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Macaca thibetana at Mt. Emei, China: II. Birth seasonality
Author(s) -
Zhao Qikun,
Deng Ziyun
Publication year - 1988
Publication title -
american journal of primatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.988
H-Index - 81
eISSN - 1098-2345
pISSN - 0275-2565
DOI - 10.1002/ajp.1350160307
Subject(s) - seasonality , demography , biology , season of birth , altitude (triangle) , forehead , zoology , ecology , anatomy , mathematics , sociology , geometry
Birth censuses were conducted every 2 or 3 days for each of six groups of Macaca thibetana along trails at Mt. Emei in southwest China from March 7 to June 15, 1986. Based on direct observations and the timetable of forehead hair growth and behavior, each of 32 infants could be placed in one of sixteen 14‐day periods of the 1986 birth season. The mean estimated birth date was March 27 (SD = 39 days); the median estimated birth date was March 14. Sex ratios in newborns and yearlings did not deviate significantly from 1:1. Seasonal birth timing was correlated with the altitude of the range (r = −0.84, P < .05); that is, infants were born earlier in the season at higher altitudes.