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14 Cards in this Set
- Front
- Back
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What is a weed? |
A species that occurs in an area that it is not wanted |
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What is an invasive plant? |
A species that has the capacity to easily colonize or become established in an area and subsequently displace other species |
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What are exotic or non-native species? |
Species that do not naturally occur in a specific area |
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What are some of the impacts of invasive plants? |
1. Ecosystem effects like altering hydraulic Cycles 2. Habitat dominance and displacement of native plants 3. Economic impacts to Agriculture and Horticulture 4. Economic impacts on the environment |
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What makes non-native invasive successful? |
1. Originated from places with similar climates 2. Evolved in areas with a long history of disturbance 3. Inherited traits |
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California has what climate? |
Mediterranean |
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What is the climate of a Mediterranean environment? |
A long dry drought period And a long cool wet period |
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What are other areas with a Mediterranean climate? |
West coast of Chile, the Mediterranean area, Cape Town region of South Africa, Western and Southwestern Coast of Australia |
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What are some invasive species traits? |
1. Fast growth 2. High reproduction rates 3. Seed or fruit dispersal 4. Long-term seed viability 5. General-purpose genotype (wide range of tolerances) |
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What is competitive advantage? In California |
Many exotic annual weed species start germinating in late winter but many Native annual species may not germinate until March or later so by the time many Native annual species are starting to germinate they are already competing with non-natives that are adults |
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What are some disturbance factors? |
1. Disturb communities are easier to invade than undisturbed communities 2. Disturbance removes individuals, opens up space and resources |
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What are some examples of disturbances? |
Natural disturbances like floods, fires, volcano, landslide. Or human-caused disturbance like grading, habitat conversion, converting one Community to another |
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What is competitive exclusion? |
The exclusion of one species by another when they both compete for a common resource that is in limited Supply |
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How can some plants have an advantage in competitive exclusion? |
When they can quickly colonize, they arrived first at the scene, or they earlier in the season then their competitors |
