Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Ecosystem Test Stack

Anything that photosynthesizes is called a producer
A rabbit or mouse is an example of a primary consumer
The top predator in an ecosystem would be called a tertiary consumer
The snake that eats the mouse is a secondary consumer
bacteria or fungi that break down organic material and replenish nutrients to the soil decomposer
detritus feeders or detrivores feed on waste or dead bodies ex)vulture
prectentage of usable chemical energy that is transferred a biomass from one trophic level to the next. ecological efficiency
biomass dry weight of organic matter contained in organisms. transferred from 1 trophic level to the next.
gross primary productivity (GPP) rate at which an ecosystems producers convert solar energy into chemical energy. usually measure in kcal/m2/yr.
net primary productivity (NPP) rate at which an ecosystems producers convert solar energy into chemical energy minus (-)rate at which they use some of this stored chemical energy for respiration. (NPP= GPP-R)
NPP is greatest... where there is more solar radiation available or in bodies of water where there is a large nutrient flow
humans have intervened in this cycle by cutting down forests and burning fossil fuels carbon cycle
a key component of nature's thermostat is carbon
Most of out atmosphere is nitrogen
bacteria and blue-green algae convert N2 to NH3 (ammonia)and then to ammoniumn ions for the plants nitrogen fixation
nitrification ammonia is converted to nitrites (NO2-) and then nitrates (NO3-). This process naturally occurs in the environment, where it is carried out by specialized bacteria.
bacteria in moist environments convert NH3 and NH4+ back into nitrate ions and then into N2 and N20 gases denitrification
We intervene in the nitrogen cycle by burning fossil fuels and contributing to acid deposition, by added nutrients from livestock waste and fertilizer to soil that also runs off into bodies of water
This nutrient doesn't cycle through atmosphere Phosphate
Sulfur enters the atmosphere naturally by active volcanoes, anaerobic (does not need O2) decomposers in swamps, sea spray, dust storms and forest fires
Humans have added sulfur to the atmosphere by burning coal with sulfur for electricity, refining petroleum to make gasoline, smelting mineral ore into metal. All of this releases sulfur compounds into atmosphere and then it comes back to the surface in acid rain.
a positive feedback loop is a change further in the same direction in a system.sometimes referred to as vicious cycles,"A produces more of B which in turn produces more of A".
a change in a system in the opposite direction negative feedback loop
species only found in 1 area are endemic species
species richness # of species within a community
species evenness abundance of individuals found within a species
characteristics of r-selected species or r-strategists tend to have many, usually small offspring with little or no parental care required. tend to be opportunistic species. examples: bacteria, rodents, frogs, insects
characteristics of K-selected species or K-strategists reproduce later in life with few offspring, with long life spans. offspring are large, and usually require parental care. they are competitive species.
indicator species provide warning of damage to a community or ecosystem. examples: fish, birds, butterflies, amphibians (read more on 93-95)
keystone species have a huge effect on the abundance of other species in an ecosystem...remove them and an ecosystem can collapse. ex) pollinators, top predators
a species that shapes communities by creating and enhancing their habitats to benefit other species foundation species ex)alligators, elephants, beavers
non-native species are often successful because usually have no natural predators,competitors, parasites or pathogens in new niche to control their population size
Created by: sallywentzell