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Effect of anthropogenic disturbance on the abundance and habitat occupancy of two endemic hornbill species in Buton island, Sulawesi


The Red-knobbed Hornbill Rhyticeros cassidix and the Sulawesi Tarictic Hornbill Penelopides exarhatus are endemic to Sulawesi. This study assessed the effect of anthropogenic disturbance on these two species in Lambusango forest, Buton, south-east Sulawesi. Data were collected between 2005 and 2007 in six study sites which varied in their levels of disturbance. Two of the lightly disturbed and two of the more heavily disturbed sites were within ‘protection forest’ whereas the rest were classified as ‘production forest’. We used point counts with distance sampling to survey the hornbills. Habitat data were also collected at each of the points and related to hornbill ‘occupancy’ with the program PRESENCE. Both hornbills were estimated to be at higher density in the lightly disturbed forest but the level of disturbance had more of a detrimental effect on Red-knobbed Hornbill than on Sulawesi Tarictic Hornbill. Lightly disturbed forest had significantly more large trees than the heavily disturbed forest but there was no difference in the abundance of figs. Using four covariates (disturbance level, protection status, number of large trees, and number of figs), 99% of presence/absence of Red-knobbed Hornbills at the points could be explained by habitat disturbance and 87% by forest status; the same covariates explained 76% of presence/absence for the Sulawesi Tarictic Hornbill with abundance of large trees as the most important factor. These results support the notion that Red-knobbed Hornbill is more sensitive to anthropogenic disturbance and its conservation is highly dependent upon the preservation of forest habitats with low levels of disturbance.

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      Effect of anthropogenic disturbance on the abundance and habitat occupancy of two endemic hornbill species in Buton island, Sulawesi
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Alvard M. S. and Winarni N. L. (1999) Avian biodiversity in Morowali Nature Reserve, Central Sulawesi, Indonesia and the impact of human subsistence activities. Tropical Biodivers. 6: 5974.
Anggraini K., Kinnaird M. and O’Brien T. (2000) The effects of fruit availability and habitat disturbance on an assemblage of Sumatran hornbills. Bird Conserv. Int. 10: 189202.
Buckland S. T., Anderson D. R., Burnham K. P., Laake J. L., Borchers D. L. and Thomas L. (2001) Introduction to distance sampling: estimating abundance of biological populations. Oxford: Oxford University Press.
Burnham K. P. and Anderson D. R. (2004) Multimodel inference: Understanding AIC and BIC in model selection. Sociol. Method. Res. 33: 261304.
Cahill A. J. and Walker J. S. (2000) The effects of forest fire on the nesting success of the Red-knobbed Hornbill Aceros cassidix. Bird Conserv. Int. 10: 109114.
Caro T. M. and O’Doherty G. (1999) On the use of surrogate species in conservation biology. Conserv. Biol. 13: 805814.
Cleary D. F. R., Boyle T. J. B., Setyawati T., Anggraeni C. D., Loon E. E. V. and Menken S. B. J. (2007) Bird species and traits associated with logged and unlogged forest in Borneo. Ecol. Applic. 17: 11841197.
Coates B., Bishop K. D. and Gardner D. (1997) A guide to the birds of Wallacea: Sulawesi, the Moluccas and Lesser Sunda Islands, Indonesia. Alderley, Queensland: Dove Publications.
Coles T. (2006) State of the Lambusango forests 2006. Bau-bau, Indonesia: Operation Wallacea Trust.
Curran L. M., Trigg S. N., McDonald A. K., Astiani D., Hardiono Y. M., Siregar P., Caniago I. and Kasischke E. (2004) Lowland forest loss in protected areas of Indonesian Borneo. Science 303: 10001003.
Datta A. (1998) Hornbill abundance in unlogged forest, selectively logged forest and a forest plantation in Arunachal Pradesh, India. Oryx 32: 285294.
FWI/GFW (2002) The state of the forest: Indonesia. Bogor, Indonesia and Washington, DC: Forest Watch Indonesia and Global Forest Watch.
Gaveau D. L. A., Wandono H. and Setiabudi F. (2007) Three decades of deforestation in southwest Sumatra: Have protected areas halted forest loss and logging, and promoted re-growth? Biol. Conserv. 134: 495504.
Hadiprakarsa Y. (2008) Forest patch occupancy by Sumatran hornbills in a fragmented landscape of southern Sumatra, Indonesia. Masters Thesis. Graduate School, University of Georgia, Athens.
Hadiprakarsa Y., Kinnaird M. F., Iqbal M. and O’Brien T. G. (2007) Forest fragmentation effects on hornbills across the southern Sumatra landscape. Pp. 8091 in Kemp A. C. and Kemp M. I., eds. The active management of hornbills and their habitats for conservation. Proceedings of the 4th International Hornbill Conference, Bela-bela, South Africa: Mabula Game Lodge.
Holmes D. A. (2002) Indonesia: Where have all the forests gone? Washington DC: The World Bank.
Johns A. D. (1987) The use of primary and selectively logged rainforest by Malaysian hornbills (Bucerotidae) and implications for their conservation. Biol. Conserv. 40: 179190.
Jones M. J., Linsley M. D. and Marsden S. J. (1995) Population sizes, status and habitat associations of the restricted-range bird species of Sumba, Indonesia. Bird Conserv. Int. 5: 2152.
Kalina J. (1988) Ecology and behavior of the Black-and-White Casqued Hornbill (Bycanistes subcylindricus subquadratus) in Kibale Forest, Uganda. PhD Dissertation. Michigan State University, Michigan.
Kinnaird M. F. and O’Brien T. G. (2005) Fast foods of the forest: The influence of figs on primates and hornbills across Wallace’s line. Pages 155184in Dew J. L. and Boubli J. P., eds. Tropical fruits and frugivores: the search for strong interactors. New York: Springer.
Kinnaird M. F. and O’Brien T. G. (2007) The ecology and conservation of Asian hornbills: Farmers of the forest. Chicago and London: The University of Chicago Press.
Kinnaird M. F., O’Brien T. G. and Suryadi S. (1996) Population fluctuation in Sulawesi red-knobbed hornbills: tracking figs in space and time. The Auk 113: 431440.
Lambeck R. J. (1997) Focal species: A multi-species umbrella for nature conservation. Conserv. Biol. 11: 849856.
Lee D. C. and Marsden S. J. (2008) Adjusting count period strategies to improve the accuracy of forest bird abundance estimates from point transect distance sampling surveys. Ibis 150: 315325.
Linkie M., Smith R. J. and Leader-Williams N. (2004) Mapping and predicting deforestation patterns in the lowlands of Sumatra. Biodivers. Conserv. 13: 18091818.
MacKenzie D. I., Nichols J. D., Lachman G. B., Droege S., Royle A. J. and Langtimm C. A. (2002) Estimating site occupancy rates when detection probabilities are less than one. Ecology 83: 22482255.
MacKenzie D. I., Nichols J. D., Royle A. J., Pollock K. H., Bailey L. L. and Hines J. E. (2006) Occupancy estimation and modeling: Inferring patterns and dynamics of species occurrence. Amsterdam: Elsevier.
Marsden S. J. (1999) Estimation of parrot and hornbill densities using a point count distance sampling method. Ibis 141: 327390.
Marsden S. J. and Jones M. J. (1997) The nesting requirements of the parrots and hornbill of Sumba, Indonesia. Biol. Conserv. 82: 279287
Marsden S. J. and Pilgrim J. D. (2003) Factors influencing the abundance of parrots and hornbills in pristine and disturbed forests on New Britain, Papua New Guinea. Ibis 145: 4553.
Marsden S. J., Whiffin M. and Galetti M. (2001) Bird diversity and abundance in forest fragments and Eucalyptus plantations around an Atlantic forest reserve, Brazil. Biodivers. Conserv. 10: 737751.
Meijaard E., Sheil D., Nasi R., Augeri D., Rosenbaum B., Iskandar D., Setyawati T., Lammertink M., Rachmatika I., Wong A., Soehartono T., Stanley S. and O’Brien T. G. (2005) Life after logging: reconciling wildlife conservation and production forestry in Indonesian Borneo. Bogor, Indonesia: CIFOR.
O’Brien T. G. (1997) Behavioural ecology of the North Sulawesi Tarictic Hornbill Penelopides exarhatus exarhatus during the breeding season. Ibis 139: 97101.
O’Brien T. G. and Kinnaird M. F. (2000) Differential vulnerability of large birds and mammals to hunting in North Sulawesi, Indonesia, and the outlook for the future. Pages 199213 in Bennett E. L. and Robinson J. G.. eds. Hunting for sustainability in tropical forests. New York: Columbia University Press.
Poonswad P. (1995) Nest site characteristics of four sympatric species of hornbills in KhaoYai National Park, Thailand. Ibis 137: 183191.
Reynolds R. T., Scott J. M. and Nussbaum R. A. (1980) A variable circular-plot method for estimating bird numbers. Condor 82: 309313.
Sanderson E. W., Redford K. H., Vedder A., Coppolillo P. B. and Ward S. E. (2002) A conceptual model for conservation planning based on landscape species requirements. Landscape Urban Plan. 58: 4156.
Seymour A. (2004) Monitoring forest degradation and animal populations in the forests of Central Buton: preliminary results from the pilot study. Bau-Bau, Indonesia: Operation Wallacea Trust.
Singer H. A. and Purwanto E. (2006) MisterikekayaanhayatihutanLambusango. Program KonservasiHutanLambusango (PKHL). Bau-bau, Indonesia: Operation Wallacea Trust.
Sodhi N. S., Liow L. H. and Bazzaz F. A. (2004) Avian extinctions from tropical and subtropical forests. Annu. Rev. Ecol. Evol. Syst. 35: 323345.
Thomas L., Laake J. L., Strindberg S., Marques F. F. C., Buckland S. T., Borchers D. L., Anderson D. R., Burnham K. P., Hedley S. L., Pollard J. H., Bishop J. R. B. and Marques T. A. (2006) Distance 5.0. Release 2. St Andrews, UK: Research Unit for Wildlife Population Assessment, University of St. Andrews.
Walker J. S. (2007) Dietary specialization and fruit availability among frugivorous birds on Sulawesi. Ibis 149: 345356.
Waltert M., Mardiastuti A. and Muhlenberg M. (2004) Effects of land use on bird species richness in Sulawesi, Indonesia. Conserv. Biol. 18: 13391346.
Whitney K. D. and Smith T. B. (1998) Habitat use and resource tracking by African Ceratogymna hornbills: implications for seed dispersal and forest conservation. Anim. Conserv. 1: 107117.
Whitten A. J., Henderson G. S. and Mustafa M. (2002) The ecology of Sulawesi. Hong Kong: Periplus Edition (HK) Ltd.
Winarni N. L. (2009) Community patterns of birds and butterflies in tropical forest of southeast Sulawesi and the selection of indicator species for ecological monitoring. PhD Thesis. School of Biology, Chemistry and Health Science. Faculty of Science and Engineering. Manchester Metropolitan University, Manchester, UK.
Winarni N. L. and Jones M. J. (2009) The effect of anthropogenic disturbance on hornbill populations in Buton, southeast Sulawesi. 63 pp. 5th International Hornbill Conference, Singapore Botanic Gardens, Singapore.
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Bird Conservation International
  • ISSN: 0959-2709
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