Create an account
consists of all the organisms living in a community as well as all the abiotic factors with which they interact; can range from a microcosm like an aquarium to a large area such as a lake or a forest
important group of heterotrophs; consumers that get their energy from detritus
nonliving organic material, such as the remains of dead organisms, feces, fallen leaves, and wood
the amount of light energy converted to chemical energy by autotrophs during a given time period
gross primary production (GPP)
the amount of light energy that is converted to chemical energy by photosynthesis per unit time
net primary production (NPP)
equal to gross primary production minus the energy used by the primary producers for respiration
the element that must be added in order for production to increase in a particular area
a process in which phytoplankton communities that had been dominated by diatoms or green algae became dominated by cyanobacteria
the annual amount of water transpired by plants and evaporated from a landscape, usually measure in millimeters
the amount of chemical energy in consumers' food that is converted to their own new biomass during a given time period
the percentage of production transferred from one trophic level to the next. Trophic efficiencies must always be less than production efficiencies because they take into account not only the energy lost through respiration and contained feces, but also the energy in organic material in a lower trophic level that is not consumed by the next trophic level
green world hypothesis
terrestrial herbivores consume relatively little plant biomass because they are held in check by a variety of factors, including predators, parasites, and disease
a process when toxins become more concentrated in successive trophic levels of a food web
process that retains some of the solar heat when CO2 and water vapor intercept and absorb much of the reflected infrared radiation, re-reflecting some of it back toward Earth
the conversion of N2 by bacteria to forms that can be used to synthesize nitrogenous organic compounds
the process in which denitrifying bacteria under anaerobic conditions use NO3- (nitrate) in their metabolism instead of O2 (oxygen) releasing N2
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together