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¢M). On the other hand, the highest proportion of single mount copulations were from OTM (38.13%)¡CBiting 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 ¡Ó5.4, n=45), next in single mount (8.16 sec ¡Ó4.2). 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¢M(11/105 = 10.48%)¡CHigh-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.¡C 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%)¡C

Thesis (Ph. D.)--Cornell University, January, 2007. / Vita. Includes bibliographical references (leaves 214-229).

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 145-158).

Thesis--University of Nijmegen. / Summary in English and Dutch. Includes bibliographical references (p. 101-108).

Thesis (Ph. D.)--University of Washington, 1997. / Vita. Includes bibliographical references (leaves [58]-64).

Thesis (M.Sc. (Anatomy))--Mahidol University, 1982.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1963. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 67-70).

Thesis (Ph. D.)--University of Wisconsin-Madison, 1953. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographies.

Thesis (M.S.)--University of Wisconsin--Madison, 1960. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 66).

Thesis (M.A.)--University of Wisconsin, 1967. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 76-78).