Download Conservation by Proxy: Indicator, Umbrella, Keystone, by Tim Caro, Sheila Girling Ms. PDF

By Tim Caro, Sheila Girling Ms.

The substantial scope of conservation difficulties has pressured biologists and bosses to depend upon "surrogate" species to function shortcuts to steer their choice making. those species-known through a bunch of other phrases, together with indicator, umbrella, and flagship species-act as proxies to symbolize better conservation matters, similar to the site of biodiversity hotspots or normal atmosphere health. Synthesizing a huge physique of literature, conservation biologist and box researcher Tim Caro deals systematic definitions of surrogate species options, explores organic theories that underlie them, considers how surrogate species are selected, severely examines proof for and opposed to their software, and makes techniques for his or her persevered use. The bookclarifies terminology and contrasts how varied phrases are utilized in the true worldconsiders the ecological, taxonomic, and political underpinnings of those shortcutsidentifies standards that make for solid surrogate speciesoutlines the conditions the place the appliance of the surrogate species notion indicates promiseConservation by way of Proxy is a benchmark reference that offers transparent definitions and customary realizing of the proof and concept at the back of surrogate species. it's the first publication to study and convey jointly literature on greater than fifteen kinds of surrogate species, allowing us to evaluate their function in conservation and delivering instructions on how they are often used such a lot successfully. (20110508)

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Extra info for Conservation by Proxy: Indicator, Umbrella, Keystone, Flagship, and Other Surrogate Species

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1998). Interestingly, endemic mammals, categorized in the same way, constitute about 25 percent of mammals. Globally, endemic bird and endemic mammal areas correspond well (Balmford & Long 1995). Applying the definition to amphibians incorporates as many as 60 percent of amphibians, and areas containing two or more endemic amphibians correspond very closely to those of birds and mammals (see Figure 2-3). One study that incorporated endemism to identify global hotspots has received a good deal of attention.

These threatening processes are unlikely to be coincident. On continents, the most renowned study to date used species listed under the Federal Endangered Species Act throughout the United States, including all species, subspecies, and populations proposed for listing up to August 1995—a total of 924 species in 2858 counties (Dobson et al. 1997). These were then assigned to each county in the continental United States and Hawaii. Counties housing endangered plants are centered on southern California; those harboring endangered birds are found across the continent but especially in Florida and west of the Mississippi; endangered fish in the southwest, Mississippi Valley, and southeastern coastal states; and mollusks in Appalachia (see Figure 2-4).

Thus, the more species recorded in a taxon, the greater the proportion of threatened species will be documented. Similarly, in areas where studies have been more intensive, there should be more species recorded as threatened or extinct (McKinney 1999). Witness mollusks, crustaceans, and insects that are poorly studied at a global scale; they have up to two orders of magnitude fewer threatened species than mammals, whereas on the betterstudied continents, nations, or regions, proportions of species that are threatened match those of mammals.

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