Self-study
Watanabe: To protect the native kokanee salmon in the lake, we must allow fishing of native trout. ████ ██████ █████ ████ █████ ███ ██████ ███████ █████████
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Summarize Argument
Lopez concludes eliminating non-native mysis shrimp would be better for the kokanee salmon population than allowing fishing for native trout. Why? Because while trout eat mature kokanee, mysis shrimp eat plankton, which lowers plankton levels enough that young kokanee salmon starve.
Notable Assumptions
Lopez assumes eliminating mysis shrimp and thus allowing more young kokanee to avoid starvation would be better for the kokanee population than fishing for native trout and thus allowing more adult kokanee to survive predation. This means assuming that removing the mysis shrimp would leave much more plankton available for young kokanee to eat.
6.
Which one of the following ███████████ ██ ██████ ████ ████████ ████████ ███████ ███████████
a
Eliminating a non-native ███████ ████ █ ███████ ██ █████ ██ █████████ █ ██████ ███████ ██ ██████████ ██ ███ █████ ██████ ██ ██████████ ███ ██████████ ██████ ████████
This strong principle supports Lopez’s argument. Since the mysis shrimp is non-native and threatens the native kokanee population, it implies removing the shrimp is the best way to protect the kokanee.
b
When trying to ███████ ███ ████ ██████ ██ █ ██████████ ████████ ██ ██ ████ ██ █████████ ███ ██████ ████ ████ ████ ███ ████████ ████████ ███ ████ █████ ██████
Without more information, this doesn’t strengthen or weaken Lopez’s argument. It’s not suggested that allowing trout fishing would protect the kokanee’s food supply, nor is it indicated which would work faster—removing the shrimp or removing the trout.
c
The number of ███████ ██ █ █████ ███████ ██████ ███ ██ ███████ ██ ██ ███ █████████
This weakens Lopez’s argument. It implies other ways of helping the kokanee population—allowing trout fishing, for example—are preferable to removing a whole species, which Lopez advocates.
d
No non-native species ██████ ██ ██████████ ████ █ ███████ ██████ ███ ███ █████████ ███████ ██ ████ ████████████ ████ ████ ███████████
This supports not introducing mysis shrimp in the first place, but it says nothing about removing species that are already present. Since the mysis shrimp have already been introduced, this principle doesn’t apply.
e
When seeking to ████████ ███ ██████████ ██ █ █████ ████████ ██ ██ ████ █████████ ████ ███ ████████ ███ ███████ ██ ███ ███████ ███ ███ ██ ███ █████ ████████████ █████ ██ █████ ██████
If anything, this weakens Lopez’s argument. It implies mature kokanee should be prioritized, suggesting it would be better to allow trout fishing than to remove mysis shrimp.