Reproductive behavior of Formosan Macaques (Macaca cyclopis) at Mt. Longevity

• Main Authors: CHIH-CHIEN HUANG, 黃志堅
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/32767543285336115643

碩士 === 國立中山大學 === 生物科學系研究所 === 91 === Abstract This study investigated the reproductive behaviors of Formosan macaques (Macaca cyclopis) from July 2000 to July 2002 with 608 field hours in Mt. Lonvegity. I followed troops C and Cd that resulted from a fission of troop C in Dec. 2000. During these two mating seasons, 19 sexually mature males and 19 females were involved in 188 mounting/thrusting series. These included 139 single and 49 multi-mounting thrusting series. The peak frequency of copulation was in Dec. in both years with means of 1.34/hr and 0.94/hr. However, the maximum number of males and females involved were in Nov and Nov~Dec.. with 18 (9M9F, 2001) and 22 (12M10F, 2001) individuals. The residency and ranks of males influence their copulation strategies. Alpha males performed over half of the multi-mount copulations (55.1%), followed by non-troop males and other troop males (each, 22.45﹪). On the other hand, the highest proportion of single mount copulations were from OTM (38.13%)。Biting and copulation calls occurred more frequently in multi-mount than in single mount copulation. The duration of thrust was longest in the last mount of multi-mount copulation series (10.9 sec ±5.4, n=45), next in single mount (8.16 sec ±4.2). Male dominant rank influenced the occurrence of consortships between heterosexual pairs. Nearly all of consortships observed were performed by troop males (94/105 = 89.4%), NTM just 10.48﹪(11/105 = 10.48%)。High-ranking males guarded estrous females and interfered low-ranking males'' copulation. The later used sneaky mating during the absence of dominant males or in the peripheral part of a social troop with poor visibility.。 Troop C was dominant to troop Cd in habitat utilization and intertroop interaction. Troop C often chased troop Cd away (78.3%) or troop C withdrew voluntarily (21.7%). After the troop fission, the peak of monthly frequency of copulation in Cd was higher than that in troop C (two mating seasons: 3.33/hr versus 1.44/hr, 2.80/hr versus 0.74/hr). The birth rates of these two troops both increased from 2001 to 2002 (C: 37.5% to 81.3%; Cd: 50.0% to 100%)。