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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. - PowerPoint PPT Presentation
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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
http://www.rareconservation.org/blog/index.php?paged=2
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 factors that determine carrying capacity…
• 2) Food Chains• Limited by the
quantity of available food
• Limited by predators
http://www.intarttiles.com/robertekennedy.htm
Predation
• Prey have developed defence mechanisms to prevent them from getting eaten:– Poison– Mimicry– Camouflage– Armour– Secretions
Poison
MimicryNorth American Monarch or the Viceroy – can you tell the difference?
Poison! Warning!(Except one isn’t!)
• Coral Snake • King Snake
Camouflage
• Evolution of moths before and after the industrial revolution
Protective Armour
Protective Secretions
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
4 factors that determine carrying capacity
• 4) Population Density : 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
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/
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
Show your Understanding
• Complete: pg. 24 # 1 – 6
• Homework: Complete worksheet on Population Density