Lecture 04 2010

Lecture 04 2010 - Methods of introduction of invasive...

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Methods of introduction of invasive plants • Accidental – seed contaminants – hitchhiker on clothing, equipment, tools – ballast – packing materials
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Methods of introduction of invasive plants • Intentional – aquarium trade – ornamental – erosion control – food or medicinal plant – forage species
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Route of introduction into California 0 5 10 15 20 25 30 35 40 45 50 Percentage of species Seed or other contaminant Ornamental Dye, medicinal, forage Aquarium Intentional introductions California 63% Based 199 invasives on Cal-IPC list Accidental introductions
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Types of plants that can be invasive • Aquatic • Herbaceous – annuals – perennials – vines – parasitic – epiphytic • Woody – shrubs – trees
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Growth form of invasive plants 0 20 40 60 80 100 120 140 160 180 200 Number of species Woody Herbaceous biennials and perennials Vines Winter annuals Summer annuals Total annuals 16% 43% 2% 24% 16% 39%
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Habitat of known invasive species Riparian-12% Wetland-10% Aquatic-4% Dunes-3% Forest/Woodlands/Scrublands-34% Rangelands/Grasslands-37%
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Impacts of invasive plants • Forage quality and quantity – livestock and wildlife • Livestock or human health • Plant and animal diversity – natives or endangered species • Increased fire threat • Erosion and drought • Flood control • Interfere with recreation
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Lecture 04 2010 - Methods of introduction of invasive...

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