Why are invasive species successful?
Good question......
Species that are confined to a given area naturally have prey and predators, and their proportions have been balanced by millenia of evolutionary history. Introduce a species to a new area, for instance rabbits or prickly pear to Australia, or rats to urban areas, or the Kudzu vine to North America, these introduced species have no predators that have been adapted to control their populations.
The introduction of rabbits to Australia is a case in point. The native ecology had no wolves or foxes to control the population (foxes are another introduced species in Australia but these tend to prey on native animals), and rabbit populations exploded (they say in the 50's and 60's large swathes of Australia turned into a dustbowl because of rabbit population). The solution? The introduction of the myxomatosis virus, which was non-native to Australia. Of course, this control measure could have gone wrong in unexpected ways.
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A number of characteristics give invasive species a competitive advantage over native species, such as higher reproductive rates, aggressive behavior, or tolerance to environmental stressors. In addition, human activities like global trade and transportation often facilitate the spread of invasive species to new areas. Invasive species are successful because they can reproduce quickly, adapt to a variety of environments, lack natural predators or competitors in their new habitat, and efficiently utilize resources.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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