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bIO 46
DSFASFGAFG
32
Biology
8th Grade
02/15/2015

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Term
EUTROPHICATION
Definition
NUTRIENT ENRICHMENT OF AN AQUATIC ECOSYSTEM
Term
consumer
Definition
organism that gets energy and nutrients by feeding on tissues, wastes, or remains of other organisms, a heterotroph.
Term
decomposer
Definition
organism that feeds on biological remains and breaks organic material down into its inorganic subunits
Term
detritivore
Definition
consumer that feeds on small bits of organic material
Term
ecosystem
Definition
a community interesting with its environment
Term
food chain
Definition
description of who eats whom in one path of energy flow in an ecosystem
Term
primary producer
Definition
in an ecosystem, an organism that captures energy from an inorganic source and stores it as biomass: first trophic level
Term
trophic level
Definition
position of an organism in a food chain
Term
detrital food web
Definition
food web in which most energy is transferred directly from producers to detritiovres
Term
food web
Definition
set of cross-connecting food chains
Term
grazing food web
Definition
food web in which most energy is transferred from producers to grazers (herbivores)
Term
biomass pyramid
Definition
diagram that depicts the biomass (dry weight) in each of an ecosystems trophic levels.
Term
energy pyramid
Definition
diagram that depicts the energy that enters each of an ecosystems trophic levels. lowest tier of the pyramid, representing primary producers, is always the largest
Term
primary production
Definition
the rate at which an ecosystems producers capture and store energy
Term
aquifer
Definition
porous rock layer that hold some groundwater
Term
groundwater
Definition
soil water and water in aquifers
Term
runoff
Definition
water that flows over soil into streams
Term
soil water
Definition
water between soil particles
Term
water cycle
Definition
movement of water among earths atmosphere, ocean,and the freshwater reservoir on land.
Term
watershed
Definition
land area that drains into a particular stream or river.
Term
biochemical cycle
Definition
a nutrient moves among environmental reservoir and into and out of food webs
Term
atmospheric cycle
Definition
biogeochemical cycle in which a gaseous form of an element plays a significant role.
Term
carbon cycle
Definition
movement of carbon, mainly between the oceans, atmosphere, and living organisms.
Term
global climate change
Definition
a long-term change in earths climate
Term
greenhouse gas
Definition
atmospheric gas that absorbs heat emitted by earths surface and remits it, thus keeping the pant warm
Term
ammonification
Definition
breakdown of nitrogen-containing organic material resulting in the release of ammonia and ammonium ions
Term
denitrification
Definition
conversion of nitrous or nitrous to gaseous forms of nitrogen
Term
nitrification
Definition
conversion of ammonium to nitrates
Term
nitrogen cycle
Definition
movement of nitrogen among the atmosphere, soil, and water, and into and out of food webs.
Term
nitrogen fixation
Definition
incorporation of nitrogen from nitrogen gas into ammonia
Term
phosphorus cycle
Definition
movement of phosphorus among earths rocks and water and into and out of food webs
Term
sedimentary cycle
Definition
biochemical cycle in which the atmosphere plays little role and rocks are the major reservoir
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