ecosystems intro - december 2010
TRANSCRIPT
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EcosystemsEcosystemsCommunities interact with their environmentCommunities interact with their environment
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Living things don’t just interact with each other in a community.
cc licensed flickr photo by jfortugaleza: http://flickr.com/photos/30594175@N05/3230112383/
They also interact with the non-living components of their
environment
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Ecosystem - an area in which a community interacts with its non-living
environment
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Two components of an ecosystem:
biotic - living (i.e. the community)abiotic - non-living
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Matter within an ecosystem is recycled in biogeochemical cycles.
cc licensed flickr photo by lanier67: http://flickr.com/photos/lanier67/184302007/
pathway through which a chemical element or substance moves through both biotic and abiotic components
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Evaporation - liquid water absorbs heat to become water vapour
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Condensation - water vapour in air condenses into tiny liquid water droplets
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Evapotranspiration - water evaporates from the leaves of plants
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Sublimation - solid ice/snow turns directly into gaseous water vapour.
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Precipitation - water droplets in air fall to surface of earth as liquid rain or solid snow/hail.
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Infiltration - liquid water seeps into soil to become groundwater
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Discharge - groundwater drains into rivers or lakes
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Storage - water can remain for extended periods in underground reservoirs called aquifers.