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Climate Change and Populations

APBIO-K2MDNX

In a hypothetical situation, scientists studying the impacts of climate hypothesize that warmer temperatures in the arctic tundra should cause an increase in the population sizes of insects and herbivores.

They chart changes in the average temperatures for the month of July over a period of fifty years, as well as the annual population sizes of a certain insect species and a certain herbivorous species. Their data is shown in the graph below:

Temperature and Population Size Data for an Area in Alaska

Time (years) Mean July Temperatures (degrees C) Mosquito Population size (millions) Caribou Population size (thousands)
1958 33 31 400
1963 34 32 400
1968 35 38 400
1973 35 38 400
1978 36 43 380
1983 36 44 375
1988 37 57 343
1993 38 63 301
1998 38 63 281
2003 39 77 213
2008 40 88 164

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Based on the data collected, scientists can logically conclude that warmer temperatures impact what?

A

Positively impact herbivorous species in the arctic tundra.

B

Negatively impact insect species in the arctic tundra.

C

Have differing impacts on different species in the arctic tundra.

D

Have no significant impact on any species in the arctic tundra.