oe 
Table 7.—-Derivation of Overall Mortality Rate from a Single Nonfluctuating Source of 
Mortality Data 
The important condition in this theoretical population is the constancy of each mortality factor. 
The table demonstrates how a sample of banded birds dying from one mortality factor will still 
yield a reliable estimate of the overall annual mortality rate due to all factors. 
Frequency by Age Intervals 




Total 
THEORETICAL POPULATION aia 
(1) Alive at start 1000 300 90 27 8.10 2.43 0.73 1427.533/ 
(2) Shot (604) 600 180 Sy 16.2 4.86 1.46 856.52 
(3) Number left 00 120 36 10.8 3.2 0.97 571.01 
(4) Diseases, etc. (25%) 100 30 9 207 0.81 0.2) 142.75 
(S) Number left 300 —=——s«@”O] 27 8.1 2043 0.73 28.26 
(6) Total losses 700 210 63 18.9 5.67 1.70 999.27 
(7) Annual Mort. rate 70 70 70 70 70 70 
A. Dynamic Calculation 
Number shot I/ 600 180 Su.0 16.20 4.86 1.46 856.52 
YAlive at start" 856.52 256.52 76.52 22.52 6.52 1.46 1219.86 © 
Mortality rate 70 70 70 70 77 100 
B. Time-specific calculation 
WAlive at startet) 600 180 SuL.0 16.20 .86 1.46 856.52 
calculated deaths 420 126 37.8 11.34 3-10 1.46 600 
Mortality rate 70 70 70 70 70 100 
DISEASE, ACCIDENT, AND PREDATION ~~ SSCS; XETTC:SCS iri 
SAMPLE 
A. Dynamic calculation 
Found dead¢, 100 30 9 267 0.81 0.2k 12.75 
"Alive at start* 2.75 2.75 12.75 3.75 1.05 0.2h 203.29 
Mortality rate 70 70 70 72 77 100 
B. Time-specific calculation 
live at start) 100 30 9 2.7 0.81 0.2h W2.75 
Caiculated deaths 70 21 6.3 1.89 0.57 0.2h 100.00 
Mortality rate 70 70 70 70 70 100 

1/ data from line (2) above 
2/ data from line (Ij) above 
3/ this column does not include any birds in age 6-7 
