Volume 33 Issue 3
May  2012
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WANG Shuang-Jin, HUANG Zhi-Pang, HE Yu-Chao, HE Xiao-Dong, LI Dong-Hui, SUN Jun, CUI Liang-Wei, XIAO Wen. Mating behavior and birth seasonality of black-and-white snub-nosed monkeys (Rhinopithecus bieti) at Mt. Lasha. Zoological Research, 2012, 33(3): 241-248. doi: 10.3724/SP.J.1141.2012.03241
Citation: WANG Shuang-Jin, HUANG Zhi-Pang, HE Yu-Chao, HE Xiao-Dong, LI Dong-Hui, SUN Jun, CUI Liang-Wei, XIAO Wen. Mating behavior and birth seasonality of black-and-white snub-nosed monkeys (Rhinopithecus bieti) at Mt. Lasha. Zoological Research, 2012, 33(3): 241-248. doi: 10.3724/SP.J.1141.2012.03241

Mating behavior and birth seasonality of black-and-white snub-nosed monkeys (Rhinopithecus bieti) at Mt. Lasha

doi: 10.3724/SP.J.1141.2012.03241
  • Received Date: 2012-02-03
  • Rev Recd Date: 2012-03-27
  • Publish Date: 2012-06-22
  • Copulation patterns are important to understanding male mating strategies and stabilization strategies of social organizations in primates. However, information on copulation patterns of Asian primates is relatively rare. This study was undertaken to collect data on mating behavior and birth seasonality of Black-and-white Snub-nosed monkeys (Rhinopithecus bieti) using all occurrence sampling and Focal animal-scan sampling methods at Mt. Lasha, between January and December, 2011. Our study focused on observing mating frequency and birth rates. Snub-nosed monkeys mate year round, with two observable peaks: one reproductive peak during the mating season, roughly from August to October, and a second non-breeding peak during the birth season. It is unclear what biological significance this non-reproductive mating peak has. During our observation, we noted a lower ratio of mount to ejaculation and rare ejaculatory copulations, which indicated that every mating would not result in ejaculation. This study corroborates the previous view that the Rhinopithecus bieti’s copulatory pattern is likely multiple-mount ejaculation (MME) or at the upper part of mating continuum of single-mount ejaculation (SME) toward MME. More ejaculatory copulations initiated by males than females indicate that MME is not only a mating strategy of males, but that males can influence the position of their copulatory pattern on the continuum between SME and MME. The mating frequencies significantly correlated with the birth rates with a delay of 6 to 7 months. Monkeys gave birth within a strict seasonality with a birth peak of March, which confirms the previous view. Infants were born with a certain degree of synchronization, but different populations displayed different modes of synchronizations.
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Mating behavior and birth seasonality of black-and-white snub-nosed monkeys (Rhinopithecus bieti) at Mt. Lasha

doi: 10.3724/SP.J.1141.2012.03241

Abstract: Copulation patterns are important to understanding male mating strategies and stabilization strategies of social organizations in primates. However, information on copulation patterns of Asian primates is relatively rare. This study was undertaken to collect data on mating behavior and birth seasonality of Black-and-white Snub-nosed monkeys (Rhinopithecus bieti) using all occurrence sampling and Focal animal-scan sampling methods at Mt. Lasha, between January and December, 2011. Our study focused on observing mating frequency and birth rates. Snub-nosed monkeys mate year round, with two observable peaks: one reproductive peak during the mating season, roughly from August to October, and a second non-breeding peak during the birth season. It is unclear what biological significance this non-reproductive mating peak has. During our observation, we noted a lower ratio of mount to ejaculation and rare ejaculatory copulations, which indicated that every mating would not result in ejaculation. This study corroborates the previous view that the Rhinopithecus bieti’s copulatory pattern is likely multiple-mount ejaculation (MME) or at the upper part of mating continuum of single-mount ejaculation (SME) toward MME. More ejaculatory copulations initiated by males than females indicate that MME is not only a mating strategy of males, but that males can influence the position of their copulatory pattern on the continuum between SME and MME. The mating frequencies significantly correlated with the birth rates with a delay of 6 to 7 months. Monkeys gave birth within a strict seasonality with a birth peak of March, which confirms the previous view. Infants were born with a certain degree of synchronization, but different populations displayed different modes of synchronizations.

WANG Shuang-Jin, HUANG Zhi-Pang, HE Yu-Chao, HE Xiao-Dong, LI Dong-Hui, SUN Jun, CUI Liang-Wei, XIAO Wen. Mating behavior and birth seasonality of black-and-white snub-nosed monkeys (Rhinopithecus bieti) at Mt. Lasha. Zoological Research, 2012, 33(3): 241-248. doi: 10.3724/SP.J.1141.2012.03241
Citation: WANG Shuang-Jin, HUANG Zhi-Pang, HE Yu-Chao, HE Xiao-Dong, LI Dong-Hui, SUN Jun, CUI Liang-Wei, XIAO Wen. Mating behavior and birth seasonality of black-and-white snub-nosed monkeys (Rhinopithecus bieti) at Mt. Lasha. Zoological Research, 2012, 33(3): 241-248. doi: 10.3724/SP.J.1141.2012.03241
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