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Jetcheva filipova kalpakov raynova 10 4 inv species
 

Jetcheva filipova kalpakov raynova 10 4 inv species

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    Jetcheva filipova kalpakov raynova 10 4 inv species Jetcheva filipova kalpakov raynova 10 4 inv species Presentation Transcript

    • Invasive Species Human Impact on Ecosystems Filipova, Teodora Jetcheva, Laura Kalpakov, Peter Raynova, Ema Section 10/4
    • Invasive species 1
      • Non-native (alien) to the specific ecosystem
      • Introduction harms/ is likely to harm economics, the environment and/or human health
      • Plants, animals, and other organisms (e.g. microbes)
      • Primarily introduced by human actions
    • Ecological problems 4,7
      • Vectors for new diseases
      • Alter ecosystem processes
      • Change biodiversity (exclude native species)
      • - can create monocultures
      • Disrupt cultural landscapes
      • - native species become extinct – their niche is used by the invasive species
    • Economic problems 4
      • Reduce the value of land and water for human activities
      • - a lot of food and money are lost each year because of lost crops
      • E.g. Areas with abundant invasive species can more easily erode during a flood
      • E.g. Weeds provide less streamside cover
      • - increase stream temperature
    • Methods of introduction 2
      • Unintentionally by people traveling
      • Shipping
      • Pets released into the wild
      • Through exchange of different materials (e.g. wood can carry insects)
    • Preventing introduction 2
      • Preventing spread after introduction is very difficult once the species has begun to establish
      • Better knowledge of the risks introduction may impose
      • Legislation and regulations for purposeful introduction of invasive species
    • Actions after introduction 3
      • Early detection
      • Quick response – all methods are very expensive and difficult to carry out
      • E.g. Farmers spray against, cut and mow invasive weeds in their fields
    • Rattus norvegicus (Brown rat) 4
      • Location
        • Native to the South East of Siberia, North of China, and Hondo region (Japan)
        • Beginning of 18 th century – introduced in all continents except Antarctica
        • Continuing introduction to islands
      http://www.europe-aliens.org/images/factsheetMaps/28_ratnor.jpg http://www.scientific-web.com/en/Biology/Animalia/Chordata/Mammalia/RattusNorvegicus01.html
    • Cause 4
      • Synanthropic species (=ecologically associated with humans)
      • Maritime and terrestrial traffic
        • Trade between central Asia and northern European countries
        • Ships with timber from England and Norway
        • Migration to the Americas
      • Decreases populations of small mammals, birds, and reptiles due to competition
      • Reservoir and vector of disease (hepatitis E)
      • High expenses for controlling its population
      • Capture via traps
      • Chemical poisoning (toxic baits)
      Impact and Solutions 4
    • Angiopteris evecta (Giant Fern)
      • Location
      • - Abundant in Hawaii, Costa Rica, and Jamaica
      • Name
      • - A type of fern; named ‘giant’ because of its big leaves
      http://caribbean-direct.com/ http://www.wellgrowhorti.com/page/landscapeplants/Ferns%20&%20Allies/Fern%20List%20A.htm
    • Cause 5
      • People use it for ornamenting and thus, grow it deliberately
      • Natural dispersal of the plant
      • Its seeds are often dispersed by the wind
    • Impact and Solutions 5
      • Especially problematic on islands where there are many endemics and relatively disturbed forests
      • There is a restriction for cultivation and trade of angiopteris evecta
    • Works Cited
      • &quot;What Is an Invasive Species?&quot; National Invasive Species Information Center. Web. 14 Dec. 2010. <http://www.invasivespeciesinfo.gov/whatis.shtml>.
      • Rissanen, &quot;Introduction of Invasive Species | EHow.com. Web. 14 Dec. 2010. <http://www.ehow.com/about_5509361_introduction-invasive-species.html>.
      • InvasiveSpecies.gov . Web. 14 Dec. 2010. <http://www.invasivespecies.gov/index.html.>.
      • DAISIE - Home. Web. 14 Dec. 2010. <http://www.europe-aliens.org/>.
      • &quot;Issg Database: Ecology of Angiopteris Evecta.&quot; IUCN/SSC Invasive Species Specialist Group (ISSG). Web. 14 Dec. 2010. <http://www.issg.org/database/species/ecology.asp?si=1550&fr=1&sts=&lang=EN>.
      • &quot;Rattus Norvegicus.&quot; Scientific-web. Web. 14 Dec. 2010. <http://www.scientific-web.com/en/Biology/Animalia/Chordata/Mammalia/RattusNorvegicus01.html>.
      • &quot;Invasive Plants & Weeds | City of West Linn Oregon Official Website.&quot; Home Page | City of West Linn Oregon Official Website. Web. 14 Dec. 2010. <http://westlinnoregon.gov/parksrec/invasive-plants-weeds>.