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Ecosystems Part 2

limiting factors, food chains, food webs, populations, communities, and roles of organisms

Ali Strickland

on 12 September 2011

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Transcript of Ecosystems Part 2

All organisms need energy to live and grow which is obtained from food. The role an organism has in an ecosystem can be described by the way it gets its energy. Producers Organisms that are able to use light energy from the sun to produce food from carbon dioxide in air and water. Consumers Organisms that cannot make their own food, so they must eat plants and/or other animals. Herbivores Animals that eat only plants Carnivores Animals that eat only animals Omnivores Animals that eat both plants and animals Decomposers Consumers that get the energy they need by breaking down dead or decaying matter Maggots Fungi Termites Hippopotamus Koala Sheep Horse Tortoise Hyena Polar Bear Shark Cheetah Venus Fly Trap Vulture Monkey Panda Racoon Pig Food Webs Interconnected food chains Grassland Food Web Ocean Food Web Organism Interaction Predator Prey animals that hunt and kill other animals for food animals that are hunted and killed as food for other animals Parasite Host an organism that spends a significant portion of its life in or on a living host organism, usualy causing harm to the host without immediately killing it organisms or cells that serve as a home or source of food for a parasite Limiting Factors A condition or resource that keeps a population at a certain size. If any of the limiting factors change, aminal and plant populations may also change. The relationship between numbers of organisms and the resources available in an ecosystem is often described as the balance of nature. Some changes may cause a population to increase; others may cause a population to decrease. Increase Decrease If there are more plants than usual in an area, animal populations that eat the plants may increase. If the population of prey increases, the population of predators will also increase because of the availability of food. If the water supply in an area decreases, the population that needs the water may decrease. Then the population of animals that eat that animal could decrease. If trees are cut down of die because of disease or parasites, the population of the animals that use the trees for food or shelter will decrease. If organisms no longer have enough space to survive, they will either have to move or will die. Thischange in space may be due to human influences or natural hazards. People If organisms no longer have enough space ot survive, they will either have to move or will die. This change in space may be due to human influences or natural hazards.
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