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10 Cards in this Set
- Front
- Back
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conservation
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allowing the use of resources in a responsible manner
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preservation
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setting aside areas and protecting tem from human activities
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keystone species
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species whose role in an ecosystem are more important than others (sea otters, sea stars, grizzlybears, prairie dogs)
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indicator species
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species that serve as early warnings that an ecosystem is being damaged ex. trout
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characteristics of endangered species
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small range, large territory, or live on an island
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endangered species
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a group of organisms in danger of becoming extinct if the situation is not improved; population numbers have dropped below the critical number of organisms; North spotted Owl (loss of old growth forest), Bald Eagle (thinning of eggs caused by DDT), Piping Plover (nesting areas threatened by development), and many others
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invasive/alien/exotic species
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non-native species to an area; often thrive and disrupt the ecosystem balance
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parts of the hydrologic cycle
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evaporation, transpiration, runoff, condensation,precipitation, infiltration
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nitrogen fixing
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because atmospheric N2 cannot be used directly by plants it must first be converted into ammonia(NH3) by bacteria (rhizobium or cyanobacteria)
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ammonification
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nitrogen is converted into ammonia by ammonifying bacteria; may occur when nitrogen in organic wastes in the soil are converted to ammonia or when atmospheric nitrogen(N2) is converted to NH3
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