Ecosystem and Distribution Flashcards
Memorize
Range of species which exists within an ecosystem
Biodiversity
where organisms live
Habitat
Total number of one type of organisms in an ecosystem
population
all the living things in an ecosystem
community
role of an organism plays in the ecosystem
niche
interaction between living and non-living parts of the ecosystem
ecosystem
factors affecting the distribution of species
- food
2. human interaction
abiotic factors
- pH
- carbon dioxide
- light intensity
- temperature
- rainfall
- air humidity
biotic factors
- disease
- competition
- availability
- grazing
a small representative part of the complete habitat
sample
examples of valid samples
- several samples
- samples must be random
- samples must be taken by identical apparatus
limitations of using quadrat
- careful swing
ways to reduce errors of using quadrat
- place quadrat randomly
sources of errors using pitfall traps
!. few samples
- animals drown
- animals avoid it
- carnivores eat other animals
ways that errors can be reduced (pitfall trap)
- Many samples
- Holes to escape
- camouflage
sources of error (moisture meter)
- inaccurate or no reading
2. Pointer still moving
ways that errors can be reduced (moisture meter)
- Insert probe to same depth and remove soil from probe between readings
- wait until pointer stops moving
sources of errors (light meters)
- light meter could be shadowed
2. light intensity can change at different times of the day
ways to reduce errors (light meter)
- hold it away from user
2. take readings at the same time if the day
