Lecture-4-invasives

2007 23 zebra mussel detected in great lakes in 1986 o

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Unformatted text preview: Inten8onal introduc8on   Currently o  Popula8ons established over most of North America o  Displaces na8ve species, especially cavity nesters o  No efforts at control 1890 introduction Current distribution 21 Gypsy moth   E8enne Leopold Trouvelot in 1869 o  Brought gypsy moth from Europe to Massachusejs to build a bejer silkmoth o  Accidental introduc8on   Currently o  Popula8ons established over much of eastern North America •  Significant defolia8on of oak forests •  Eradica8on abandoned; “Slow the Spread” o  Frequent introduc8ons to western North America •  Rigorous eradica8on programs •  Insec8cide applica8ons – Vancouver, Victoria 22 Gypsy moth   Flightless females   Generalist   Spread o  Human transport From Liebhold et al. 2007 23 Zebra mussel   Detected in Great Lakes in 1986 o  Na8ve to Caspian Sea (Russia) o  Ship’s ballast o  Accidental introduc8on   Currently o  Popula8ons established over much of eastern North America o  Outcompetes and suffocates many na8ve species o  Blocks water intakes for municipal supplies and hydroelectri...
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