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 studies 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 extensive in scope, exploring details throughout a wide selection of taxonomic teams, trophic degrees, and geographic parts. It examines theoretical issues on the topic of quick evolutionary swap and helps the rising idea that species brought to new actual and biotic environments are fairly at risk of swift evolution. the writer attracts on examples from all elements of the area and all significant surroundings varieties, and the diversity of examples used provides significant perception into the styles of evolution which are more likely to end result from the big advent of species to new geographic areas that's at present happening round the globe.Alien Species and Evolution is the one cutting-edge assessment and synthesis to be had of this seriously very important subject, and is an important paintings for a person focused on the recent technological know-how of invasion biology or the threats posed by means of invasive species.

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

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In some cases, however, they were deliberately added by seed merchants to increase the volume of their seed sales. These forms, known as agroecotypes, are largely restricted to stands of cultivated crops. Agroecotypes are often weedy races of the crop plant itself, with the 22 Basic Concepts of Alien Invasion and Evolution mimicry being enhanced by gene exchanges between crop and weed races. In some cases, the mimicry is largely confined to vegetative similarity, and the weedy plant simply produces and drops seed at or prior to crop harvest.

Two chromosome races of E. These races are essentially restricted to rice fields, although other forms of E. crus-galli occur as weeds outside rice fields. Needless to say, dispersal from their Asian region of origin has been as a contaminant in rice seed. An agroecotype of vetch (Vicia sativa), for example, possesses flattened seeds that mimic those of lentils (Lens esculenta). False flax (Camelina sativa), a member of the mustard family, is a mimic of cultivated flax (Linum usitatissimum). Dispersal by Deliberate Introduction Characteristics that make plants and animals valuable or attractive to humans are, in a sense, preadaptations for their dispersal to new geographical regions.

DNA Fragment Length Polymorphism Analyses DNA fragment length polymorphism analyses are based on the action of restriction enzymes, which cut double-stranded DNA at points where a specific sequence of four to eight nucleotides occurs (Parker et al. 1998). DNA is first extracted from the plant or animal material. One or several restriction enzymes are then used to cut the DNA into fragments. Differences due to nucleotide substitutions, additions, subtractions, or rearrangements may exist within these fragments.

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