Term
| what is an invasive species? |
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Definition
| non native species introduced into habitat outside their native range, become established and prolific |
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Term
| what are some of the consequences of invasive species? |
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Definition
| loss of native species diversity, ecosystem disruption, environmental damage |
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Term
| what are the direct and indirect impacts of zebra mussel invasion? |
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Definition
direct- filter feeders so increased water clarity, kill native clams, block pipes
indirect- botulism in birds, increased water clarity means increased aquatic plants, good for some species and bad for others |
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Term
| what is the connection between zebra mussels and botulism in birds? what is the cycle of transmission from mussel to bird? |
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Definition
| mussels filter feed and accumulate botulism toxin, round goby eats mussel and gets toxin, bird eats fish and gets toxin and dies |
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Term
| what are some obstacles that invasive species must overcome? |
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Definition
| travel to new region,native predators, competition from natives |
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Term
| why do invaders often outcompete native species? |
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Definition
| release from their native predators so nothing to kill them off |
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Term
| what is the enemy release hypothesis? the ecological resistance hypothesis? which of these supports the notion that invaders often outcompete native species? |
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Definition
enemy release- release from native predators
ecological resistance- competition with native species, predators kill them off |
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Term
| what are some reasons that invaders can escape their native parasites? |
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Definition
| ill hosts do not survive journey, vector parasites will not survive if vectors not present in new range, complex life cycle parasites might not be able to complete their cycles in new range |
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Term
| why does the enemy release hypothesis only apply in the short term? |
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Definition
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Term
| how did an invasive mosquito affect the abundance and current geographic range of birds in hawaii? |
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Definition
| mosquito killed off birds. birds forced to relocate to areas that the mosquito cannot survive |
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Term
| what are the similarities between invasive species and disease emergence? how is invasion effort similar to force of infection |
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Definition
invasion effort for invaders = force of infection for pathogens
invasion effort- number of times an invasion was attempted and the number of individuals in each invasion incident
force of infecion- # infectious individuals and likelihood of successful transmission event(beta). beta depends on dose/inoculum size |
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Term
| how does globalization impact the spread of invasive species and disease? |
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Definition
| more shipping routes can bring invasive species to new regions |
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