By George W. Cox
In Alien Species and Evolution, biologist George W. Cox studies and synthesizes rising details at the evolutionary alterations that happen in vegetation, animals, and microbial organisms after they colonize new geographical components, and at the evolutionary responses of the local species with which alien species interact.
The ebook is wide in scope, exploring info throughout a large choice of taxonomic teams, trophic degrees, and geographic components. It examines theoretical subject matters regarding speedy evolutionary switch and helps the rising idea that species brought to new actual and biotic environments are really susceptible to swift evolution. the writer attracts on examples from all elements of the realm and all significant surroundings varieties, and the diversity of examples used provides substantial perception into the styles of evolution which are prone to consequence from the big creation of species to new geographic areas that's presently happening round the globe.
Alien Species and Evolution is the single cutting-edge evaluation and synthesis to be had of this seriously vital subject, and is an important paintings for an individual all in favour of the hot technological know-how of invasion biology or the threats posed through invasive species.
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Extra info for Alien species and evolution
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). 6% of the loci examined were polymorphic in individual populations. Furthermore, in a sample of more than 2,000 individuals, no individual was found to be heterozygous for any of 25 genetic loci. Analyses of microsatellite markers, a somewhat more sensitive indicator of variability, from four locations in Utah and Nevada revealed 15 different genotypes (Ramakrishnan et al.
This plant produces root exudates that inhibit the growth of perennial bunchgrasses in North America, although not of related Eurasian bunchgrasses. Similarly, herbivores and predators that invade island areas previously free of such animals encounter plants and prey lacking adaptations to avoid their easy exploitation. A number of other correlations exist with respect to invasive plants, although these do not yet give a clear indication of an underlying adap- 2. Adaptation of Alien Species for Dispersal and Establishment 27 tive mechanism.
Many of these species introductions were truly inadvertent, their seeds being accidentally included because of inadequate techniques of seed cleaning. 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.