A self contained area including the biotic (living) community and abiotic (non-living) components interacting with one another

Two examples of biotic factors that affect the population size of an organism

Differences between organisms of the same species

The study of inter-relationships between organisms & their environment This environment includes living (biotic) factors (e.g. competition & predation) & non-living (abiotic) factors (e.g. temperature & rainfall).

This describes how an organism fits into the environment. It describes what a species is like, where it occurs, how it behaves, its interactions with other species and how it responds to its environment.

A line along which organisms can be sampled in ecological studies. Particularly useful in ecosystems such as sea shores and sand dunes where abiotic conditions and species vary across the area being studied.

all of the organisms of one species in an ecosystem

competition between organisms of DIFFERENT species e.g. for food

The place where an organism lives

Conditions in the environment that limit population size - these can be biotic or abiotic factors.

Where one organism is consumed by another

When using a quadrat to estimate population size, we take many samples to ensure that our data is what?