TABLE 2.
Life-history parameters for the model species, scaled to constant population size
| Human
|
Sparrow
|
Barnacle
|
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Age (x) | lx | bx | vx | lx | bx | vx | lx | bx | vx |
| 1 | 1.000 | 0 | 1.000 | 1.000 | 0 | 1.000 | 1.00000 | 0 | 1.0 |
| 2 | 0.979 | 0 | 1.022 | 0.180 | 2.546 | 5.556 | 0.00062 | 359.2 | 1612.9 |
| 3 | 0.978 | 0.017 | 1.023 | 0.095 | 2.754 | 5.679 | 0.00034 | 679.4 | 2279.4 |
| 4 | 0.975 | 0.290 | 1.009 | 0.051 | 2.921 | 5.518 | 0.00020 | 898.1 | 2666.6 |
| 5 | 0.972 | 0.344 | 0.720 | 0.027 | 3.130 | 4.899 | 0.00016 | 991.8 | 2267.2 |
| 6 | 0.968 | 0.215 | 0.378 | 0.014 | 3.339 | 3.339 | 0.00011 | 991.8 | 1771.4 |
| 7 | 0.964 | 0.114 | 0.164 | — | — | — | 0.00007 | 991.8 | 1299.3 |
| 8 | 0.957 | 0.045 | 0.050 | — | — | — | 0.00002 | 991.8 | 991.8 |
| 9 | 0.946 | 0.006 | 0.006 | — | — | — | — | — | — |
| 10 | 0.928 | 0 | 0 | — | — | — | — | — | — |
| Generation (T) | 5.26 | 3.0 | 4.0 | ||||||
Sources: humans, Felsenstein (1971), based on data for United States white females taken from U. S. Department of Health, Education, and Welfare (1969, Vol. II, Part A, Table 5-2); white-crowned sparrow, modified from Baker et al. (1981); barnacle, modified from Connell (1970). Ages are 5-year units in humans and 1 year in the other two species.