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Endemism

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Title: Endemism  
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Subject: Charles Hose, List of Odonata species of South Africa, Tehachapi Mountains, Amphibians/DYK, Upper Neretva
Collection: Biodiversity, Biology Terminology, Endemism, Habitat
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Endemism

The orange-breasted sunbird (Nectarinia violacea) is exclusively found in fynbos vegetation.

Endemism is the indigenous to a place are not endemic to it if they are also found elsewhere. The extreme opposite of endemism is cosmopolitan distribution. Another term for a species that is endemic is precinctive, which applies to species (and subspecific categories) that are restricted to a defined geographical area. A native species, such as a native plant, is one that is considered to have been endemic for a relatively long period of time.

The word endemic is from New Latin endēmicus, from Greek ενδήμος, endēmos, "native." Endēmos is formed of en, "in," and dēmos, "the people."[1] An alternative term, precinctive, has been suggested by some scientists,[1] and was first used by MacCaughey in 1917. It is the equivalent of ‘endemism’.[2] Precinction was perhaps first used by Frank and McCoy.[3][4] Precinctive seems to have been coined by David Sharp of the Hawaiian fauna:[5] "I use the word precinctive in the sense of 'confined to the area under discussion' … 'precinctive forms' means those forms that are confined to the area specified." That definition excludes artificial confinement of examples by humans in far-off botanical gardens or zoological parks.

Contents

  • Overview 1
  • Threats to highly endemistic regions 2
  • Notes 3
  • References 4
  • Further reading 5

Overview

Physical, climatic, and biological factors can contribute to endemism. The orange-breasted sunbird is exclusively found in the fynbos vegetation zone of southwestern South Africa. The glacier bear is found only in limited places in Southeast Alaska. Political factors can play a part if a species is protected, or actively hunted, in one jurisdiction but not another.

There are two subcategories of endemism: paleoendemism and neoendemism. Paleoendemism refers to species that were formerly widespread but are now restricted to a smaller area. Neoendemism refers to species that have recently arisen, such as through divergence and reproductive isolation or through hybridization and polyploidy in plants.

Endemic types or species are especially likely to develop on geographically and biologically isolated areas such as islands and remote island groups, such as Hawaii, the Galápagos Islands, and Socotra; they can equally develop in biologically isolated areas such as the highlands of Ethiopia, or large bodies of water far from other lakes, like Lake Baikal.

Endemics can easily become Bermuda petrels and "Bermuda cedars" (actually junipers) in Bermuda when it was settled at the start of the seventeenth century. By the end of the century, the petrels were thought extinct. Cedars, already ravaged by centuries of shipbuilding, were driven nearly to extinction in the twentieth century by the introduction of a parasite. Bermuda petrels and cedars are now rare, as are other species endemic to Bermuda.

Threats to highly endemistic regions

Principal causes of habitat degradation and loss in highly endemistic ecosystems include agriculture, urban growth, surface mining, mineral extraction, logging operations[6][7] and slash-and-burn agriculture.

Notes

  1. ^ Precinctivity

References

  1. ^ "Endemic". Reference.com. Retrieved 6 december 2014.
  2. ^ MacCaughey, Vaughaun 1917. A survey of the Hawaiian land flora. Botanical Gazette 64: 89-114 [see p. 92]. http://www.jstor.org/stable/2469367
  3. ^ Frank, J.H. and McCoy, E.D. 1990. Endemics and epidemics of shibboleths and other things causing chaos. Florida Entomologist 73: 1-9. http://journals.fcla.edu/flaent/article/view/58577/56256
  4. ^ Frank, J.H. and McCoy, E.D. 1995. Precinctive insect species in Florida. Florida Entomologist 78: 21-35. [also uses word precinction]. http://journals.fcla.edu/flaent/article/view/74657/72315
  5. ^ Sharp, D. 1900. Coleoptera. I. Coleoptera Phytophaga, p. 91-116 in D. Sharp [ed.]. Fauna Hawaiiensis, Being the Land-Fauna of the Hawaiian Islands. Cambridge Univ. Press; Cambridge, vol. 2 part 3 [see p. 91].
  6. ^ Fred Smiet (1982). Threats to the Spice Islands. Oryx, 16 , pp 323-328 doi:10.1017/S0030605300017774
  7. ^ "Frontiers in Ecology and the Environment 5". p. 25–32. 

Further reading

  • Juan J. Morrone (1994). "On the Identification of Areas of Endemism" (PDF). Systematic Biology 43 (3): 438–441.  
  • CDL Orme, RG Davies, M Burgess, F Eigenbrod; et al. (18 August 2005). "Global hotspots of species richness are not congruent with endemism or threat". Nature 436 (7053): 1016–9.   Category:CS1 maint: Explicit use of et al.)
  • JT Kerr (October 1997). "Species Richness, Endemism, and the Choice of Areas for Conservation" (PDF). Conservation Biology 11 (55): 1094–1100.  
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