Abundance (ecology)
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Abundance is an ecological concept referring to the relative representation of a species in a particular ecosystem. It is usually measured as the large number of individuals found per sample. How species abundances are distributed within an ecosystem is referred to as relative species abundances.
Abundance is contrasted with, but typically correlates to, incidence, which is the frequency with which the species occurs at all in a sample.[1] When high abundance is accompanied by low incidence, it is considered locally or sporadically abundant.
A variety of sampling methods are used to measure abundance. For larger animals, these may include spotlight counts, track counts and roadkill counts, as well as presence at monitoring stations.[2]
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[edit] References
- ^ Bartelt, Gerald A.; Rolley, Robert E.; Vine, Lawrence E. (2001). Evaluation of abundance indices for striped skunks, common raccoons and Virginia opossums in southern Wisconsin (Research report (Wisconsin. Dept. of Natural Resources), Report 185). Madison, Wisconsin: Wisconsin Dept. of Natural Resources, Bureau of Integrated Science Services. http://digicoll.library.wisc.edu/cgi-bin/EcoNatRes/EcoNatRes-idx?type=turn&entity=EcoNatRes004508080004&isize=M. Retrieved on 2006-12-15.
- ^ Wright, David Hamilton (July 1991). "Correlations Between Incidence and Abundance are Expected by Chance". Journal of Biogeography 18 (4): 463–466. doi:. http://links.jstor.org/sici?sici=0305-0270(199107)18%3A4%3C463%3ACBIAAA%3E2.0.CO%3B2-7. Retrieved on 2006-12-15.
