A measure of both species abundance and species richness. An area that has a large number of species and many representative individuals from each species is more diverse than an area that has only a single species.
the variance of distinct species that are found in an assemblage community, or sample.
A function of the distribution and abundance of species. Approximately synonymous with species richness. In more technical literature, includes considerations of the evenness of species abundances. An ecosystem is said to be more diverse, according to the more technical definition, if species present have equal population sizes and less diverse if many species are rare and some are very common.
a measure of the number of individual species and their relative abundance in an area
The number of different species within a defined area (sample, patch, area, assemblage, ecological community, or larger area); also known as species richness.
A measure of the number and relative abundance of species (see biodiversity).
the variety of different organisms in a given area
The number and relative abundance of species present in a community.
The number and variety of species found in a given area in a region.
An ecological concept that incorporates both the number of species in a particular sampling area and the evenness with which individuals are distributed among the various species.
the variety of species in a sample, community, or area.
The number of species within a community of organisms. Areas of high diversity are characterized by a great variety of species. A biological community with high diversity is better capable of withstanding environmental disturbances. Pollution tends to reduce biological diversity.
In this context, this term refers to an index of a biological community's diversity that takes into account both species richness (i.e., the number of species present) and evenness (i.e., whether the abundance of species is equitably distributed throughout the community).
Number of different species and their relative abundances in a given area. See biodiversity. Compare ecological diversity, genetic diversity.
The number of different species living in a certain place. Species diversity is naturally higher in the Amazon rainforest than it is in the Arctic tundra. This does not refer to the number of individuals of a species. Two thousand cattle in a pasture may show very low species diversity. Two cows, two sheep, and two goats in the same pasture triple its species diversity.
A species is a group of plants or animals that are so similar that they can breed together and produce fertile offspring. Species diversity refers to the variety of species within a geographical area or ecosystem.
The diversity of species in a higher taxon or a particular place; the middle, most familiar level of biological diversity.
