Bio 201 F09 Lowry lect 39 (L39) invasion

Bio 201 F09 Lowry lect 39 (L39) invasion - Introduced...

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1 Introduced species • New equilibrium or • Shiva to natural communities ? "On a global basis. ..the two great destroyers of biodiversity are, first habitat destruction and, second, invasion by exotic species” - E.O. Wilson WEED EXOTIC ~ ALIEN ~ NON-NATIVE INVASIVE NOXIOUS
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2 What makes a species invasive? Invasible Ecosystems • Disturbed areas • Ports of entry • Community disruption/ low diversity What makes a species invasive? • Natural Enemies Hypothesis: plants leave enemies behind; are better competitors • Biotic Resistance Hypothesis: native pathogens prevent new plants from establishing Purple loosestrife
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3 Water Hyacinth (Eichhornia crassipes) • Ecosystem Level Impacts - Disturbance regimes (like fires) - Hydrology - erosion, sedimentation - Soil chemistry, nutrients • Community and Population Level Impacts - Vegetation structure - Community composition - Resource competition - Negative impacts on native animals - Promotion of non-native invasive animals - Population reductions, eliminations
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This note was uploaded on 03/22/2010 for the course BIO 200 taught by Professor Stone during the Spring '10 term at SUNY Stony Brook.

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Bio 201 F09 Lowry lect 39 (L39) invasion - Introduced...

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