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Ecology The study of the interactions of organisms with one another and their surroundings
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Organism Any living thing
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Ecosystem Community of organisms (living things) that live in a certain area
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Includes Living and Non-living surroundings
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Living Things and the Environment
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Biotic Surroundings Living Surroundings Other animals and plant life
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Abiotic Surroundings Non-Living Surroundings Rocks, Water, Sunlight, Dirt
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Energy Roles Each organism in an ecosystem fills a role
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Three Roles 1.Producer 2.Consumer 3.Decomposer
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Producers Plants Chlorophyll (Green) Photosynthesis
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Consumers Feed on other organisms
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Herbivores – Eat Plants Carnivores – Eat Animals
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Omnivores – Eat both Plants and Animals
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Decomposers Found in the Dirt Break Down dead material
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Include mushrooms, earthworms, pillbugs, and bacteria
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PRODUCERS 1 ST LEVEL CONSUMERS 2 ND LEVEL CONSUMERS Energy Pyramid Decomposer
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Energy Pyramids Shows the amount of energy that moves from one level to the next
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The most energy is available at the bottom (producer level), and has less energy as you move up
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General Rule…. Only 10 PERCENT of the energy is transferred to the next level.
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Why? 90 % of the energy has already been used by the organism in order to survive. (Grow, breed)
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Construct an Energy Pyramid Grass, Fungi, Lion, Zebra
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Grass Zebra Lion Ecosystem Fungi
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Construct an Energy Pyramid Catepillar, Bird, Earthworm, Leaf
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Leaf Catepillar Bird Ecosystem Earthworms
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Food Chain
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Food Chains A series of events in which one organism eats another and obtains energy
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Food Chains show only ONE possible path
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Example Tree Caterpillar Bird
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Food Webs
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Consists of the many possible paths of obtaining food in an ecosystem (area)
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More Realistic, since many producers and consumers are part of many food chains
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First – Level Consumers Feed on the Producers
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Second – Level Consumers Eats the first – level Consumers
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Predator and Prey Interactions
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Predator The organism that goes in for the kill
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Prey The organism that dies
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Example A shark kills a fish Predator Shark Prey Fish
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Adapting to the Environment
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Natural Selection A characteristic that makes an organism better suited to its environment
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ADAPTATIONS Cactus – Sharp spines
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Types of Adaptations Mimicry Protective Covering False Coloring Camouflage Warning Coloring
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Camouflage Blending into the environment
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Mimicry Copy Cat looks and acts like another species or object.
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False Coloring
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Environmental Change
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Some animals change due to environmental changes (SEASONAL changes)
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Arctic Fox WINTER
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Arctic Fox SUMMER
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Predator - Prey Interactions On Isle Royale, an island in Lake Superior, the populations of wolves (the predator) and moose (the prey) rise and fall in cycles. Use the graph to answer the questions. Interactions Among Living Things
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Predator - Prey Interactions Reading Graphs: –What variable is plotted on the x- axis? What two variables are plotted on the y- axis? –Year; numbers of wolves and moose Interactions Among Living Things
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Predator - Prey Interactions Interpreting Data: –How did the moose population change between 1965 and 1972? What happened to the wolf population from 1973 through 1976? –The moose population increased and then decreased; the wolf population increased. Interactions Among Living Things
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Predator - Prey Interactions Inferring: –How might the change in the moose population have led to the change in the wolf population? –As the moose population increased, more food was available to the wolf population and it increased. Interactions Among Living Things
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Predator - Prey Interactions Drawing Conclusions: –What is one likely cause of the dip in the moose population between 1974 and 1981? –The wolf population increased. Interactions Among Living Things
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Predator - Prey Interactions Predicting: –How might a disease in the wolf population one year affect the moose population the next year? –Disease would cause a decrease in the wolf population, so fewer moose would be eaten and the population could increase. Interactions Among Living Things
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