab2%20PlantComp.html http://www.allposters.com/-st/Elephant-Posters_c646_p3_.htm

  13. 4 factors that determine carrying capacity • 4) PopulationDensity : Number of individuals that are living in the same place at the same time. http://reliableanswers.com/images/wallpaper/penguin_party.jpg http://www.naturetrek.co.uk/wildlife-holidays/wildlife-holidays.asp?ID=3

  14. Density dependent Factors • When the density has gone beyond an appropriate level • Over-population can: • Increase stress & lead to the easier spread of diseases and parasites • Increases aggressions & causes parents to neglect offspring • So, then the population will decrease http://www.envirowarrior.com/animal-abusers-the-worst-polluters/

  15. Density Independent Factors • Limits the population- no matter what the density is. • Forest fires • Earthquakes • Volcanic Eruptions • Tornadoes http://tiee.ecoed.net/vol/v3/issues/frontier_sets/yellowstone/sci_teaching.html

  16. Show your Understanding • Complete: pg. 24 # 1 – 6 • Homework: Complete worksheet on Population Density

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