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Biology Quizlet #24

15 terms quater 4

TermDefinition
climax community A stable, mature community that undergoes little or no change in species over time
keystone species A species that influences the survival of many other species in an ecosystem
indicator species Species that serve as early warnings that a community or ecosystem is being degraded.
nutrient chemical substance that an organism needs to sustain life
biogeochemical cycle process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another
nitrogen fixation process of converting nitrogen gas into nitrogen compounds that plants can absorb and use
eutrophication A process by which nutrients, particularly phosphorus and nitrogen, become highly concentrated in a body of water, leading to increased growth of organisms such as algae or cyanobacteria.
atmosphere The layer of gases surrounding Earth
geosphere the solid part of the earth consisting of the crust and outer mantle
hydrosphere All the water at and near the surface of the earth, 97% of which is in oceans
ecological succession the predictable replacement of one group of species by another group of species over time
primary succession An ecological succession that begins in an area where no biotic community previously existed
secondary succession Succession following a disturbance that destroys a community without destroying the soil
pioneer species First species to populate an area during primary succession
biosphere part of Earth in which life exists including land, water, and air or atmosphere
Created by: rathburn74
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