TABLE 6-2Per Annum Vital Rates for Wild-Fraging Amboseli Baboon Males (1971-1999) by One-Year Age Classes for Analysis in Projection Matrix Models

Male Age ClassEntries in Population Projection MatrixElasticityAge-Specific Birth Rateb
SurvivorshipFertilityaSurvivalFertility
10.782500.106600
20.912200.106600
30.933700.106600
40.916700.106600
50.958800.106600
60.94270.37340.09480.01170
70.93900.77590.07430.02050
80.94160.77910.05700.01730.0667
90.93110.76630.04280.01430.5754
100.91120.74230.03130.01150.8155
110.89440.72210.02220.00910.6493
120.88200.70740.01510.00710.8176
130.84560.66520.00990.00520.5543
140.82950.64670.00600.00380.4919
150.78160.59500.00340.00260.3007
160.66650.47470.00200.00150.3326
170.62510.43340.00120.00080.0776
180.80020.62520.00050.00060.0647
190.75000.58590.00010.00040.0485
200.33330.213100.00010.0776
2100000
a

The fertility entry takes into account both adult survival in the interval and birth rate to individuals in that interval; it is based on the full cohort that enters an age class, whether they survive the age class or not. Because baboons, like humans, do not have a distinct birth season our calculations are based on a birth flow model. For details, see Caswell (2001) and Alberts and Altmann (2003).

b

Our calculation of birth rate (and therefore fertility) for males is based on the proportion of mating attributable to males of that age class (see text and Alberts and Altmann, 2003, especially p. 78 and Appendix 4.1 for reproductive rate terminology).

From: 6, Intraspecific Variability in Fertility and Offspring Survival in a Nonhuman Primate: Behavioral Control of Ecological and Social Sources

Cover of Offspring
Offspring: Human Fertility Behavior in Biodemographic Perspective.
National Research Council (US) Panel for the Workshop on the Biodemography of Fertility and Family Behavior; Wachter KW, Bulatao RA, editors.
Washington (DC): National Academies Press (US); 2003.
Copyright © 2003, National Academy of Sciences.

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