Download Alien Species and Evolution: The Evolutionary Ecology of by George W. Cox PDF

By George W. Cox

In Alien Species and Evolution, biologist George W. Cox stories and synthesizes rising details at the evolutionary alterations that take place in vegetation, animals, and microbial organisms once they colonize new geographical parts, and at the evolutionary responses of the local species with which alien species interact.The publication is wide in scope, exploring info throughout a large choice of taxonomic teams, trophic degrees, and geographic parts. It examines theoretical themes regarding speedy evolutionary swap and helps the rising idea that species brought to new actual and biotic environments are really susceptible to fast evolution. the writer attracts on examples from all components of the realm and all significant atmosphere kinds, and the diversity of examples used supplies substantial perception into the styles of evolution which are prone to end result from the large creation of species to new geographic areas that's at the moment taking place round the globe.Alien Species and Evolution is the single state of the art assessment and synthesis on hand of this seriously very important subject, and is an important paintings for someone focused on the recent technological know-how of invasion biology or the threats posed by way of invasive species.

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Additional info for Alien Species and Evolution: The Evolutionary Ecology of Exotic Plants, Animals, Microbes, and Interacting Native Species

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S. state, including Alaska and Hawaii. It has proven to be a highly invasive plant in open habitats throughout western North America. In semiarid regions of the Columbia Plateau and Great Basin, cheatgrass invasion leads to increased wildfire frequency that can transform sagebrush steppe to pure stands of cheatgrass. One can hardly imagine a more successful invader. Allozyme analyses of cheatgrass plants from 60 sites across North America reveal little overall genetic variability (Novak et al. 1991a).

Intro- 2. Adaptation of Alien Species for Dispersal and Establishment 23 ductions for forestry and horticulture become important somewhat later and have continued to the present. These percentages are likely to be low because the manner of introduction of 31–37% of naturalized species could not be determined with certainty. For Hawaii, about 57% of naturalized species were deliberately introduced (Wester 1992). Since 1900, the percentage of naturalized plants that were deliberately introduced has tended to be even higher in many areas, including the United States,Australia, and New Zealand (Mack and Erneberg 2002).

New island populations tend to be founded by seeds likely to be carried farthest by wind. Once established on islands, selection favors lower tendency to be carried far by wind, since this increases the chance that seeds will be blown off the island. The curved arrows indicate the most likely patterns of dispersal. The dashed arrows indicate the influence of natural selection on dispersability and the thick arrows indicate stages in the evolutionary sequence. (Reprinted with permission from M. L.

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