Invasive species toto todor elena
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Transcript of Invasive species toto todor elena
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Invasive Species – A Threat to the EnvironmentTodorTotoElena10/1
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What are Invasive Species? (4, 6)
A broad term
Definition – “a species of animals or plants non-native to an environment in which their numbers are growing rapidly “
May be used for native species
Poison hemlock (US)
http://upload.wikimedia.org/wikipedia/commons/b/b2/Conium.jpg
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Alien Species (1, 4)
“Alien species” & “Invasive species” - not interchangeable!!!
Alien species that doesn’t do harm - Introduced
Example: Goldfish (on picture) http://jerkmag.files.wordpress.com/2009/10/goldfish3.jpg
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Characteristics of Invasive Species (4, 6)
Grow rapidly
Common species – extinct
Food chain
Chain reactions - catastrophic to economies and habitats http://danceswithflowers.files.wordpress.com/2009/08/ipresents.jpg
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Ecological Problems Caused by Invasive Species (6)
Remove natural controls → other species flourish
Extinction
Genetic pollution
Both animal and plant species are threatened
http://imghost.indiamart.com/data/1/P/MY-978044/poultry-chicken_250x250.jpg
http://www.birding.in/images/Birds/red_junglefowl.jpg
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Economic Problems Caused by Invasive Species (6)
Rapid decline in tree populations
Large amounts of crops destroyed
Damage to fish industries
Damages are often worth billions of dollars
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Methods of Introduction (7)
Intentional - purposefully brought by humans, usually for profit
Accidental - a species “hitchhiking” onto a man-made vessel and traveling to another environment
Red foxes:introduced to Alaska to help fur trade
http://www.wildnatureimages.com/images%203/Red-Fox-Road..jpg
Killer bees: accidentally made their way into Brazil
http://www.thinkrabies.com/killerbee.jpg
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Dealing With Invasive Species (1, 8)
Identification and location
Once identified → removed with pesticides
Harder and more costly to remove
Poisoning, hunting, or transportation out of the area
Social awareness and involvement
Removing harmful vines
http://www.watershedactivities.com/projects/summer/media/vineremoval3.jpg
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Examples of Invasive Species (2)
Canada Goose (Branta Canadensis)
Description
Native range
Introduced range
http://www.cwsd.org/images/canadagoose.jpg
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Genetic pollution of Greylag Goose
Feeds on valuable crops
Kills and diminishes small fowl populations
Droppings - environmental hazard
Often collides with aircrafts
http://www.europe-aliens.org/images/factsheetMaps/31_bracan.jpg
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Examples of Invasive Species (3, 9)
Canadian Waterweed (Elodea canadensis)
Description
Native range
Introduced range
http://www.shorelineweedcontrol.com/images/weeds/waterweed.jpg
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Outnumbers native plants
An obstacle for fishing, swimming, boating, water skiing
Attempts to remove it by blocking sunlight, poisoning, and introducing species that eat it
http://www.europe-aliens.org/images/factsheetMaps/61_elocan.jpg
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Sources & Bibliography1. "Alien Species ". Southern Crossroads. June 5, 2010
<http://southerncrossroads.info/capeoffire/alien-mug-shots-know-the- enemy/>. 2. “Canada Goose”. Delivering Alien Species Inventories for Europe. June 5, 2010
<http://www.europe-aliens.org/speciesFactsheet.do?speciesId=50357#>.
3. “Canada Waterweed” . Delivering Alien Species Inventories for Europe. June 5, 2010
<http://www.europe-aliens.org/speciesFactsheet.do?speciesId=1052#> .
4. "DAISIE". Delivering Alien Species Inventories for Europe. June 5, 2010 <http://www.europe-aliens.org>.
5. "Explore Your Watershed". Carson River Watershed. June 5, 2010 <http://www.cwsd.org/images/canadagoose.jpg>.
6. "Global Invasive Species Database ". Invasive Species Specialist Group. June 5, 2010 <http://www.issg.org/database/welcome/>.
7. "Invasive ". Center for Invasive Species and Ecosystem Health. June 5, 2010 <http://www.invasive.org>.
8. "Invasive Species Information Center". Natural Agricultural Library. June 5, 2010 <http://www.invasivespeciesinfo.gov/>.
9. "Shoreline Weed Control ". Shoreline Weed Control. June 5, 2010 <http://www.shorelineweedcontrol.com/images/weeds/waterweed.jpg>.