Association of grassland birds with Saccharum-Imperata patch in a northeastern tea estate of Bangladesh

Main Article Content

Muntasir Akash
http://orcid.org/0000-0002-3999-2882
Tania Khan
http://orcid.org/0000-0001-6127-0969
Sayam U. Chowdhury
http://orcid.org/0000-0002-1901-8900

Abstract

Saccharum-Imperata grasslands in Bangladesh were once directly associated with 10 native extirpated birds and still harbor many diminutives.  These habitats are now pocketed only in northeastern regions of the country due to intensive conversion, overstocked grazing and fire suppression.  After a hiatus of about four decades, composition and interaction of grassland specialist birds within a managed habitat of a tea estate was studied between November 2015 and May 2016 at micro-habitat scale using line transects, diversity indices, Bray-Curtis cluster analysis and linear mixed models.  Including 819 individuals of 39 grassland specialists, a total of 2,586 individuals of 110 species were recorded.  The analyses indicated the landscape to have a significant effect on species richness.  Of six micro-habitats, the area along the creek and dense tall grasses are important habitats for grassland specialists.  The latter ranked top in Shannon’s index (H′) for specialists (33 species, H′ = 2.988) followed by micro-habitats along the creek (18, 2.592) and sparse short grass (16, 2.401), comparing marked difference with micro-habitats of sparse grass along the road (21, H′=2.279), bush associated (11, 2.206) and crop associated areas (11, 2.124).  The effect of slash-and-burn was stark on specialists, no significant association was found with grazing.  This has been surmised as relationship among specialists’ ecology, long-term treatment effect and unpalatable nature of Saccharum ravennae as fodder.  Based on the hypothesis, the study emphasizes exigencies of a potential management strategy for avian habitats within tea estates of Bangladesh.

Article Details

How to Cite
[1]
Akash, M., Khan, T. and Chowdhury, S.U. 2018. Association of grassland birds with Saccharum-Imperata patch in a northeastern tea estate of Bangladesh. Journal of Threatened Taxa. 10, 7 (Jun. 2018), 11831–11843. DOI:https://doi.org/10.11609/jott.3469.10.7.11831-11843.
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Articles
Author Biographies

Muntasir Akash, Department of Zoology, University of Dhaka, Neelkhet Road, Dhaka 1000, Bangladesh

Muntasir Akash is an aspiring naturalist with an ardent curiosity in studying taxonomy, ecological and biological aspects of the Tropics, especially of crustaceans, fishes, birds and lesser cats. He has completed BS and MS degree in Zoology from the Department of Zoology, University of Dhaka and has been serving as a faculty to the same department since 2017.

Tania Khan, Bangladesh Bird Club, House-11, Road-4, Banani D.O.H.S., Kakali, 1206 Dhaka, Bangladesh

Tania Khan is a keen birdwatcher based in Sylhet, NE Bangladesh and a member of the Bangladesh Bird Club. She played a key role in discovering the grassland area where the study took place. She is a well known for her animal rehabilitation work in Bangladesh.

 

Sayam U. Chowdhury, Spoon-billed Sandpiper Task Force, Flat - 501, House - 16/C , Road - Tallabag, Sobhanbagh, Dhaka 1207, Bangladesh

Sayam U. Chowdhury has been working in behavioral ecology, research and conservation of globally threatened species in Bangladesh and abroad for the last 12 years. He has an undergraduate degree in Environmental Science from the North South Universtiy and MPhil in Biodiversity Conservation from University of Cambridge.

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