WLF 448: Fish & Wildlife Population Ecology
Lecture Notes IV, Fall 1996

 

Life table for Dall Sheep in Mount McKinley National Park, Alaska, based on age grouping of skulls of animals dying of natural causes.

Age Interval (yrs)

x

Number Alive at Start

1x

Number of Deaths

dx

Annual Mortality Rate (%)

qx

Annual Survival Rate (%)

sx

0-1 655 41 6.3a 93.7
1-2 614 117 19.1 80.9
2-3 497 10 2.0 98.0
3-4 487 9 1.8 98.2
4-5 478 9 1.9 98.1
5-6 469 23 4.9 95.1
6-7 446 34 7.6 92.4
7-8 412 37 9.0 91.0
8-9 375 48 12.8 87.2
9-10 327 79 24.2 75.8
10-11 248 92 37.1 62.9
11-12 156 88 56.4 43.6
12-13 68 64 94.1 5.9
13-14 4 1 . .
14-15 3 3 . .
Total 5239 655 12.5 87.5

a Percentages carried one place beyond statistical significance. Original data from Murie (1944).

Return to Lecture Notes IV. Estimation Population Parameters - II.

Revised: August 25, 2011