TommyWallach wrote:
Hey All,
Enough questions enough that I figured it might be worth my weighing in. As any good instructor would, I'm going to focus on the passage first.
Conclusion: Warming will extend Guillemots range north
Premises: Guillemots feed on fish beneath ice, nesting nearby. Need snow-free area to raise chicks. Area is warming, particularly north.
Assumption: Something other than the warming will keep them from extending range.
We know the assumption will be this limited, because otherwise the argument is solid (i.e. if the warm area is expanding, and they can live in warm weather, then obviously their range will expand).
(A) Even if the warming trend continues, there will still be years in which guillemot chicks are killed by an unusually early snow.
Problem: This has no connection to the issue of range, because this would happen anywhere.
(B) If the Arctic warming continues, guillemots’ current predators are likely to succeed in extending
...
Enough questions enough that I figured it might be worth my weighing in. As any good instructor would, I'm going to focus on the passage first.
Conclusion: Warming will extend Guillemots range north
Premises: Guillemots feed on fish beneath ice, nesting nearby. Need snow-free area to raise chicks. Area is warming, particularly north.
Assumption: Something other than the warming will keep them from extending range.
We know the assumption will be this limited, because otherwise the argument is solid (i.e. if the warm area is expanding, and they can live in warm weather, then obviously their range will expand).
(A) Even if the warming trend continues, there will still be years in which guillemot chicks are killed by an unusually early snow.
Problem: This has no connection to the issue of range, because this would happen anywhere.
(B) If the Arctic warming continues, guillemots’ current predators are likely to succeed in extending
...
Statistics : Posted by anish777 • on 07 Aug 2009, 19:39 • Replies 56 • Views 66876
