Population: All the individuals of a species present in an ecosystem
Community: All the organisms present in an ecosystem
Ecological Niche: An organisms role within an ecosystem. Encompasses a species physiology, food source and habitat.
Habitat: Where an organism lives in an ecosystem
Abiotic: Non-living factors
Biotic: Living factors
Ecology: Is the scientific study of the factors which determine the abundance and distribution of organisms
Abundance: Number of individuals of a species found in a given space.
Distribution: Geographical area within which that species can be found
How can you collect a random sample?
Mark out a grid and use a random number generator to calculate co-ordinates this in turn avoids sampling bias. Count the abundance of species at each quadrat and take a relatively large sample allowing it to be representative of the population.
How can you be sure a sample is sufficient?
You can calculate a running mean, at first it will fluctuate however once this narrows your sample size is great enough to be representative of the population.
This is a measure of the proportion of ground occupied by the species, it estimates area covered by that species