c5 - Non-Native Species Non-Native Species Terms:...

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Non-Native Species
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Non-Native Species Terms: Introduced, Exotic, Invasive Introduced for food, fiber, pharmaceutical ,and ornamental reasons Most not successful in in natural ecosystems Lack of dispersers and mutualists Not resistant to herbivores, disturbance regimes, etc. Those that escape may or may not become invasive 5,000 plant species have escaped and now exist in U.S. natural ecosystems ( Morse et al ., 1995) 50,000 invasive plant and animal species are established in the U.S.
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Characteristics of Success Asexual Reproduction and self compatibility: Plants Allelochemicals r-selected Absence of natural predators Absence of parasites or pathogens Good dispersal
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General Impact of Invasive Species US Cost ~$138 Billion in damage and loss each year Crowd out native plants and wildlife that depend on them Disrupt ecosystem processes; hydrology, natural succession, and pollination Cause soil erosion and change soil chemistry Create additional fire hazard
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Cogongrass ( Imperata cylindrica )
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This note was uploaded on 02/12/2011 for the course BSC 2008 taught by Professor Blohm during the Spring '08 term at University of Florida.

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c5 - Non-Native Species Non-Native Species Terms:...

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