The figure shows the distribution of different life histories of Japanese winter

Question

The figure shows the distribution of different life histories of Japanese winter moth populations in different parts of Japan. Note in part a) of the figure that moths in northern sites have two different life histories while there is only 1 life history in the south. The b) part of the figure shows two things, the distribution of life histories from north to south, and the north to south distribution of winter temperatures.

There is only one population in the south because

Select one:

a. as the winter becomes less severe as one moves south, geographic isolation between the two moth populations increases.

b. as the winter becomes less severe as one moves south, the period of winter that is too harsh for the larval moths to be active decreases to the point where the early and late winter active moth populations are more isolated.

c. as the winter becomes less severe as one moves south, the period of winter that is too harsh for the pupal moths to be active decreases to the point where the early and late winter active moth populations are more isolated.

d. as the winter becomes more severe as one moves south, the period of winter that is too harsh for the adult moths to be active increases to the point where the early and late winter active moth populations are more isolated.

e. as the winter becomes less severe as one moves south, the period of winter that is too harsh for the adult moths to be active decreases to the point where the early and late winter active moth populations cease to be isolated.

Northerly sites have temporally distinct adult populations pupa adult egg larva pupa adult egg pupa summer autumn early winter late spring Sendai Sourtherly sites have just one population D F M pupa adult egg larva pupa summer autumn winter Kobuchizawa DF M Gifu Mean temperature of coldest month: below o°c 0-3°? above 3°C DF M Kyoto 40 30 9 20 210 0 D F M Month 0 200 km

Explanation / Answer

Answer:

There is only one population in South because as the winter because the winter becomes more severe as one moves south, the period of winter that is too harsh for the adult moths to be active increases to the point where the early and late winter active moth populations are more isolated.

Hence,option(d) is correct.

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