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      Understanding stable bi-female grouping in gibbons: feeding competition and reproductive success

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          Abstract

          Introduction

          Species of the order Primates are highly gregarious with most species living in permanent heterosexual social groups. According to theory in socioecology maximum social group size is limited by rates of intra-group feeding competition and associated increases in travel costs. Unlike other hylobatids, which are predominantly pair living, cao vit gibbons ( Nomascus nasutus), and two other species of crested gibbon ( Nomascus spp.) living in northern seasonal forest, regularly exhibit larger bi-female groups. To better understand the ability of northern gibbons to live in stable bi-female groups, we examined food distribution, feeding competition and reproductive success over a period of six years in a small cao vit gibbon population at Bangliang, Guangxi, China.

          Results

          In general, we found weak evidences for within-group contest or scramble competition in our two study groups, which we attribute to high spatial and temporal heterogeneity in the distribution of their important food species. Nevertheless, the larger of the two groups studied increased feeding time and group spread during lean periods, factors that may limit cao vit gibbon group size to a maximum of two breeding females. Relative to tropical pair-living gibbons, there is no evidence that cao vit gibbons travel farther or spend more time feeding, but they did consume more leaves and buds and less fruit and figs. Despite their highly folivorous diet, the average inter-birth interval is comparable to tropical gibbon populations, and the survival rate of infants and juveniles in our study groups is high.

          Conclusion

          Cao vit gibbons do not suffer obvious costs in terms of feeding competition and reproductive success by living in bi-female groups, but within-group feeding competition may determine the upper the limit of cao vit gibbon group size to a maximum of two breeding females. These findings contribute to a growing body of evidence that bi-female grouping can be a stable grouping pattern of gibbons in certain habitats and further emphasize the flexibility of gibbon social organization.

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          Most cited references 56

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          Observational study of behavior: sampling methods.

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            Finch flocks in the Mohave Desert

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              The Evolution of Monogamy in Large Primates: a New Hypothesis and Some Crucial Tests

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                Author and article information

                Contributors
                fanpf1981@gmail.com
                thad.bartlett@utsa.edu
                feihanlan@163.com
                changyong.ma@gmail.com
                zzwwzhangwenzzww@163.com
                Journal
                Front Zool
                Front. Zool
                Frontiers in Zoology
                BioMed Central (London )
                1742-9994
                5 March 2015
                5 March 2015
                2015
                : 12
                Affiliations
                [ ]Institute of Himalaya Biodiversity Research, Dali University, Dali, 671003 Yunnan People’s Republic of China
                [ ]Department of Anthropology, The University of Texas at San Antonio, San Antonio, TX 78249 USA
                Article
                98
                10.1186/s12983-015-0098-9
                4355570
                © Fan et al.; licensee BioMed Central. 2015

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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                Research
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                © The Author(s) 2015

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