12_Exotic_SpsSP2008

12_Exotic_SpsSP2008 - Geography 1000 Lecture 12:Exotic...

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1 Lecture 12:Exotic Species Introduced species and their effects on agriculture and other ecosystems Geography 1000 Some terms to Focus on for our test • Story of the Village Weaverbird (p. 91), Rabbits on Philip Island (p. 92), Zebra Mussels (p. 93-94) Kudzu (p. 94), Water Hyacinth (p. 94) • First and Second Generation Pesticides p.414 • DDT story p. 414 BUT continued on 419-420 • Round-up (Glyphosate) and HT crops p. 416 • Bioaccumulation (in a single animal) 419 • Biomagnifications (―up‖ the food chain) p. 420 • Silent Spring and Rachel carson (again) p. 420 • Exotic Species as pest control (!) p. 425 • Pest Control Strategies p. 425-427 (know three) • Snow White Syndrome p. 429. ―Exotic‖ Species is a broad term I will use synonymously with Invasive Species • Definition includes all living organisms which were not ―original‖ to an ecosystem. This is not a very specific definition, but we tend to conceptualize exotics as species which are relatively recent (500 year) arrivals.
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2 It‘s a small world……. • Many North American problems with exotics date from our first significant trade relations with Europe and Asia in the past 120 years (from 1880s). • As global trade increases, we must reasonable expect the inadvertent introduction of more exotics.
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4 $137 BILLION IN DAMAGES BY I.S. IN 2000 Why don‘t WE do something?? • US Customs has not been able to keep up with inspections as trade includes an ever-growing set of nations and regions. • Many exotics are difficult to identify as they ―piggy back‖ on legitimate shipments. Pine borer beetle came with wooden crates and pallets. .. Some Simply Cannot be detected by visual appraisals • Avacados are tasty, BUT at best a domestic avocado costs $.89 each and as high as $1.29. How about imports? • Mexican Imports are restricted due to the Avocado Worm which enters the plant just as the fruit ―sets‖ on the pollinated blossom. The worm lives in the seed and there is no visual mark at maturity
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5 Well, that should be safe. .. • Under the Uruguay Round of the WTO (World Trade Organization) agreement, all restrictions to imports of agricultural products must be dismantled. If the US cannot PROVE that domestic trees will be infected by seeds in markets, the Mexican avocados must be allowed. (Now you can import them into Alaska) What is his point this time. .. • As seems to be the case throughout these lectures, the issue of exotic introductions has economic and political aspects. • If WE refuse the avocados', Mexico retaliates and won‘t import our cars, telecommunications equipment and so on…. .. The Success of Exotic Species • New Introductions often have few natural predators to keep populations in check. • Many more exotics are introduced than
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12_Exotic_SpsSP2008 - Geography 1000 Lecture 12:Exotic...

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