Name: Scarity of Water
Uploaded: 2019-07-19
Duration: 6 min 34 s
Description: In this video, we will learn about a shortage of water and its preventions, the effect of scarcity of water on plants and plant bodies if they are not irriga...

Question

The graph shows how the estimated population of snowshoe hares and lynx in one part of Canada changed over 20 years.

Year	1916	1917	1918	1919	1920
Estimated number of snowshoe hares (in thousand)	28	16	9	12	5

a) Use the data shown in the table to finish plotting the line for the snowshoe hares.

b) Describe how the population of Lynx changed between 1913 and 1917.

c) When the snowshoe hare population increased, the Lynx population also started to increase. Explain why.

Accepted Answer

a)

b) Several external factors affect the population. By observing the graph we can conclude that during 1913 the population of Snowshoe hares is at its peak. The graph for Snowshoe hares shows the maximum peak of 80 (in thousand). But the population of Lynx was slowly increasing, but it has not reached its peak. The graph of Lynx was at 20 (in thousand) and it starts increasing from 1913 to 1915. But after 1915 the rise in the population of Lynx was falling. In 1917 the population of Lynx already came down to 19-18 (in thousand). The decrease in the population of Lynx was due to the decrease in the population of the Snowshoe hares. The food availability for Lynx was decreasing, thus the population of Lynx decrease.

c) Snowshoe hare is the primary food of the lynx as lynx get their energy and nutrition by feeding on snowshoe hares. As the hare population size grows, the lynx population size begins to increase in response. The more the population of Snowshoe hares, the more food is available for the Lynx, thus the more the Lynx will reproduce. Thus, the population of Lynx increase with the population of Snowshoe hares increases.

Month	January	February	March	April	May	June
Number of plants	765	768	772	483	212	167

Month	January	February	March	April	May	June
Number of plants	765	768	772	483	212	167

Important Questions on Ecology

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