ecology and ecosystems advanced biology montgomery high school
TRANSCRIPT
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Ecology andEcosystems
Advanced Biology
Montgomery High School
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What is Ecology?
• Study of how organisms interact with each other and their physical environment.
• Fundamental unit is the “ecosystem”– Vary in size– Composed of biotic (living) and abiotic
(nonliving) material– May be terrestrial (land) or aquatic (water)
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Terrestrial ecosystems are called biomes.
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African Savanna
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Rain Forest
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Wetlands
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Tundra
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Desert
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Washington State:Rain Shadow
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Aquatic Ecosystems
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Oceanic Ecosystems
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Trophic levels = energy flow
• Producers make food from sunlight.
• Consumers eat others to get their energy.– Herbivores eat plants– Carnivores eat “meat”– Omnivores eat everything (plant and animal)– Decomposers eat dead things (plant and
animal) and release the nutrients bound up in their bodies for reuse.
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Food Web
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Energy Flow
ThroughTrophic Levels
•Energy is lost at each step in an ecosystem
•From one trophic level to another, the transfer of energy is not 100% efficient. “10% rule”
•Energy is lost when it is converted to unusable heat at each step.
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Ecological Pyramids:Energy
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Ecology
• Materials cycle within ecosystems:
– Water cycle.
– Carbon cycle.
– Nitrogen cycle.
– Phosphorus cycle.
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Water Cycle
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Carbon Cycle
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Nitrogen Cycle
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Phosphorus Cycle
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Interaction of organisms
• Symbiosis: two or more organisms live together in more or less permanent relationships.
– Commensalism.
– Mutualism.
– Parasitism.
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Commensalism
• Clownfish and sea anemone, Coral Sea, Australia
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Mutualism
• Ants and aphids.
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Parasitism
• Ectoparasites:– Lice, animal parasite.– Dodder, plant parasite.
• Endoparasites:– Tapeworm, animal parasite.
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Predator-Prey Interactions
• Plant defense systems:
– Toxic or repellent chemicals.
• Animal defense systems:
– Coloration.
– Chemical.
• Predator-prey cycles.
• Mimicry: Monarch vs. Viceroy butterflies.
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Community Stability
• Ecological succession:
– Primary succession.
– Secondary succession.
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Biodiversity = Species Richness
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Threats to Biodiversity
•Loss of habitat (increased human population)
•Pollution
•Introduction of non-native species
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Biomagnification of DDT in a Food Chain