Ecological succession | Middle school biology | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now!Ecological succession is how ecosystems develop and change over time. Primary succession happens in areas where no life existed before, like bare rocks or a newly sunken ship. This process begins with small organisms that can tolerate harsh conditions, called early successional species. Secondary succession occurs after a disturbance in an existing ecosystem, as remaining organisms begin to grow and a new community gradually forms.
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“Container Ship, Cargo Boat” by freddy dendoktoor, licensed under a Creative Commons Attribution License (CC0 1.0): https://www.publicdomainpictures.net/en/view-image.php?image=497526&picture=container-ship-cargo-boat
“US Navy 040105-N-8629M-005 A tugboat tows the decommissioned aircraft carrier Midway into San Diego bay” by U.S. Navy/Rebecca J. Moat, public domain: https://commons.wikimedia.org/wiki/File:US_Navy_040105-N-8629M-005_A_tugboat_tows_the_decommissioned_aircraft_carrier_Midway_into_San_Diego_bay.jpg
“US Navy 060417-N-6031Q-010 Engineering Technicians for Computer Science Corporation (C.S.C.) Beddy Mcbride and Allen Dunbar, overlook the decommissioned aircraft carrier USS Oriskany” by U.S. Navy/David R. Quillen, public domain: https://commons.wikimedia.org/wiki/File:US_Navy_060417-N-6031Q-010_Engineering_Technicians_for_Computer_Science_Corporation_%28C.S.C.%29_Beddy_Mcbride_and_Allen_Dunbar,_overlook_the_decommissioned_aircraft_carrier_USS_Oriskany_%28CVA_34%29.jpg
“USS Oriskany sinking” by U.S. Navy, public domain: https://commons.wikimedia.org/wiki/File:USS_Oriskany_sinking.jpg
“Artificial Reefs Attract Abundant Fish” by U.S. National Park Service, public domain: https://npgallery.nps.gov/AssetDetail/945cf2b2-98b3-f05e-84dd-01d3db574455#
“Diver on a section of shipwreck” by U.S. National Park Service, public domain: https://npgallery.nps.gov/AssetDetail/280d31b0-1dd8-b71b-0b35-f870825ebcf3
“Sea lettuce and dead man's rope algae in the harbor outside Havets Hus in Lysekil” by W.carter, licensed under a Creative Commons Attribution License (CC BY-SA 4.0): https://commons.wikimedia.org/wiki/File:Sea_lettuce_and_dead_man%27s_rope_algae_in_the_harbor_outside_Havets_Hus_in_Lysekil_1.jpg
“Xenia umbellata, pólipos pulsantes” by Fernándo Herranz Martín, licensed under a General Public License (GNU GPLv3): https://commons.wikimedia.org/wiki/File:Xenia_umbellata,_p%C3%B3lipos_pulsantes.jpg
“Barnacles” by Rhododendrites, licensed under a Creative Commons Attribution License (CC BY-SA 4.0): https://commons.wikimedia.org/wiki/File:Barnacles_(52285).jpg
“Continental Divide fire” by U.S. National Park Service, public domain: https://www.nps.gov/media/photo/gallery-item.htm?pg=2630261&id=559d967a-67fa-44d1-a306-c95f65efda61&gid=FD4AF7FF-A94D-4A8A-93DB-0EDAD7EF7486
“Fire truck on bridge in the Grant Village campground” by U.S. National Park Service, public domain: https://www.nps.gov/media/photo/gallery-item.htm?pg=2630261&id=1d4f0b99-c09a-419d-8b4e-cba1f494d08f&gid=FD4AF7FF-A94D-4A8A-93DB-0EDAD7EF7486
“Lodgepole pine forest regrowth after 1988 Fire - taken in 2019” by U.S. National Park Service, public domain: https://www.nps.gov/media/photo/gallery-item.htm?pg=2630261&id=541eecfa-348a-47a9-9b07-dea9c22438c9&gid=FD4AF7FF-A94D-4A8A-93DB-0EDAD7EF7486
“Pinus contorta” by Walter Siegmund, licensed under a Creative Commons Attribution License (CC BY-SA 3.0): https://commons.wikimedia.org/wiki/File:Pinus_contorta_28289.JPG
“Lodgepole pine cone after fire” by U.S. National Park Service/Jim Peaco, public domain: https://commons.wikimedia.org/wiki/File:Lodgepole_pine_cone_after_fire.jpg
“USS Buchanan (DDG-14) sinking on 14 June 2000” by U.S. Navy, public domain: https://commons.wikimedia.org/wiki/File:USS_Buchanan_(DDG-14)_sinking_on_14_June_2000.jpg Receive SMS online on sms24.me
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