2. Distribution of Organisms Flashcards
Biotic and abiotic factors
Can increase or decrease the biodiversity of an ecosystem
Biotic factors are
Factors relating to living things
Abiotic factors are
Non-living factors
Examples of biotic factors
Competition, disease, grazing, predation and food availability
Examples of abiotic factors
Light intensity, pH, temperature and moisture
Sampling is used to
Estimate the size of a population of an organism in a habitat or ecosystem
Techniques used when sampling plants and animals
Quadrats, pitfall traps and transect lines
Equipment used to measure abiotic factors
Light meter, moisture meter, pH meter and thermometer
All sampling techniques have
Sources of error
Branched and paired statement keys can be used to
Identify organisms
Indicator species are
Species by which their presence or absences indicates environmental quality/levels of pollution
Examples of indicator species
Lichen and freshwater invertebrates
