Reproductive parameters in M and K group chimpanzees during 35
years (1966-1999) |
Reproductive
parameters |
N |
Mean |
SD |
Range |
Age at first maximal swelling*1 (yrs.) |
5 |
10.63 |
0.51 |
|
Adolescent infertility*1*2 (mo.) |
4 |
|
|
14-49 |
Age at first birth (yrs.) |
5 |
15.60 |
4.52 |
|
Age of emigration from natal
group*1(yrs.) |
11 |
11.27 |
1.50 |
9.7-14.0 |
Time between immigration and
first birth*1 |
26 |
3.34 |
2.53 |
2-11.9 |
Afterbirth interval (yr.)
(previous offspring: male) |
15 |
6.04 |
0.70 |
5.25-7.25 |
(yr.) (previous offspring: female) |
18 |
5.52 |
0.63 |
4.33-6.50 |
The number of live birth
during lifetime |
26*3 |
3.85 |
|
|
|
25*4 |
2.68 |
1.25 |
|
The number of weaned offspring
during lifetime |
26*3 |
1.35 |
1.23 |
|
|
25*4 |
1.96 |
1.06 |
|
The age at final birth
(yrs.) |
35 |
|
|
22-47 |
|
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|
|
|
*1 The four parameter are
related to the age at first birth. |
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|
|
*2 The period between the
time of the first maximal swelling and the first birth |
|
*3 The birth record is
available from a young age (10-13 yrs.) to death at various ages. |
*4 The birth record is
available from middle age (18-33 yrs.) to death in older age (31-48 yrs.). |
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Source: |
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[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 |
[72] Nishida T. (2002) Demographic changes.
In: Nishida T., Uehara S. & Kawanaka K. (ed.) The Mahale Chimpanzees:
Thirty-seven Years of <Pantropology>. Kyoto University Press, Kyoto.
Pp. 171-202 |
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