Cohort life table for M group chimpanzees during 19 years (1980-1999) | |||||

x | Nx^{*1} |
dx^{*2} |
cx^{*3} |
qx^{*4} |
lx^{*5} |

0 | 152 | 53 | 0 | 0.34868 | 1.00000 |

1 | 99 | 24 | 8 | 0.25263 | 0.65132 |

2 | 67 | 9 | 1 | 0.13534 | 0.48678 |

3 | 57 | 7 | 3 | 0.12613 | 0.42090 |

4 | 47 | 1 | 2 | 0.02174 | 0.36781 |

5 | 44 | 3 | 0 | 0.06818 | 0.35981 |

6-10 | 178 | 7 | 11 | 0.04058 | 0.34521 |

11-15 | 79 | 3 | 9 | 0.04027 | 0.32940 |

16-20 | 38 | 1 | 4 | 0.02941 | 0.31614 |

21-25 | 20 | 1 | 1 | 0.05128 | 0.30684 |

26-30 | 11 | 0 | 2 | 0 | 0.29111 |

^{*1} The total
number of individuals included in the specific age interval, from age x to
age x+1 |
|||||

^{*2} The total
number of individuals that died between specific age intervals |
|||||

^{*3} The total
number of individuals that emigrated from the group between specific age
intervals |
|||||

^{*4} Annual
mortality rate between specific age interval, calculated from the equation
dx(Nx-cx/2) |
|||||

^{*5} Survival rate
between birth and specific age x |
|||||

Source: | |||||

[67] Nishida T., Corp N., Hamaib M., Hasegawa T., Hiraiwa-Hasegawa M., Hosaka K., Hunt K.D., Itoh N., Kawanaka K., Matsumoto-Oda A., Mitani J.C., Nakamura M., Norikoshi K., Sakamaki T.,Turner L., Uehara S., Zamma K. (2003) Demography, female life history, and reproductive profiles among the chimpanzees of Mahale. Am. J. Primatol. 59: 99-121 |