BIOC63H3 Lecture 8: BIOC63Fall2013 Lecture 8 Notes.docx
18 Nov 2013
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Selective pressure for mechanical and chemical plant defense. Decrease biodiversity forms cheat grass monocultures cheatgrass also changes biochemical characteristics within the ecosystem. Er eica no evolution, no change evolutionary adaptation to new conditions introduced range er versus eica native range plant introduction no herbivore/pathogen introduction o garlic mustard. #1 terrestrial invasive species in canada others include common buckthorn, glossy buckthorn, and leafy spurge introduced in 1860 from europe often dominant understory herb in forests and flood plains. Invasive ecosystem engineers: highly competitive, affect many species in an ecosystem, can affect soil/water nutrient balance, often open ecosystems to more invaders, so far only a few" native species have become extinct due to invasive ones. Summary of effects of invasive speies: mcdonaldization of local flora/fauna, wherever you go in the world they are present and the same. Queen anne"s lace this plant is not a real threat but it is still very abundant throughout the world: an increase in invasive species.
