Individual study: Field report on the Hainan gibbon
Zhenhe L., Haisheng J., Yongzu Z., Yanhua L., Tigon C., Manry D. & Southwick C. (1987) Field report on the Hainan gibbon. Primate Conservation, 8, 49-50
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Legally protect primate habitat
A before-and-after trial in 1978-1987 in tropical montane forest on Hainan Island, China found that the population of the Hainan gibbon Hylobates concolor hainanus increased from 7-8 individuals to 22 gibbons (34% increase) over nine years after the area was proclaimed the Bawanglin Nature Reserve. However, no statistical tests were carried out to determine whether this increase was significant. The total breeding population consisted of four adult males and seven adult females. In 1980, an area of 13 km2 was declared protected from hunting and logging activities. Three of the four remaining groups had a composition that was unusual for this species; they consisted of one adult male and two adult females with 2-4 young per group. The authors suggested that this may be a result of the small size of the group’s habitat, which may have encouraged individuals to remain in their natal group instead of dispersing to establish new territories.