Key Area 2: Distribution of Organisms Flashcards
Examples of human activity that decrease biodiversity
Invasive species
Increased pollution
Indicator species
Species by their presence or absence indicate environment quality/ levels of pollution
Biotic factor
Interactions between living components of an ecosystem
Examples of Biotic factors
Comp for resources
Disease
Food availability
Predation
Grazing
Abiotic factor
Physical elements of the environment that affects biodiversity
Examples of Abiotic factors
Light intensity
Moisture
pH
Temperature
How to measure Light intensity
Use a light meter, don’t overshadow the meter with your body
How to measure Moisture
Use a moisture meter, wipe probe between samples.
A source of error when using a quadrat.
Not placing it randomly
Source of error when using a pitfall trap
Not digging the hole so the cup is level with the ground
Not covering so bugs can fly in
Sampling techniques
Pitfall trap and quadrats
Temperature
Thermometer or temp probes. Wipe the probe between each sample
pH
pH meter or chemical test. wipe probe between samples.
Biodiversity
The total variation of living things on earth or within an ecosystem
Grazing
Method of feeding by which a herbivore eats grasses and herbs
