Definition: diameter of the cross section of a burrow in soil, sediment or rock, presumed to represent a measure of body size of the burrow occupant, orthogonal to length (~body depth or width)
Definition: The marine benthic biome (benthic meaning 'bottom') encompasses the seafloor and includes such areas as shores, littoral or intertidal areas, marine coral reefs, and the deep seabed.
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)