Paul Andersen explains how populations eventually reach a carrying capacity in logistic growth. He begins with a brief discussion of population size ( N ), growth rate ( r ) and exponential growth. He then explains how density dependent limiting factors eventually decrease the growth rate until a population reaches a carrying capacity ( K ). A mathematical simulation of this process is included along with a brief discussion of r and K selected species.
Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound: http://www.freesound.org/people/CosmicD/sounds/72556/
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“File:Frog in Frogspawn.jpg.” Wikipedia, the Free Encyclopedia. Accessed April 19, 2013. http://en.wikipedia.org/wiki/File:Frog_in_frogspawn.jpg.
“File:Stress-coloured Brookesia Desperata Female with Two Recently Laid Eggs.png.” Wikipedia, the Free Encyclopedia. Accessed April 19, 2013. http://en.wikipedia.org/wiki/File:Stress-coloured_Brookesia_desperata_female_with_two_recently_laid_eggs.png.
Nevit. English: White Rabbit, 2011. Own work. https://commons.wikimedia.org/wiki/File:Rabbit_nevit.svg.
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https://www.khanacademy.org/science/hs-biology/x4c673362230887ef:matter-and-energy-in-ecosystems/x4c673362230887ef:population-growth-and-carrying-capacity/a/population-growth-and-carrying-capacity-article
Learn about population growth rates and how they can be modeled by exponential and logistic equations.
Watch the next lesson: https://www.khanacademy.org/science/biology/ecology/population-growth-and-regulation/v/density-dependent-and-density-independent-population-regulation
Missed the previous lesson? Watch here: https://www.khanacademy.org/science/biology/ecology/population-ecology/v/organism-life-history-and-fecundity
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