Endemics


Also found in: Dictionary, Thesaurus, Medical, Legal.
Related to Endemics: Endemic species

Endemics

 

species, genera, families, and other taxonomic units (systematic categories) of plants and animals whose range is limited to a relatively small region.

The range of some endemics is particularly limited. For example, the colubrid Oreotrochilus chimboraso is found only on Mount Chimborazo (South America) at an elevation of 4,000–5,000 m above sea level. The snail Limnaea convoluta occurs only in one small lake in Ireland. Among plants, the Sequoiadendron are found only on the slopes of the Sierra Nevada in California (USA); Pinus eldarica occupies an area of 25–50 sq km on the northern and northeastern slopes of Mount Eyliar-Bug in Soviet Georgia.

Areas that are isolated geographically or ecologically (deep lakes, mountains, islands) are rich in endemics. For example, endemics constitute 75 percent of the fauna of Lake Tanganyika (East Africa), 76 percent of the fauna of Lake Baikal, and 72 percent of the flora of New Zealand. On the Hawaiian Islands endemics constitute 82 percent of the plant species, all of the terrestrial mollusks (400 to 500 species), most beetle species, and almost all of the land-dwelling birds (55 species).

Endemics are divided into two groups—paleoendemics and neo-endemics. (See alsoCOSMOPOLITE, PALEOENDEMIC, and NEO-ENDEMIC.)

REFERENCES

Darlington, F. Zoogeografiia. Moscow, 1966. (Translated from English.)
Tolmachev, A. I. Vvedenie v geografiiu rastenii. Leningrad, 1974.
References in periodicals archive ?
The first encompasses those species that we considered endemic to the archipelago (Appendix 1); the second one records those species that were considered by Correll and Correll (1982) and/or Acevedo-Rodriguez and Strong (2012) as Bahamian endemics but should now not be regarded as part of the endemic flora.
Twenty-four species were delisted due to changes in taxonomy and 28 species were not considered as Bahamian endemics because they occur in other regions (Appendix 2).
Their avifauna is more familiar, and the endemics on both islands are virtually all accessible on a short trip.
The 20 pages devoted to Puerto Rico will get birders onto most of the endemics and near endemics.
The most famous Catalina endemic is Catalina ironwood (Lyonothamnus floribundus), a tree that can reach a height of 30 feet and a spread of 15feet.
Another Catalina endemic of considerable renown is Saint Catherine's lace (Eriogonum giganteum).
In a case study of such endemic vertebrates in a strip of mountainous rain forest in Queensland, just 1[degrees]C of climate warming will deprive them of 65 percent of their core habitat, on average, Williams and his colleagues predict in an upcoming Proceedings of the Royal Society of London B.
For the new study, he considered the region's 65 endemic rain forest species, including ring-tail possums, the golden bowerbird, and microhylid frogs, which skip the tadpole stage.
In this study we provide a review of molecular phylogenies that have included Caribbean Island endemics that are most threatened [E, EN and CR categories of the IUCN (1980,2001) (Fig.
These plates do a wonderful job of illustrating the West Indian endemics and provide some images of the many winter residents on this island; one may still want to bring along a field guide from home to deal with more unusual plumages among these winter residents.
The ironwood - and other endemics like the Catalina mahogany and such shrubs as the yerba santa, Catalina live-forever and Catalina manzanita - are out there for examination, sometimes even clustering close to the few primitive roads that cut across the island.
We anticipate that a number of these lineages will be point endemics restrieted to single locations and as such will represent very high priorities for conservation action.