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The Biosphere Chapter 3
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What is Ecology?
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Ecology The study of the interactions among organisms and between organisms their environment.
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Biosphere All parts of the Earth where life can exist (land, water and air).
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Biotic vs. Abiotic Biotic: the living factors in an ecosystem Abiotic: the nonliving factors in an ecosystem
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Levels of Organization Ecosystem: interactions among the community and abiotic factors Community: group of interacting populations Population: group of one species living in the same place at the same time Ecosystem: interactions among the community and abiotic factors Community: group of interacting populations Population: group of one species living in the same place at the same time
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Energy, Producers, and Consumers
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Autotrophs An organism that can make its own food. Use photosynthesis or chemosynthesis. Also called producers.
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Heterotrophs An organism that has to get its food from others. Also called consumers.
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Types of Heterotrophs Herbivores: eat only plants Carnivores: eat only meat Omnivores: eat both plants and meat Detritovores: break down dead material; decomposers Scavengers: eat dead animals Herbivores: eat only plants Carnivores: eat only meat Omnivores: eat both plants and meat Detritovores: break down dead material; decomposers Scavengers: eat dead animals
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Energy Flow in Ecosystems
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Feeding Relationships Food chains: less complex Food webs: show all eating relationships in an ecosystem. BETTER! Food chains: less complex Food webs: show all eating relationships in an ecosystem. BETTER!
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Trophic Levels Each step in a food chain. As you move up trophic levels, 90% of the energy is lost.
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Ecological Pyramids Energy Pyramid (kCal) Energy Pyramid (kCal)
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Cycles of Matter
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The Water Cycle
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Nutrient Chemicals an organism needs to sustain life. Carbon Nitrogen Phosphorous Limiting nutrient: the nutrient whose supply limits productivity of producers Chemicals an organism needs to sustain life. Carbon Nitrogen Phosphorous Limiting nutrient: the nutrient whose supply limits productivity of producers
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Carbon Cycle
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Nitrogen Cycle
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Phosphorous Cycle
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Ecosystems & Communities Chapter 4
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Niches & Community Interactions
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Niche Everything an organism does to survive. All physical and biological conditions. What it eats, where it lives (habitat), how it avoids predators, etc. Everything an organism does to survive. All physical and biological conditions. What it eats, where it lives (habitat), how it avoids predators, etc.
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Competition Occurs when two organisms want the same resource at the same time. Competitive Exclusion Principle: No two species can occupy the same niche at the same time. Occurs when two organisms want the same resource at the same time. Competitive Exclusion Principle: No two species can occupy the same niche at the same time.
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Predation An interaction where one organism captures and feeds on another organism. Predator: the “killer” Prey: the “killed” An interaction where one organism captures and feeds on another organism. Predator: the “killer” Prey: the “killed”
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Keystone Species A species that exerts strong control on the structure of a community so that changes to its population causes dramatic changes Ex: sea otters A species that exerts strong control on the structure of a community so that changes to its population causes dramatic changes Ex: sea otters
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Symbiosis Any relationship in which two species live closely together. Mutualism: both species benefit Ex: bees and flowers Commensalism: one species benefits while the other is not affected Ex: barnacles on a whale Parasitism: one species benefits, while the other is harmed Ex: tapeworms- YUK! Examples of Symbiosis Any relationship in which two species live closely together. Mutualism: both species benefit Ex: bees and flowers Commensalism: one species benefits while the other is not affected Ex: barnacles on a whale Parasitism: one species benefits, while the other is harmed Ex: tapeworms- YUK! Examples of Symbiosis
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Succession
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Ecological Succession The series of predictable changes that occur in an ecosystem over time. Primary Succession: occurs where there is no soil 1st: lichens; 2nd: mosses; 3rd tree seedlings appear Ex: after a volcano erupts Secondary Succession: occurs where there is soil Ex: after a forest fire The series of predictable changes that occur in an ecosystem over time. Primary Succession: occurs where there is no soil 1st: lichens; 2nd: mosses; 3rd tree seedlings appear Ex: after a volcano erupts Secondary Succession: occurs where there is soil Ex: after a forest fire
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Climate
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Weather vs. Climate Weather: the day to day condition of the Earth at a particular time and place Climate: the average, year-to-year conditions of temperature and precipitation Weather: the day to day condition of the Earth at a particular time and place Climate: the average, year-to-year conditions of temperature and precipitation
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Effect of Latitude on Climate The tilt of the Earth creates climate zones based on latitude: Polar Temperate Tropical The tilt of the Earth creates climate zones based on latitude: Polar Temperate Tropical
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Heat Transport in the Biosphere Unequal heating of the Earth drives winds and ocean currents. Air and water near the equator heats and rises. Unequal heating of the Earth drives winds and ocean currents. Air and water near the equator heats and rises.
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Ozone Layer Layer of the Earth’s atmosphere (13-20 km above Earth) containing ozone (O 3 ). Absorbs 93-99% of UV light. Layer of the Earth’s atmosphere (13-20 km above Earth) containing ozone (O 3 ). Absorbs 93-99% of UV light.
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The Greenhouse Effect Natural situation where gases trap the sun’s heat energy in the atmosphere. Maintains our climate. (Earth would be 30 ºC cooler without it.) Natural situation where gases trap the sun’s heat energy in the atmosphere. Maintains our climate. (Earth would be 30 ºC cooler without it.)
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Humans in the Biosphere
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Carrying Capacity The maximum number of individuals of a particular species that a particular environment can support.
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Resources Renewable Resource: can be replaced by a healthy ecosystem Ex: trees, wind Nonrenewable Resource: can’t be replenished by natural processes in a reasonable amount of time Ex: fossil fuels Renewable Resource: can be replaced by a healthy ecosystem Ex: trees, wind Nonrenewable Resource: can’t be replenished by natural processes in a reasonable amount of time Ex: fossil fuels
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Biological Magnification Increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain
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Biodiversity All of the organisms in the biosphere Ecological hot spot: a place where significant numbers of species and habitats are in immediate danger of extinction All of the organisms in the biosphere Ecological hot spot: a place where significant numbers of species and habitats are in immediate danger of extinction
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Conservation “wise use” studying the loss of biodiversity & ways it can be prevented “wise use” studying the loss of biodiversity & ways it can be prevented
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Ecological footprint The total area of functioning land and water ecosystems needed to provide resources and absorb the wastes of an individual or population. Used to calculate the biosphere’s carrying capacity for humans. The total area of functioning land and water ecosystems needed to provide resources and absorb the wastes of an individual or population. Used to calculate the biosphere’s carrying capacity for humans.
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