Populations in ecosystems - Yr 2 Flashcards
Ecosystem
Self-contained unit made up of the biotic and abiotic factors in an area
Population
A group of organisms of the same species occupying a particular space at a particular time that can potentially interbreed.
Community
The organisms of all species that live in the same area
Habitat
The place where an organism normally lives
Niche
All the conditions and resources required for an organism to survive and reproduce (its ‘role’)
Random Sampling
Sampling a population to eliminate bias e.g. grid square and co-ordinates
Systematic Sampling
Regular sampling across an area e.g. along a straight line transect
Mark-Release-Recapture
Method of estimating population size of animals (number in first sample x number in second sample) / marked animals in second sample
Abiotic Factors
Concerned with the non-living part of the environment
Biotic Factors
Concerned with the living organisms in the environment
Interspecific Competition
Competition between organisms of different species
Intraspecific Competition
Competition between organisms of the same species
Succession
The changes in an ecosystem, over time, of the species that occupy it
Pioneer Species
A species that can colonise bare rock or ground
Climax Community
The stable, final, community that exists in a balanced equilibrium that makes up the final stage of succession. Abiotic factors are more or less constant over time.
