Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
Community |
a) assemblage of species found in the same area because of similar abiotic requirements b) assemblage of closely linked species locked in by abiotic interactions |
|
|
Trophic structure |
Feeding relationships between organisms •food chain ( 4 or 5 links [trophic levels]) limited by inefficiency of energy transfer along the chain, larger chains more unstable • food chains are hooked together into food webs |
|
|
Dominant species |
Those that have the highest abundance |
|
|
Keystone species |
Important regulating effect on other species |
|
|
Disturbances |
Cause non equilibrium. Often necessary ( forest fires) |
|
|
Stability |
Ability of a community to persist in the face of disturbance |
|
|
Humans |
Most widespread agents of disturbance usually reduce species diversity |
|
|
Ecological succession |
Sequence of community changes after disturbance |
|
|
Primary succession |
Begins in lifeless area where soil has not yet formed |
|
|
Secondary succession |
Occurs where an existing community has been cleared by some event but the soil is still intact |
|
|
Species richness |
The total number of species in the community • tropical habitats support much larger number of species - richness appears to be related to energy availability • richness is also related to size ; the larger the geographic area , the greater the number of species |
|
|
Relative abundance |
Of the different species |
