To determine: At which age the cohort of a female Belding’s ground squirrel produces the most female young ones.
Introduction: A female Belding’s ground squirrel is a species of squirrels that are inhabitants of mountains and are generally found in the mountains of the U.S. region.
Given data: With reference to Table 53.1, “Life table for Female Belding’s Ground Squirrels (Spermophilusbeldingi) at Tioga Pass, in the Sierra Nevada of California”, and Table 53.2, “Reproductive Table for Belding’s Ground Squirrels at Tioga Pass”, the average number of female offspring alive and the age of the squirrel are mentioned in the table below.
Table 1
Age of the squirrel | Number alive at start of year (from column 2 in Table 53.1) | Average number of female offspring (from column 5 in Table 53.2) | Average number of female offspring alive |
0-1 | 337 | 0.00 | 0.00 |
1-2 | 252 | 1.07 | 269.64 |
2-3 | 127 | 1.87 | 237.49 |
3-4 | 67 | 2.21 | 148.07 |
4-5 | 35 | 2.59 | 90.65 |
5-6 | 19 | 2.08 | 39.52 |
6-7 | 9 | 1.70 | 15.3 |
7-8 | 5 | 1.93 | 9.65 |
8-9 | 4 | 1.93 | 7.72 |
9-10 | 1 | 1.58 | 1.58 |
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