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

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Muntasir Akash
Tania Khan
Sayam U. Chowdhury


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.

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How to Cite
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:
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.


Ahammed, K.M. (2012). Investment for Sustainable Development of Bangladesh Tea Industry – An Empirical Study, pp: 1–20. In: Bangladesh Economic Association (BEA) XVIIl Biennial Conference Papers. Dhaka, xii+320pp.

Ahmed, Z.U., M.A. Hassan, Z.N.T., Begum, M. Khondker, S.M.H. Kabir, M. Ahmad, A.T.A. Ahmed, A.K.A. Rahman & E.U. Haque (eds.) (2008a). Encyclopedia of Flora and Fauna of Bangladesh, Angiosperms: Monocotyledons (Orchidaceae–Zingiberaceae), Vol. 12. Asiatic Society of Bangladesh, Dhaka, 552pp.

Ahmed, Z.U., Z.N.T. Begum, M.A. Hassan, M. Khondker, S.M.H. Kabir, M. Ahmad, A.T.A. Ahmed, A.K.A. Rahman & E.U. Haque (eds.) (2008b). Encyclopedia of Flora and Fauna of Bangladesh, Angiosperms: Dicotyledons (Acanthaceae: Asteraceae) Vol. 6. Asiatic Society of Bangladesh, Dhaka, 408pp.

Akash, M., T. Khan & S.U. Chowdhury (2017). Grassland specialist birds in a managed habitat of north-east Bangladesh. Dhaka University Journal of Biological Sciences 26(2): 175–187.

ArcGIS 10.3.1. (2015). GIS (geographic information systems) mapping software. ESRI - Environmental Systems Research Institute, Redlands, CA.

Arellano–Valle, R.B. & M.G. Genton (2005). On fundamental skew distributions. Journal of Multivariate Analysis 96(1): 93–116;

Bates, D., M. Maechler, B. Bolker & S. Walker (2015). Fitting Linear Mixed-Effects Models Using lme4. Journal of Statistical Software 67(1): 1-48;

Besnard, A.G., Y. Fourcade & J. Secondi (2016). Measuring difference in edge avoidance in grassland birds: the Corncrake is less sensitive to hedgerow proximity than passerines. Journal of Ornithology 157(2): 515–523;

Bibby, C.J., N.D. Burgess & D.A. Hill (1992). Bird census techniques. British Trust for Ornithology and the Royal Society for the Protection of Birds, London, 257pp;

Callaway, R.M., Z. Kikvidze & D. Kikodze (2000). Facilitation by unpalatable weeds may conserve plant diversity in overgrazed meadows in the Caucasus Mountains. Oikos 89(2): 275–282;

Chowdhury, S.U. (2016). Recent Rarities, pp. 19–20. In: Banglar Pakhi - Bangladesh Bird Club Newsletter. Bangladesh Bird Club, Dhaka, 21pp.

Coppedge, B.R., D.M. Engle, R.E. Masters, & M.S. Gregory (2001). Avian response to landscape change in fragmented southern Great Plains grasslands. Ecological Applications 11(1): 47–59;[0047:ARTLCI]2.0.CO;2

da Silva, T.W., G. Dotta & C.S. Fontana (2015). Structure of avian assemblages in grasslands associated with cattle ranching and soybean agriculture in the Uruguayan savanna ecoregion of Brazil and Uruguay. The Condor 117(1): 53–63;

Davis, C.A., R.T. Churchwell, S.D. Fuhlendorf, D.M. Engle & T.J. Hovick (2016). Effect of pyric herbivory on source–sink dynamics in grassland birds. Journal of Applied Ecology 53(4): 1004–1012;

Duchardt, C.J., J.R. Miller, D.M. Debinski & D.M. Engle (2016). Adapting the Fire–Grazing Interaction to Small Pastures in a Fragmented Landscape for Grassland Bird Conservation. Rangeland Ecology & Management 69: 300–309;

Ellison, K.S. C.A. Ribic, D.W. Sample, M.J. Fawcett & J.D. Dadisman (2013). Impacts of tree rows on grassland birds and potential nest predators: a removal experiment. PloS One 8(4): e59151;

Frank, D.A. & R.D. Evans (1997). Effects of native grazers on grassland N cycling in Yellowstone National Park. Ecology 78(7): 38–48;

Fretwell, S.D. & A.L. Barach (1977). The regulation of plant communities by the food chains exploiting them. Perspectives in Biology and Medicine 20(2): 169–185;

Gardener, M. (2012). Statistics for ecologists using R and Excel. Data collection, exploration. Pelagic Publishing, Exeter, 324pp.

Garmin GPSMap 62S (2005). Navigational device for Global Positioning System. Garmin, Kansas.

Garrity, D.P. M. Soekardi, M. van Noordwijk, R. de la Cruz, P.S. Pathak, H.P.M. Gunasena & N.M. Majid (1997).

The Imperata grasslands of tropical Asia: area, distribution, and typology. Agroforestry Systems 36(1-3): 3–29.

Google Earth Pro 7.1. (2015). Virtual globe, map and geographical information program. Google Incorporated.

Goroshi, S., R.P. Singh, A. Jain, P. Jalil, A. Sonakia & J.S. Parihar (2015). Assessment of influence and inter–relationships of soil properties in tropical grasslands of central India. Agricultural Engineering International: CIGR Journal 17(3): 458–465.

Grimmett, R., C. Inskipp, T. Inskipp & R. Allen (2011). Birds of the Indian Subcontinent. Christopher Helm, London, 528pp.

Gul, B., M. Islam, S. Ahmad & S. Gul (2014). Effect of prescribed fire on forage production and nutritive value of the perennial grass Saccharum griffithii. Phyton (Buenos Aires) 83: 415–421.

Helzer, C.J. & D.E. Jelinski (1999). The relative importance of patch area and perimeter–area ratio to grassland breeding birds. Ecological Applications 9(4): 1448–1458.

Henty, E.E. (1982). Grasslands and grassland succession in New Guinea, pp. 459–473. In: Gressitt, J.L. (ed.). Biogeography and ecology of New Guinea. Springer, the Netherlands, 515pp.

IUCN Bangladesh (2015a). Red List of Bangladesh: Birds, Vol. 3. IUCN, International Union for Conservation of Nature, Bangladesh Country Office, Dhaka, 676pp.

IUCN Bangladesh (2015b). Red List of Bangladesh: A Brief on Assessment Result. IUCN, International Union for Conservation of Nature, Bangladesh Country Office, Dhaka, 24pp.

Johnson, D.H. & L.D. Igl (2001). Area requirements of grassland birds: a regional perspective. The Auk 118(1): 24–34.

Kabir, S.M.H., Haque, E.U. & M.A. Islam (2010). Wildlife of Dhaka, pp: 83–128. In: Islam, M.A., S.U. Ahmed & A.K.M.G. Rabbani (eds.). Environment of Capital Dhaka: Plants Wildlife Gardens Parks Open Spaces Air Water

Earthquake. Asiatic Society of Bangladesh, Dhaka, 492pp.

Khan, M.A.R. (1988). The grassland avifauna of Bangladesh, pp: 215–219. In: Goriup P.D. (ed.). Ecology and Conservation of Grassland Birds. Technical Publication No. 7. International Council for Bird Preservation, Cambridge.

Khan, M.M.H., T. Khan, A. Ahmed & T.A. Shovon (2015). Notes on nesting Bristled Grassbird Chaetornis striata, Tanguar Haor, Bangladesh. Birding ASIA 24: 93–95.

Khan, M.S. (1977). Flora of Bangladesh. Journal of Bangladesh Agricultural Research Council 4: 4–11.

Khatri, P.K. & K.N. Barua (2011). Structural composition and productivity assessment of the grassland community of Kazhiranga National Park, Assam. Indian Forester 137(3): 90.

Kindt, R. & R. Coe (2005). Tree Diversity Analysis -Â A Manual and Software for Common Statistical Methods for Ecological And Biodiversity Studies. World Agroforestry Centre (ICRAF), Nairobi, 191pp.

Knopf, F.L. (1994). Avian assemblages on altered grasslands. Studies in Avian Biology 15: 247–257.

Magurran, A.E. (2004). Measuring Biological Diversity. Blackwell Publishing, Oxford, 19–215pp.

Manakadan, R. (2014). The Grassland Birds of Rollapadu Wildlife Sanctuary, Andhra Pradesh, India, with Special Reference to the Impact of Grazing-Free Enclosures. Journal of the Bombay Natural History Society 111(2): 81–89;

McNaughton, S.J. (1993). Grasses and grazers, science and management. Ecological Applications 3(1): 17–20.

Milchunas, D.G., O.E. Sala & W. Lauenroth (1987). A generalized model of the effects of grazing by large herbivores on grassland community structure. American Naturalist 87–106.

Moore, K.J. & H.J.G. Jung (2001). Lignin and fiber digestion. Journal of Rangeland Mangagement 420–430.

Norment, C.J., M.C. Runge & M.R. Morgan (2010). Breeding Biology of Grassland Birds in Western New York: Conservation and Management Implications. Avian Conservation and Ecology 5(2): 3–21;

Osborne, D.C. & D.W. Sparling (2013). Multiâ€scale associations of grassland birds in response to costâ€share management of conservation reserve program fields in Illinois. The Journal of Wildlife Management 77(5): 920–930;

Pandey, V.C., K. Singh, R.P. Singh & B. Singh (2012). Naturally growing Saccharum munja L. on the fly ash lagoons: a potential ecological engineer for the revegetation and stabilization. Ecological Engineering 40: 95–99;

Pandey, V.C., O. Bajpai, D.N. Pandey & N. Singh (2015). Saccharum spontaneum: an underutilized tall grass for revegetation and restoration programs. Genetic Resources and Crop Evolution 62(3): 443–450;

Pathak, S.D. (2005). A statistical profile of Tripura. Population 31(91): 168.

Peart, D.R. (1989). Species interactions in a successional grassland. III. Effects of canopy gaps, gopher mounds and grazing on colonization. Journal of Ecology 267–289;

Peet, N.B., A.R. Watkinson, D J. Bell & B.J. Kattel (1999). Plant diversity in the threatened sub-tropical grasslands of Nepal. Biological Conservation 88(2): 193–206;

Peterjohn, B. (1994). The North American breeding bird survey. Birding 26(6): 386–398.

Peterson, A. & N. Slade (1998). Extrapolating inventory results into biodiversity estimates and the importance of stopping rules. Diversity and Distributions 4(3): 95–105.

Pinheiro, J., D. Bates, S. DebRoy, D. Sarkar & R Core Team (2017). nlme: Linear and Nonlinear Mixed Effects Models. R package version 3.1-131,>.

Polley, H.W., H.B. Johnson & H.S. Mayes (1994). Increasing CO2: comparative responses of the C4 grass Schizachyrium and grassland invader Prosopis. Ecology 75: 976–988.

Pomeroy, D. (1992). Counting Birds: A guide to assessing numbers, biomass and diversity of Afrotropical birds. African Wildlife Foundation, 25pp.

R Core Team (2016). R 3.3.0: A Language and Environment for Statistical Computing, version:3.0.0. R Foundation for Statistical Computing, Vienna.

Rahmani, A.R., N. Khongsai, A. Rahmani, M. Imran, T. Sagwan & S. Ojah (2016). Conservation of Threatened Grassland Birds of the Brahmaputra Floodplains. Bombay Natural History Society Publication, Mumbai.

Round, P.D., E.U. Haque, N. Dymond, A.J. Pierce & P. Thompson (2014). Ringing and ornithological exploration in north-east Bangladesh wetlands. Forktail 30: 109–121.

Rowntree, J.B. (1954). An introduction to the vegetation of the Assam valley. Indian Forest Records New Series 9(1): 1–87.

Saigal, O. (2005). Tripura-The Land. Ishani 1(4): 33–36;

Samson, F. & F. Knopf (1994). Prairie conservation in North America. BioScience 44(6): 418–421.

Seifert, H.S. & K.A. Beller (1969). Hydrocyanic acid poisoning in cattle caused by grazing on sugar cane (Saccharum officinarum) and supplemental feeding of fruits of the Algarrobo Tree (Prosopis juliflora). Berliner und Münchener tierärztliche Wochenschrift 82(5): 88.

Siddiqui, K.U., M.A. Islam, Z.U. Ahmed, Z.N.T. Begum, A.K.A. Rahman & E.U. Haque (eds.) (2008a). Encyclopedia of Flora and Fauna of Bangladesh, Angiosperms: Monocotyledons (Agavaceae-Najadaceae), Vol. 11. Asiatic Society of Bangladesh, Dhaka, 399pp.

Siddiqui, K.U., M.A. Islam, S.M.H. Kabir, M. Ahmad, A.T.A. Ahmed, A.K.A. Rhaman, E.U. Haque, Z.U. Ahmed, Z.N.T. Begum, M.A. Hassan, M. Khondker & M.M. Rahman (eds.) (2008b). Encyclopedia of flora and fauna of

Bangladesh, Birds, Vol. 26. Asiatic Society of Bangladesh, Dhaka, 622pp.

Singh, J.S. & L. Krishnamurthy (1981). Analysis of structure and function of tropical grassland vegetation of India. Indian Review of Life Science 1: 225–270.

Singh, J.S., W.K. Lauenroth & D.G. Milchunas (1983). Geography of grassland ecosystems. Progress in Physical Geography 7(1): 46–80.

Sliwinski, M.S. & N. Koper (2012). Grassland Bird Responses to Three Edge Types in a Fragmented Mixed-Grass Prairie. Avian Conservation and Ecology 7(2): 6.

Thompson, P.M., S.U. Chowdhury, E.U. Haque, M.M.H. Khan & R. Halder (2014). Notable bird records from Bangladesh from July 2002 to July 2013. Forktail 30: 50–65.

Venables, W. N. & B. D. Ripley (2002). Modern Applied Statistics with S. 4th Edition. Springer, New York.

Vickery, P.D. & J.R. Herkert (1995). Ecology and Conservation of Grassland Birds in Western Hemisphere. Studies in Avian Biology 19: 1–298.

Whyte, R.O. (1977). Analysis and ecological management of tropical grazing lands, pp. 121. In: Krause, W. (ed.). Applications of vegetation science to grassland husbandry. The Hague, 250 pp.

Zalba, S.M. & N.C. Cozzani (2004). The impact of feral horses on grassland bird communities in Argentina. Animal Conservation 7(1): 35–44;