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27 Cards in this Set
- Front
- Back
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the study of the interactions of living organisms with one antoher and with their environment
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ecology
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place where a particular population of species lives
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habitat
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the many different species that live together in a habitat
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community
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ecological system encompassing a community and all the physical aspect sof its habitat
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ecosystem
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physical aspects of a habitat
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abiotic factors
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living organisms in a habitat
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biotic factors
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the variety of species living within an ecosystem
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biodiversity
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small, fast-growing plants that are the first organisms to live in new habitat
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pioneer species
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succession that occurs in a newly formed habitat that has never before sustained life
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primary succession
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an episode of succession that occurs in areas where there has been previous growth, such as abandoned fields or forest clearing
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secondary succession
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the amount of organic material that the photosynthetic organisms of an ecosystem produce
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primary productivity
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organism that makes its own food from energy and carbon atoms in its enviornment; autotrophs
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producer
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organism that must obtain energy to build its molecules by consuming other organims; heterotrophs
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consumer
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a group of organisms that have the same source of energy; a step in food chain
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trophic level
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linear pathway of energy transfer in an ecosystem
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food chain
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organism that eats only plants or algae
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herbivore
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flesh-eating organism
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carnivore
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animal that eats both plants and animals
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omnivore
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organism that obtains its energy by feeding on dead organisms or wastes
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detritivore
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organism that causes decay
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decomposer
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a network of interconnected food chains in an ecosystem
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food web
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diagram that depicts each trophic level in an ecosystem and how much energy is stored in each trophic level
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energy pyramid
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the dry weight of tissue and other organic matter found in a specific ecosystem
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biomass
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cycle in which a substance such as carbon or water enters into an environments living reservoir where it remains for a certain period of time and is returned to nonliving reservoir
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biogeochemical cycle
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water found beneath Earth's surface
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ground water
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loss of water from a plant through its stomata
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transpiration
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process of combining nitrogen gas with hydrogen to form ammonia
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nitrogen fixation
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