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# Guillemots are birds of Arctic regions. They feed on fish

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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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22 Sep 2017, 08:10
D is correct
If no thin ice sheet ,no fish beneath it
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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04 Oct 2017, 16:12
My issue with (D): what if, in spite of the thin ice in the southern Arctic disappearing, the guilletmots' range expands so far up north that the loss of thin ice in the south Arctic is insignificant?

the way i see it, there are a few possible ways to decrease the # of guillemots: 1) increase # of predators; 2) decrease food supply. i don't see how 1 can be preferred over the other. they're equally dangerous.

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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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14 Oct 2017, 09:42
LakerFan24 wrote:
My issue with (D): what if, in spite of the thin ice in the southern Arctic disappearing, the guilletmots' range expands so far up north that the loss of thin ice in the south Arctic is insignificant?

the way i see it, there are a few possible ways to decrease the # of guillemots: 1) increase # of predators; 2) decrease food supply. i don't see how 1 can be preferred over the other. they're equally dangerous.

The point of the argument is that "the guillemots’ range will probably be enlarged." We're not concerned with decreasing the number of guillemots, only the size of their range. The author's reasoning is that their range will expand as the bird moves northward.

The author assumes that the bird will only add to its range as it moves northward. Choice (D) suggests that the northward expansion will come with a decrease in the range along the southern coast. Although this doesn't necessarily disprove the author's point, it's seriously weakens the argument and is thus the best answer.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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18 Oct 2017, 00:46
I don't get why the answer is D. What if the disappearance of thin ice in the South prompts the G-birds to venture North? How does this weaken the argument?
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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02 Nov 2017, 03:12
Now this one's a tricky question. Answer D.

Let me attempt this:

Conclusion of the argument : If the warming continues, the guillemots’ range will probably be enlarged by being extended northward along the coast.

Now since we have to weaken this conclusion, we have to try proving either of the following things:
1. The overall Guillemont's population will not enlarge (i.e. will remain same or decrease) when they extend northwards along the coast, OR
2. The Guillemonts will not be able to extend northwards along the coast altogether

Now, let's the consider the supporting premises which are necessary for the Guillemont's survival:
1. fish that gather beneath thin sheets of floating ice
2. 80 consecutive snowfree days

Having considered the premises and the conclusion lets weigh the options B and D:

Option B : If the Arctic warming continues, guillemots’ current predators are likely to succeed in extending their own range farther north.
The way this option has been worded (emphasis on current predators) makes us believe that Guillemots even before extending to North have predators in the current habitat i.e. along the south coast. And the Guillemots have been been surviving in the south in spite of the presence of predators and hence they will extend and survive in the north even if their predators extend in the north.

Option D : If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.
This option tells us that the Guillemot's survival is directly affected by the thinning of the ice and in turn the food that they feed on. And hence the extension of the birds to the North will not enlarge their numbers but will infact will remain same(or probably decrease?) as there is no food for them in the south.

Hence Option D.
Re: Guillemots are birds of Arctic regions. They feed on fish   [#permalink] 02 Nov 2017, 03:12

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