Abstract
Understanding how niche differences evolve in ecologically similar species and how these differences are maintained is a fundamental question in ecology. We studied resource partitioning and niche overlap between the hoolock gibbon (Hoolock hoolock) and other frugivorous vertebrates from April 2016 to January 2018 in Satchari National Park, Sylhet, Bangladesh. We examined the differences in their diet, niche breadth, niche overlap, and characterization of patch use. We recorded feeding events of gibbons and other frugivorous vertebrates using ad libitum sampling. Gibbons consumed 76 plant species including 32 non-fig fruits and 14 figs. Twenty-one competing frugivorous vertebrate species shared 10–70% of their food species with hoolocks. Competition for fruits was intense among gibbons, macaques, and hornbills, as fruits comprised more than 50% of their diet. The niche breadth of the gibbons varied across seasons. It was lowest during the rainy season (BA = 0.39) when fruits were more readily available, and highest in winter (BA = 0.58) when gibbons were less selective due to food scarcity. The niche overlap was highest between gibbons and northern pig-tailed macaques (Ojk = 0.70), followed by gibbons and hornbills (Ojk = 0.68). Feeding heights and substrate used varied significantly between gibbons and competitors. Gibbons may minimize competition by specializing on various food resources and using different forest patches.
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Acknowledgements
This study was supported by The Rufford Foundation. We are grateful to them for their generous contribution. No fieldwork relating to this study would have been possible without the permission, help, and cooperation of the Bangladesh Forest Department. Sincere thanks to two anonymous reviewers for their comments and suggestions in the first draft of the manuscript. We express our sincere gratitude to the Department of Zoology, Jagannath University, Dhaka, for their guidance. We are greatly indebted to Arannayk Foundation for their logistical support and help in identifying plants. We are grateful to our field assistants and local guides for their relentless support during the fieldwork. We thank Tanvir Ahmed and Md. Sabit Hasan for their cooperation in map generation.
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Neha, S.A., Khatun, U.H. & Ul Hasan, M.A. Resource partitioning and niche overlap between hoolock gibbon (Hoolock hoolock) and other frugivorous vertebrates in a tropical semi-evergreen forest. Primates 62, 331–342 (2021). https://doi.org/10.1007/s10329-021-00888-9
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DOI: https://doi.org/10.1007/s10329-021-00888-9