Variability in group size and daily activity budget of family groups of the gelada baboon (Theropithecus gelada) at Guassa Community Conservation Area, Central Ethiopia

Mandefero Mamo; Tilaye Wube

doi:10.1186/s41610-019-0124-5

KOREAN
P-ISSN2287-8327
E-ISSN2288-1220
SCOPUS, KCI

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Vol.43 No.2

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Variability in group size and daily activity budget of family groups of the gelada baboon (Theropithecus gelada) at Guassa Community Conservation Area, Central Ethiopia

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220

2019, v.43 no.2, pp.263-270

https://doi.org/10.1186/s41610-019-0124-5

Mandefero Mamo (Addis Ababa University)
Tilaye Wube (Addis Ababa University)

Mandefero, M. , & Tilaye, W. (2019). Variability in group size and daily activity budget of family groups of the gelada baboon (Theropithecus gelada) at Guassa Community Conservation Area, Central Ethiopia. Journal of Ecology and Environment, 43(2), 263-270, https://doi.org/10.1186/s41610-019-0124-5

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Abstract

Background: The gelada baboon, Theropithecus gelada Ruppell, 1835, is an endemic primate of the central and western highlands of Ethiopia occurring between altitudes of 1800–4400 m. Variability in activity time budget between the two gelada social units, i.e., one-male units (OMUs) and all-male units (AMUs), has not been studied previously. Thus, the present study was an effort to understand intra- and inter-variations in group size and daily activity time budget in gelada baboon OMUs and AMUs at Guassa Community Conservation Area, Central Ethiopia. The instantaneous sampling method was used in the data collection. Results: Both OMU and AMU groups allocated more time for feeding (OMUs = 36.96%; AMUs = 35%) followed by moving (OMU = 25.8%; AMUs = 27%). Grooming was the most frequent social activity in both family groups (OMUs= 8.56%; AMUs = 11.81%). OMUs and AMUs did not show significant variation between themselves in the timebudget and temporal distribution of their daily activities. However, the overall variation in the time budget allocated for daily activities within OMUs and AMUs was statistically significant (p < 0.05%). The different age and sex groups in OMUs (i.e., immature, sub-adult females, subordinate males, adult females, and alpha males) showed statistically significant variation in their time budget allocation for the daily activities (p < 0.05) except for feedingand moving. Alpha males had the highest proportion of resting (32.14%) and aggression (31.92%). Immature individuals were responsible for > 90% of the time budget recorded for playing while adult females showed the highest frequency of grooming. Group size of OMUs ranged between 5 and 15 individuals (mean ± SD = 11.25 ±1.95). Adult females comprised the highest number within OMUs (mean = 4.5) followed by immature individuals(mean = 3). The group size of AMUs ranged from 4 to 8 (mean ± SD = 6.6 ± 1.5). Conclusion: Our results showed that the gelada baboon spent less time on foraging compared to previous studies at the Simien Mountains and Debre-Libanos area. We suggested this variation could be explained based on higher forage quality at Guassa Community Conservation Area resulting from better conservation of the habitat.

keywords: Afro-alpine, AMU, Central Ethiopia, Gelada baboons, OMU, Social behavior, Social units

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Article Contents

Vol.43 No.2

Variability in group size and daily activity budget of family groups of the gelada baboon (Theropithecus gelada) at Guassa Community Conservation Area, Central Ethiopia

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Reference

Journal of Ecology and Environment