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Nesting Ecology of Malabar Grey Hornbill Ocyceros griseus in a Mosaic Landscape in the Southern Western Ghats, India

Nesting Ecology of Malabar Grey Hornbill Ocyceros griseus in a Mosaic Landscape in the Southern... Malabar Grey Hornbill (Ocyceros griseus) is endemic to the Western Ghats and occupies a wide range of habitats in modified and natural landscapes. There was a lack of detailed studies on the ecology of this species in modified habitats. We studied nest site characteristics and breeding biology in a mosaic habitat in the southern Western Ghats for more than six years (March 2013 to December 2019). Use and reuse of nest-tree and nest-cavities, their characteristics were recorded. Nest success and food preferences were also assessed. A total of 20 nesting attempts from 13 nest-cavities were observed in indigenous tree species and reuse of the nests was random. Average nesting days were 87.33 ± 1.93 (n = 6) days and all the nesting attempts were successful. The nest-trees belonging to 8 species from 7 families had 8.71–26.48 m height with a diameter of 0.33–0.81 m at breast height. Nest-cavities were at 4.77–20.26 m height with 0.28–0.80 m substrate diameter at cavity height, cavity entrance length 5.00–20.00 cm, and width 5.00–30.00 cm. We compared our results with previous nesting reports of the Malabar Grey Hornbill for an insight into the cavity selection across habitats. Our observations add to the lower range of tree and nest characteristics known for this species. The results indicate a wide preference range of nest-tree related values, but nest-cavity related range was narrow. We conclude that the Malabar Grey Hornbill probably prefers cavity characteristics over habitat and tree characteristics for its breeding. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Proceedings of the Zoological Society Springer Journals

Nesting Ecology of Malabar Grey Hornbill Ocyceros griseus in a Mosaic Landscape in the Southern Western Ghats, India

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Publisher
Springer Journals
Copyright
Copyright © Zoological Society, Kolkata, India 2022
ISSN
0373-5893
eISSN
0974-6919
DOI
10.1007/s12595-022-00446-1
Publisher site
See Article on Publisher Site

Abstract

Malabar Grey Hornbill (Ocyceros griseus) is endemic to the Western Ghats and occupies a wide range of habitats in modified and natural landscapes. There was a lack of detailed studies on the ecology of this species in modified habitats. We studied nest site characteristics and breeding biology in a mosaic habitat in the southern Western Ghats for more than six years (March 2013 to December 2019). Use and reuse of nest-tree and nest-cavities, their characteristics were recorded. Nest success and food preferences were also assessed. A total of 20 nesting attempts from 13 nest-cavities were observed in indigenous tree species and reuse of the nests was random. Average nesting days were 87.33 ± 1.93 (n = 6) days and all the nesting attempts were successful. The nest-trees belonging to 8 species from 7 families had 8.71–26.48 m height with a diameter of 0.33–0.81 m at breast height. Nest-cavities were at 4.77–20.26 m height with 0.28–0.80 m substrate diameter at cavity height, cavity entrance length 5.00–20.00 cm, and width 5.00–30.00 cm. We compared our results with previous nesting reports of the Malabar Grey Hornbill for an insight into the cavity selection across habitats. Our observations add to the lower range of tree and nest characteristics known for this species. The results indicate a wide preference range of nest-tree related values, but nest-cavity related range was narrow. We conclude that the Malabar Grey Hornbill probably prefers cavity characteristics over habitat and tree characteristics for its breeding.

Journal

Proceedings of the Zoological Society – Springer Journals

Published: Sep 1, 2022

Keywords: Malabar grey hornbill; Ocyceros griseus; Mosaic landscape; Tree-microhabitat; Tree-cavity; Nest selection; Western Ghats; Secondary cavity user

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