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Unit 11: Ecology and the Environment

front 1

Ecology

back 1

The study of ecosystems or how organisms interact with each other and their environment.

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Biosphere

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Largest level or organization. The zone of life on earth that includes all living things.

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Population

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A group of the same species of individuals living in the same area and interacting with each other in some way.

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Community

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Populations of different species that live in a specific location.

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Ecosystem

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A community or group of organisms living and interacting with other and their environment (non living factors)

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Exponential Growth

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Unchecked reproduction of a population of organisms. Occurs when each individual in a population reproduces, the offspring reproduce, and then the offpring of the offspring reproduce.

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Carrying Capacity

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The largest population that a given ecosystem can support at any time. It is determined by the availability of resources.

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Biotic Factors

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Living things or things associated with or the result from the activities of living organisms in an ecosystem.

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Abiotic Factors

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Nonliving thing in an ecosystem such as rocks, soil, climate, etc.

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Trophic Level

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A producing or feeding level in a food chain.

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Producer

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1st trophic level in organization. Plants and other photosynthetic organisms that produce glucose (converts sun energy into chemical energy). Also known as autotroph.

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Food Chain

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The pathway along with food/energy is transferred from one organism to another.

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Food Web

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Shows flow of energy in all of the interconnected food chains in an ecosystem.

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Consumer

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An organism that eats other organisms or are heterotrophs.

  • Primary consumer - herbivores, eats producers
  • Secondary consumer - eats primary consumers
  • Tertiary consumer - eats secondary consumer

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Keystone Species

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Species that plays a key role in maintaining ecosystem stability.

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Biome

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A large area dominated by characteristic plants and animals, such as a rain forest, desert, or tundra. Determined by participation and temperature. It is the broadest level of ecological classification within the biosphere.

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Biodiversity

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The variety of species and total number of individuals of each of species living in a defined area. An important indicator in how healthy and well-functioning an ecosystem is.

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Limiting Factors

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Limits the potential for a population to grow exponentially due to the availability of resources such as food, water and predators.

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Heterotroph

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Organisms that eat other organisms for energy. Also known as consumers.

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Autotroph

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Organisms that produces its own food either by photosynthesis or chemosynthesis. Also known as a producer.

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Aquatic Ecosystem

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An ecosystem in water - can be marine (saltwater) or freshwater ecosystems.

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Terrestrial Ecosystem

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Ecosystem found on land. 6 main types:

  • Tundra
  • Taiga
  • Temperate Deciduous forest
  • Tropical Rain Forest
  • Grassland
  • Desert

front 23

Ecological Pyramid

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A graphical model that is shaped like a pyramid to show how the energy flows through a food chain.

front 24

Energy Pyramid

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A graphical representation of the total amount of chemical energy present at each trophic level of an ecosystem.

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10% rule

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Used to explain energy flow in energy pyramids. In each trophic level, 90% of the available energy is used by that level and 10% moves up to the next level when they are eaten.

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Primary Succession

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The change in species composition in a defined area over time, starting on ground that has no living things on it.

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Pioneer Species

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First plants or animals to inhibit bare land.

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Succession

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When ecosystems change over time through the progressive replacement of species.

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Secondary Succession

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Changes in plant and animals life in an established ecosystem, can only occur after an ecosystem is in place.

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Climax Community

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A stable, long-lasting community that results from succession.

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Non native species

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Organisms that have invaded established ecosystems and disturbs the balance of the ecosystems. Also known as invasive species.

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Water Cycle

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How water is stored and moved between land, air, and living things.

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Condensation

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Part of water cycle where water vapor condenses into liquid water by clinging to dust or other small particles suspended in the atmosphere, forming clouds

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Evaporation

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Part of the water cycle where liquid water changes to water vapor due to heat from the sun.

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Transpiration

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Part of the water cycle where a plant loses water to the atmosphere through the surface of its leaves.

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Respiration

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Processes in which organisms exchanges gases with its environment. Part of the water cycle because animals exhale water vapor into the air during respiration.

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Decomposer

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Organisms, such as bacteria and fungi, that consume very small bits of organic matter from dead organisms and breaks them down into chemicals that are recycled back into the environment.

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Symbiosis

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The relationship between two different kinds of living things that live together and depend on each other. Three kinds:

  • Mutalistic
  • Parasitic
  • Commensalistic

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Mutalism

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Type of symbiosis where both organisms in the relationship benefit.

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Parasitism

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Type of symbiosis where one organism benefits (parasite) at the expense of the other (host).

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Commensalism

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Type of symbiosis where one organism benefits and the other is not affected.

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Nitrogen Cycle

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Cycle where nitrogen changes into different chemical forms. Atmosphere is largest reservoir of nitrogen, but is not useable so it needs to be converted into useable forms for organism.

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Nitrogen Fixing

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Conversion of nitrogen gas into ammonia and nitrates by bacteria. Bacteria form symbiotic relationship with plants to provide usable nitrogen for plants.

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Denitrification

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The conversion of nitrate to gaseous nitrogen by bacteria, which then enters the atmosphere. These bacteria use nitrogen compounds instead of oxygen for their processes of respiration.

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Carbon Cycle

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Processes that recycle carbon, one of the most important elements on earth, between earth's soil, atmosphere, and organisms.

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Oxygen Cycle

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Processes that cycle of oxygen between air, land, and organisms.

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Renewable Resources

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Resources that regenerate or regrow fast enough for us to keep using them. Ex: radiant energy, livestock, wind and water.

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Nonrenewable Resources

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Resources which either cannot be renewed at all or take such a long time to renew that people cannot depend on the renewal. Ex: oil and fossil fuels.

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Greenhouse Effect

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The process in which the atmosphere reflects radiation bouncing off earth's surface.

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Greenhouse gases

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Gasses in the atmosphere which trap radiant energy, such as carbon dioxide. Increased greenhouse gases are thought to be causing global warming.

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Pollution

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The presence of harmful materials in the environment.

front 52

Competition

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An interaction between organisms or species, in which fitness of one is lowered by the presence of another

front 53

Predation

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Where a predator feeds on a prey. Population size of the predator affect the population size of the prey and vise versa.