Tracking hornbill movements and seeds

Hornbill ranging, fruit distribution and implications for seed dispersal

How far do different hornbill species travel in search of fruits? How far do different hornbill species disperse the seeds of their food plants?

To find answers, we aim to tag three large-bodied hornbill species (Great, Wreathed and Rufous-necked) and gather information on their movement patterns 

  • Wreathed Hornbills are thought to move over a much wider range in the non-breeding season. This study would provide insights into the non-breeding ranges of this species

  • This study will allow us to compare hornbill movement patterns during breeding and non-breeding seasons and enhance our understanding of their role in seed dispersal in both seasons

  • This study will aid in our understanding of the role of the rare Rufous-necked Hornbill in seed dispersal

Full story coming soon...!

People

Funding

  • Department of Science & Technology (New Delhi)

Publications

  • Journal Article
    2019
    Large frugivores matter: insights from network and seed dispersal effectiveness approaches
    Journal of Animal Ecology ( https://doi.org/10.1111/1365-2656.13005)
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    PDF, 1.15 MB

    We evaluated the role of large avian frugivores in a plant‐disperser community by a) determining whether the plant‐disperser community was modular, with a distinct community of large frugivores (thereby highlighting their importance), b) determining relative qualitative and quantitative roles played by large‐bodied frugivores vis‐à‐vis other frugivores and c) determining impacts of large‐bodied frugivore loss on the plant‐disperser community. The study was carried at a tropical forest site in north‐east India which is part of the Eastern Himalaya Biodiversity Hotspot. We collected tree watch data (2055 h) from 46 tree species, which represented 85% of tree species that are predominantly bird‐dispersed in the area. We found that the plant‐disperser community was modular, with a distinct module of large‐seeded tree species and large frugivores. Intermediate‐sized frugivores such as barbets and bulbuls were the most connected, while large‐sized frugivores, such as hornbills and imperial‐pigeons were moderately well‐connected. Qualitative and quantitative roles played by different dispersers varied across the gradient of frugivore body size. Hornbills, the largest avian frugivores, consumed a significantly greater number of fruits and swallowed larger proportions of fruits compared to other avian groups. In comparison to similar‐sized frugivores, imperial‐pigeons fed on larger‐sized fruits, highlighting their importance for dispersal of large‐seeded plants. Under simulated extinction scenarios, larger extinction cascades weren't necessarily caused by larger frugivores, however, extinctions of certain large‐bodied frugivores (hornbills, imperial‐pigeons) caused extinction cascades. Integrating information from networks and seed dispersal effectiveness approaches enabled a better understanding of large frugivore role in a plant‐disperser community. While large‐bodied frugivores may not be playing a central role in plant‐disperser communities, they are crucial as seed dispersal service providers for large‐seeded plants. In conjunction with the reported local extinctions of large frugivores like hornbills from the south Asian region, this study's findings highlight the irreplaceable quantitative and qualitative impacts that tropical plant communities are likely to experience in the future.

  • Journal Article
    2016
    Abundance estimates of the Rufous-necked hornbill (Aceros nipalensis), and characterisation of a montane subtropical forest in the Indian Eastern Himalaya. 
    Indian Birds, Vol. 12, 4 & 5 14 November 2016
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    PDF, 715 KB

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