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Invasive Species Grant Mulligan

Invasive Species Grant Mulligan. Outline Invasive Birds Invasive Plants Climate Change

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Invasive SpeciesGrant Mulligan

Outline

• Invasive Birds

• Invasive Plants

• Climate Change

House Sparrows

• Ubiquitous in urban areas

• Brought over from Europe

• Kills native bird species actively or passively

• Compete for resources

• Graphic Pictures Follow

"Without question the most deplorable event in the history of American ornithology was the introduction of the English Sparrow."

-W.L. Dawson, The Birds of Ohio, 1903

Invasive Species

• “Are Invasive Species a Major Cause of Extinctions?”

• have negative effects on the functional relationships between birds, their prey, and prey habitat

• Lehmann lovegrass

• Buffelgrass

• Out-compete native species

Invasive Plants

• Invasive exotic plants are a major threat to many species of wild birds.

• Long-term and often irreversible habitat degradation for birds and other animals.

• Overall bird abundance was 32% greater on native-grass sites than on exotic-grass sites (Flanders).

Climate Change

• Becoming a heated policy issue

• Public concern growing• Causing rapid change in

habitats• Extraordinary rate of

species extinction• Potential effects

devastating to ecosystems worldwide.

Climate Change

• There are examples of invasive species altering the evolutionary pathway of native species by competitive exclusion, niche displacement, hybridization, introgression, predation, and ultimately extinction (Mooney).

• Process accelerated by global change brought on by warming

Conclusions

• Must address invasive species problem.

• Must actively manage lands to protect them from invasive species.

• Greater effort to exterminate invasive species

• More education & research needed.

• Limit Global Warming

Works Cited

• Mooney, H. A., and E. E. Cleland. "The Evolutionary Impact of Invasive Species." Proceedings of the National Academy of Sciences of the United States of America 98 (2001): 5446-5451.

• Gurevitch, Jessica, and Dianna K. Padilla. "Are Invasive Species a Major Cause of Extinctions?" Trends in Ecology 19 (2004): 470-474.

• Flanders, Aron A., et al. " Effects of Invasive exotic grasses on south Texas rangeland breeding birds." The Auk 123 (2006): 171-182.

• www.sialis.org/battles.htm (Pictures)