An Invasive Snail Is Accidentally Introduced into a River

question 57

Multiple Choice

An invasive snail is accidentally introduced into a river.It carries a pathogen to which it is adapted; however, the pathogen is a generalist that can infect various other mollusk species in the river and downstream.What is the most likely effect the introduced pathogen will have on the mollusk diversity of the river?

• A) It will remain in the invasive snail and will not affect the rest of the ecosystem.
• B) It will decrease mollusk biodiversity as it spreads into local species that are not adapted.
• C) It will enter other mollusks, but they will likely adapt readily to its presence.
• D) It will try to enter other mollusk species but be unable to become established.
• E) It will enter other mollusks but can be eradicated by removal of the invasive snail.

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