GRIN Verlag, 2007 - 36 pages
Essay from the year 2002 in the subject Biology - Ecology, grade: 1.1 (A), Oxford University (New College), 3 entries in the bibliography, language: English, abstract: Biological invasion happens when an organism, any sort of organism, arrives somewhere beyond its previous range. Nowadays, most invasions come from human actions, deliberate or accidental. But natural invasions happen too, from minor changes of range to major invasions across continents. One reason for studying invasions is that many invasive species have become serious pests. The cumulative losses in the USA from some non-indigenous species were estimated at almost $100 billion by 1991. It has to be noted that most invaders fail and have small effects, but that the cumulative effect of those that succeed has been and will continue to be large. Another important fact is that invasions have been an important component of the evolutionary process throughout geological history. Researchers are therefore not only interested in what makes a successful invader, but also in the ecological as well as the genetic impacts of invasions
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abundance and range affect ecosystem processes akademische Texte allele amensalism Barbary doves become pests beetle biological control Biological Invasions GRIN birds Britain change at invasion Christine Langhoff Biological climatic matching climatic range collared dove Collared doves common starling control agent doves have established ecosystem effects empty niche enemies European evolution example extinctions feral follow invasion forest founder effects genetic changes genetic impacts genetic variation genostasis GRIN Verlag habitat herbivore Hybridisation leading impacts of invasions Increasing the number insect introduced species invasion happens invasion success invasive species Langhoff Biological Invasions lead to invasion marked ecological effects Moorea native biota natural invasion nodules non-target species North America parasites parasitoid partulids pathogens place after invasion plants Polynesian rat population predators predictor propagule pressure rate of increase resource niche ruddy duck ship rat Society Islands success of invasion successful invaders tamarisk taxonomic isolation tens rule tree snails trophic niche white headed duck Zealand zebra mussel