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Setting priorities for conservation.



44 percent of all vascular plant vascular plant
 or tracheophyte

Any plant that has a specialized conducting system consisting mostly of phloem (food-conducting tissue) and xylem (water-conducting tissue), collectively called vascular tissue.
 species and 35 percent of all terrestrial vertebrate species appear to be confined to be in childbed.

See also: Confine
 to just 25 "hotspots," which cover only 1.4 percent of the Earth's land surface, according to according to
prep.
1. As stated or indicated by; on the authority of: according to historians.

2. In keeping with: according to instructions.

3.
 a paper published in the 24 February 2000 issue of Nature. "Biodiversity Hotspots for Conservation Priorities," written by a team of five ecologists, finds that these hotspots are all under a high degree of threat, so protecting them presents a major opportunity for a highly targeted, global conservation effort.

The authors define a hotspot as an ecologically distinct bioregion bi·o·re·gion  
n.
An area constituting a natural ecological community with characteristic flora, fauna, and environmental conditions and bounded by natural rather than artificial borders.
 that meets two criteria. First, it must be biologically rich, containing at least 0.5 percent (or 1,500) of the world's vascular plants (Bot.) plants composed in part of vascular tissue, as all flowering plants and the higher cryptogamous plants, or those of the class Pteridophyta. Cf. Cellular plants, under Cellular.

See also: Vascular
 as endemics--that is, as species native only to the area concerned. (Some 90 percent of the world's flora consists of "vascular" plants--plants that have internal "plumbing.") Second, the region must have suffered loss of at least 70 percent of the original vegetation--a strong indication that surviving habitat is under severe pressure. Animal endemics were not used to define the hotspots, but the authors surveyed endemic fauna to determine the degree of overlap between plant and animal diversity, and to aid comparison of the hotspots themselves. The 25 hotspots are the sole surviving ranges of 29 percent of the world's birds, 27 percent of mammals, 38 percent of reptiles, and 53 percent of amphibians amphibians

members of the animal class Amphibia. Includes frogs, toads, newts, salamanders and cecilians all capable of living on land or in water.
. (These percentages refer only to endemics; the hotspots also contain many species of both animals and plants that are not endemic to them.)

Of the 25 hotspots, 15 are tropical. Nine are made up largely or entirely of islands--and virtually all tropical islands Tropical Islands Resort is an artificial tropical resort in Brandenburg, Germany. It is said to be the world's largest tropical indoor pool which can accommodate up to 7,000 visitors a day. It is also the world's largest Indoor Waterpark at 66,000 m² (710,000 sq feet).  are included in one hotspot or another. The hotspots vary in size from the surviving original cover of the entirety of southeast Asia Southeast Asia, region of Asia (1990 est. pop. 442,500,000), c.1,740,000 sq mi (4,506,600 sq km), bounded roughly by the Indian subcontinent on the west, China on the north, and the Pacific Ocean on the east.  and central America, to the 2,000 square kilometers of forest remaining along the eastern Kenya-Tanzania border.

Although the analysis is still limited--it doesn't include invertebrates, for example, or marine vertebrates--the authors argue that it is comprehensive enough to justify a substantial expansion of the original hotspots conservation strategy. That strategy, launched in 1989. was based solely on plant diversity "hotspots" and has attracted some $400 million in funding over roughly a decade. The current paper argues for increasing the level of finding to $500 million annually for the next five years--a tiny fraction of the $300 billion annually that a comprehensive global conservation program would probably cost.
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Author:Bright, Chris
Publication:World Watch
Article Type:Brief Article
Geographic Code:1USA
Date:Jul 1, 2000
Words:406
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