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Transcript of Hurricane Katrina
Saumya Lohia, Vathsalya Senapathi Flora and Fauna Autotrophs (producers):
cypress trees, reeds, water lilies, algae, grass.
Louisanan plants are adpated to the lack of the oxygen, and are called hydrophytics. Heterotrophs (consumers):
Primary consumers: Norway Rat, armadillo, muskrat, grasshopper
Secondary consumers: coyote, red fox
Tertiary consumers: black bear, eastern cougar, bobcats, hawk When Hurricane Katrina hit, it
contaminated all the water by spreading
toxins, sewage, and debris. This killed many organisms,
upsetting many food webs, and so further damaging the ecosystem.
The fish population was also affected, but recovered quickly.
Animal Refuge centers that were stopovers for migratory birds were damaged, leading experts to believe that the birds to find other nesting places. Amphibians: American Alligator, Corn snake, venemous western cottonmouth, pit vipers, speckled king snakes, alligator snapping turtles, anole lizard, and tiger salamanders. Birds: Great Blue Heron, Great Egret, Brown Pelican, Osprey,
Black vulture, and the barred owl. (Migratory birds and waterfowl make stopovers or spend the winter in the wetlands). The hurricane uprooted over 20 million trees, which caused a 10% increase in carbon emissions. The trees couldn't perform photosynthesis, so there was no way to remove some of the carbon dioxide in the atmosphere. Since so many plants got flooded and they died, they couldn't use the nitrates. As a result, the other animals in the ecosystem didn't get their nitrogen. Small plants develop symbiotic relationships in the swamp, usually with fungi.
Mutualism: monarch butterfly and the milkweed plant- both the butterfly and the plant benefit
Commensalism: bee and buttercups (flowers)- the flowers get pollinated and the bees are unaffected
Parasitism: leech and catfish- leech gets food while catfish gets harmed Primary succession- all the plants adapted in the beginning to live in water, because there is less oxygen
Secondary succession- after the hurricane, the plants and other organisms are slowly recovering, but a lot of the marshland is still flooded 1st Trophic Level:
Grass 2nd Trophic Level:
Grasshopper 3rd Trophic Level:
Toad 4th Trophic Level:
Snake 5th Trophic Level:
Dr. John W. Kimball (2004). Food Chains and Webs. Retrieved from
Craig Guillot (August 23, 2006). Hurricane Katrina's Ecological Legacy: Lost
Swamps, Crops, Islands.
(October 2009). Hurricane Katrina’s Impact on the Ecosystem. Retrieved from
Brett Israel (August 6, 2010). 5 Years After Katrina, Gulf Ecosystems On the
Ropes. Retrieved from http://www.ouramazingplanet.com/294-