an extremely plentiful or oversufficient quantity or supply: an abundance of grain. overflowing fullness: abundance of the heart. affluence; wealth: the enjoyment of abundance. Physics, Chemistry. the number of atoms of one isotope of an element divided by the total number of atoms in a mixture of the isotopes.

A species is considered abundant when it has a high population relative to the size of the area it inhabits. It can also include other measures of performance for plants, animals, or other forms of life in a given area, including number of breeding pairs, population density, and even biomass.

abundance Quick Reference 1 The ratio of the total mass of a specified element in the earth's crust to the total mass of the earth's crust, often expressed as a percentage. For example, the abundance of aluminium in the earth's crust is about 8%.

Abundance is in simplest terms usually measured by identifying and counting every individual of every species in a given sector. It is common for the distribution of species to be skewed so that a few species take up the bulk of individuals collected.

Abundance (species) Definition The total number of individuals of a taxon or taxa in an area, population, or community. Relative abundance refers to the total number of individuals of one taxon compared with the total number of individuals of all other taxa in an area, volume, or community.