EEB202H1 Lecture Notes - Lecture 7: Eichhornia Crassipes, Echinochloa, Herbicide

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2 types of disturbance: anthropogenic - caused by humans, natural. Pampas grass invasion in cali introduced to america from argentina as ornamental plants. Common attributes of successful invasive species rapid development to reproduction high reproduction output broad ecological tolerance reproduction is the key well developed dispersal mechanisms. 150 years ago from the east -> spread -> gone further and much more common in the west. S: delay flowering and in large size evolution by natural selection has resulted in local adaptation. Aquatic plant invasion in the tropics how do we control them? putting herbicide in water is not a smart move - would cause pollution of aquatic habitats so biological control methods are used. Water hyacinth it was restricted to lowland south america about 150yrs ago (tropical & warm temperate areas) Kariba weed compete with water hyacinth no sex this plant"s a hybrid that was produced accidentally by crossing of other species.

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