Ecology HS – Read and interpet HARE AND LYNX POPULATION simple data & draw on graph, Answer Questions on pdf

Ecology HS – Read and interpet simple data & draw on graph, Answer Questions on pdf ATTACHMENTS

Ensure your answers and data accurate and MAKE SURE YOU LABE THINGS AS DIRECTED ON THE HANDOUTS IN THE PARAGRAPHS…PLEASE READ AND COMPLETE ALL TASKS ON ATTACHED AS REQUIRED

REAS ALL PARAGRAPHS AS THERE IS REQUIREMENTS IN EACH

EMBED Excel.Sheet.8

Hares and Lynx Populations

1900

1902

1904

1906

1908

1910

1912

1914

1916

1918

1920

Year

Number of pelts in thousands

Hares (x1000)

Lynx(x1000)

_1033671615.xls
Chart1

1900 1900

1901 1901

1902 1902

1903 1903

1904 1904

1905 1905

1906 1906

1907 1907

1908 1908

1909 1909

1910 1910

1911 1911

1912 1912

1913 1913

1914 1914

1915 1915

1916 1916

1917 1917

1918 1918

1919 1919

1920 1920

Hares (x1000)
Lynx(x1000)
Year
Number of pelts in thousands
Lynx and Hare Populations
30
4
47.2
6.1
70.2
9.8
77.4
35.2
36.3
59.4
20.6
41.7
18.1
19
21.4
13
22
8.3
25.4
9.1
27.1
7.4
40.3
8
57
12.3
76.6
19.5
52.3
45.7
19.5
51.1
11.2
29.7
7.6
15.8
14.6
9.7
16.2
10.1
24.7
8.6

Sheet1

Year Hares (x1000) Lynx(x1000) H0 30

1900 30 4 L0 4

1901 47.2 6.1 a1 0.5

1902 70.2 9.8 a2 0.02

1903 77.4 35.2 b1 0.9

1904 36.3 59.4 b2 0.03

1905 20.6 41.7

1906 18.1 19

1907 21.4 13

1908 22 8.3

1909 25.4 9.1

1910 27.1 7.4

1911 40.3 8

1912 57 12.3

1913 76.6 19.5

1914 52.3 45.7

1915 19.5 51.1

1916 11.2 29.7

1917 7.6 15.8

1918 14.6 9.7

1919 16.2 10.1

1920 24.7 8.6

Year Hares Lynx

1900 30000 4000

1901 47200 6100

1902 70200 9800

1903 77400 35200

1904 36300 59400

1905 20600 41700

1906 18100 19000

1907 21400 13000

1908 22000 8300

1909 25400 9100

1910 27100 7400

1911 40300 8000

1912 57000 12300

1913 76600 19500

1914 52300 45700

1915 19500 51100

1916 11200 29700

1917 7600 15800

1918 14600 9700

1919 16200 10100

1920 24700 8600

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Hares (x1000)
Lynx(x1000)
Year
Number of pelts in thousands
Lynx and Hare Populations

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_1033671993.xls
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1900 1900

1901 1901

1902 1902

1903 1903

1904 1904

1905 1905

1906 1906

1907 1907

1908 1908

1909 1909

1910 1910

1911 1911

1912 1912

1913 1913

1914 1914

1915 1915

1916 1916

1917 1917

1918 1918

1919 1919

1920 1920

Hares (x1000)
Lynx(x1000)
Year
Number of pelts in thousands
Hares and Lynx Populations
30
4
47.2
6.1
70.2
9.8
77.4
35.2
36.3
59.4
20.6
41.7
18.1
19
21.4
13
22
8.3
25.4
9.1
27.1
7.4
40.3
8
57
12.3
76.6
19.5
52.3
45.7
19.5
51.1
11.2
29.7
7.6
15.8
14.6
9.7
16.2
10.1
24.7
8.6

Sheet1

Year Hares (x1000) Lynx(x1000) H0 30

1900 30 4 L0 4

1901 47.2 6.1 a1 0.5

1902 70.2 9.8 a2 0.02

1903 77.4 35.2 b1 0.9

1904 36.3 59.4 b2 0.03

1905 20.6 41.7

1906 18.1 19

1907 21.4 13

1908 22 8.3

1909 25.4 9.1

1910 27.1 7.4

1911 40.3 8

1912 57 12.3

1913 76.6 19.5

1914 52.3 45.7

1915 19.5 51.1

1916 11.2 29.7

1917 7.6 15.8

1918 14.6 9.7

1919 16.2 10.1

1920 24.7 8.6

Year Hares Lynx

1900 30000 4000

1901 47200 6100

1902 70200 9800

1903 77400 35200

1904 36300 59400

1905 20600 41700

1906 18100 19000

1907 21400 13000

1908 22000 8300

1909 25400 9100

1910 27100 7400

1911 40300 8000

1912 57000 12300

1913 76600 19500

1914 52300 45700

1915 19500 51100

1916 11200 29700

1917 7600 15800

1918 14600 9700

1919 16200 10100

1920 24700 8600

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Hares (x1000)
Lynx(x1000)
Year
Number of pelts in thousands
Hares and Lynx Populations

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Hare and Lynx Populations

Populations are always changing. Sometimes changes are the result of humans interfering with food webs or habitats. But even when humans do not interfere, populations will still naturally shift up and down or fluctuate. For example, let us study the relationship between the Canada lynx and its primary prey, the snowshoe hare.

To understand how the population of lynx and hares changes year to year, we need to collect information about the number of individuals in a population. Unfortunately, it is impossible to count the exact number of hares in Canada in any given year. Therefore, this information must be gained by capturing a small number of individuals and then estimating the actual number out in the wild. For over

0 years, the Hudson Bay Company has been involved in the fur trade in Canada. Detailed company records list the number of snowshoe hare pelts and the number of lynx pelts collected by hunters and trappers every year since the late 1700’s. A small sample of this data is presented in the table below.

Year

Hares (x1000)

Lynx(x1000)

1901

47.2

6.1

1902

70.2

1903

7.4

35.2

1904

36.3

59.4

1905

20.6

41.7

1906

18.1

1907

21.4

1908

8.3

1909

25.4

9.1

1910

27.1

7.4

1911

40.3

1912

12.3

1913

76.6

19.5

1914

52.3

45.7

1915

19.5

51.1

1916

11.2

9.7

1917

7.6

15.8

1918

14.6

9.7

1919

16.2

10.1

1920

24.7

8.6

On the graph paper provided, use one color of pencil to graph the number of hares trapped each year between

1900

and 1920. Using another color, graph the number of lynx trapped.

Questions:

What patterns do you notice? Describe at least 3 patterns.

First, let’s think about the hares.

Scientists observe that as the hare population gradually increases, they eat more and more grass and seeds each year until the food supply, particularly during the winter, becomes scarce. At that point, young hares have a difficult time finding enough food to survive and fewer babies are born. On your graph, label these periods of hardship with arrows and a short description of what is happening in your own words.

As the number of hares decreases, what do you think happens to the population of grass and seeds that the hares eat? Why?

After a few years, the hare population begins to increase. Why? On your graph, label these periods of prosperity with arrows and a short description of what is happening in your own words.

Now, let’s think about the lynx which eats the snowshoe hares.

In general, are there more lynx or more hares? Why?

Do the peaks in the lynx graph line up exactly with the peaks in the hares graph?

When the hare population increases, what happens to the lynx population? Why? On your graph, label these periods of prosperity with arrows and a short description of what is happening in your own words.

Look at 1903 and 1904. Think about what is happening to the hares at this time. Is the presence of more lynx helping the hares or hurting them? Why?

When the hare population declines, the lynxes compensate by switching to other prey such as squirrels, gophers, mice and other rodents. However, while there are other prey around, there is not enough to support a large lynx population. When females are in poor condition, fewer will breed and not all of those bred will produce litters. Litters will be smaller, and most, if not all, of the few kittens born will die soon after birth. On your graph, label these periods of hardship with arrows and a short description of what is happening in your own words.

Check to see that your graph has 2 lines AND 4 arrows with labels.

� EMBED Excel.Sheet.8 ��

A MyScienceBox Lesson Plan by Irene Salter (http://www.mysciencebox.org). This work is licensed under the Creative Commons Attribution-NonCommercial License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

Year
Hares (x1000)
Lynx(x1000)
1900
30
4
1901
47.2
6.1
1902
70.2

9.8

1903

77.4

35.2
1904
36.3
59.4
1905
20.6
41.7
1906
18.1
19
1907
21.4
13
1908
22
8.3
1909
25.4
9.1
1910
27.1
7.4
1911
40.3
8
1912
57
12.3
1913
76.6
19.5
1914
52.3
45.7
1915
19.5
51.1
1916
11.2

29.7

1917
7.6
15.8
1918
14.6
9.7
1919
16.2
10.1
1920
24.7
8.6

_1033670858.xls

Sheet1

Year Hares (x1000) Lynx(x1000) H0 30

1900 30 4 L0 4

1901 47.2 6.1 a1 0.5

1902 70.2 9.8 a2 0.02

1903 77.4 35.2 b1 0.9

1904 36.3 59.4 b2 0.03

1905 20.6 41.7

1906 18.1 19

1907 21.4 13

1908 22 8.3

1909 25.4 9.1

1910 27.1 7.4

1911 40.3 8

1912 57 12.3

1913 76.6 19.5

1914 52.3 45.7

1915 19.5 51.1

1916 11.2 29.7

1917 7.6 15.8

1918 14.6 9.7

1919 16.2 10.1

1920 24.7 8.6

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Hares (x1000)
Lynx(x1000)
Year
Number of pelts in thousands
Lynx and Hare Populations

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