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The Bar-headed Goose (Anser indicus) is a species that relies heavily on the plateau wetlands of Asia and whose population was thought to be declining. Over the past decade, south-central Tibet, one of the most important wintering grounds, supported large numbers of Bar-headed Geese, but the population had not been regularly monitored in this area.
We surveyed wintering Bar-headed Geese along the Yarlung Zangbo, Lhasa and Nyang Qu rivers, the three major river valleys and their tributaries in south-central Tibet in January 2014 and recorded their location, flock size and habitat utilization. Based on these data and the latest wintering counts elsewhere, we revised the population estimate for this species.
We recorded more than 67, 000 Bar-headed Geese in south-central Tibet during January 2014. By geographic area, the geese were most abundant in the Lhasa River valley (38.5%) and the Nyang Qu River valley (31.0%), and by administrative division in Lhunzhub (27.2%) and Shigatse (26.7%). Bar-headed Geese were most often observed feeding in winter wheat fields and ploughed fields, resting on pastureland and marshes. The approximate number of 67, 000 geese recorded in Tibet is more than four times the estimate of 1993 for the same region and exceeds the most recent world population estimate of 52, 000-60, 000. Based on our work in Tibet and the latest wintering counts available from other areas, we revised the estimated population size of this species to 97, 000-118, 000.
Our result reveals a remarkable increase in the number of Bar-headed Geese wintering in south-central Tibet. This population increase most likely stems from a proliferation of cropland and especially winter wheat fields in south-central Tibet. This habitat improvement may also cause short-stopping of the Bar-headed Goose and thus reduce mortality of the geese that would otherwise undertake a somewhat daunting trans-Himalayan migration.
The Bar-headed Goose (Anser indicus) is a species that relies heavily on the plateau wetlands of Asia and whose population was thought to be declining. Over the past decade, south-central Tibet, one of the most important wintering grounds, supported large numbers of Bar-headed Geese, but the population had not been regularly monitored in this area.
We surveyed wintering Bar-headed Geese along the Yarlung Zangbo, Lhasa and Nyang Qu rivers, the three major river valleys and their tributaries in south-central Tibet in January 2014 and recorded their location, flock size and habitat utilization. Based on these data and the latest wintering counts elsewhere, we revised the population estimate for this species.
We recorded more than 67, 000 Bar-headed Geese in south-central Tibet during January 2014. By geographic area, the geese were most abundant in the Lhasa River valley (38.5%) and the Nyang Qu River valley (31.0%), and by administrative division in Lhunzhub (27.2%) and Shigatse (26.7%). Bar-headed Geese were most often observed feeding in winter wheat fields and ploughed fields, resting on pastureland and marshes. The approximate number of 67, 000 geese recorded in Tibet is more than four times the estimate of 1993 for the same region and exceeds the most recent world population estimate of 52, 000-60, 000. Based on our work in Tibet and the latest wintering counts available from other areas, we revised the estimated population size of this species to 97, 000-118, 000.
Our result reveals a remarkable increase in the number of Bar-headed Geese wintering in south-central Tibet. This population increase most likely stems from a proliferation of cropland and especially winter wheat fields in south-central Tibet. This habitat improvement may also cause short-stopping of the Bar-headed Goose and thus reduce mortality of the geese that would otherwise undertake a somewhat daunting trans-Himalayan migration.
Bai W, Yao L, Zhang Y, Wang C. Spatial-temporal dynamics of cultivated land in recent 35 years in the Lhasa River Basin of Tibet. J Nat Res. 2014;29:623-32 (in Chinese).
Bishop MA, Li F. Effects of farming practices in Tibet on wintering Black-necked Crane (Grus nigricollis) diet and food availability. Biodivers Sci. 2002;10:393-8.
Bishop MA, Canjue Z, Song Y, Jim H, Gu B. Winter habitat use by Black-necked Cranes Grus nigricollis in Tibet. Wildfowl. 1998;49:228-41.
Bishop MA, Song Y, Canjue Z, Gu B. Bar-headed Geese Anser indicus wintering in south-central Tibet. Wildfowl. 1997;48:118-26.
Brown JD, Stallknecht DE, Swayne DE. Experimental infection of swans and geese with highly pathogenic avian influenza virus (H5N1) of Asian lineage. Emerg Infect Dis. 2008;14:136-42.
Chen H, Smith GJD, Zhang SY, Qin K, Wang J, Li K, Webster RG, Peiris JSM, Guan Y. Avian flu: H5N1 virus outbreak in migratory waterfowl. Nature. 2005;436:191-2.
Hawkes L, Balachandran AS, Batbayar N, Butler PJ, Frappell PB, Milsom WK, Tseveenmyadag N, Newman SH, Scott GR, Sathiyaselvam P, Takekawa JY, Wikelski M, Bishop CM. The trans-Himalayan flights of bar-headed geese (Anser indicus). Proc Natl Acad Sci. 2011;108:9516-9.
Li F, Nie H. Food analysis for wintering bar-headed goose in Caohai, Guizhou. Chin J Zool. 1998;3:29-33 (in Chinese).
Lu J. Notes on Bar-headed Geese in China. International Waterfowl Research Bureau Threatened Waterfowl Research Group News. 1991;1:8-9 (in Chinese).
Prosser DJ, Cui P, Takekawa JY, Tang M, Hou Y, Collins BM, Newman SH. Wild bird migration across the Qinghai-Tibetan plateau: a transmission route for highly pathogenic H5N1. PLoS ONE. 2011;6:e17622.
Takekawa JY, Heath SR, Douglas DC, Perry WM, Javed S, Newman SH, Suwal RN, Rahmani AR, Choudhury BC, Prosser DJ, Yan B, Hou Y, Batbayar N, Natsagdorj T, Bishop CM, Butler PJ, Frappell PB, Milsom WK, Scott GR, Hawkes LA, Wikelski M. Geographic variation in Bar-headed Geese Anser indicus: connectivity of wintering areas and breeding grounds across a broad front. Wildfowl. 2009;59:100-23.
Ven JVD, Gole P, Ouweneel G. Bar-headed Geese Anser indicus: notes from breeding and wintering areas. Goose Bull. 2010;10:7-17.
Yang F, Zhang Y. Quantities and distributions of the Black-necked Crane (Grus nigricollis) and other large waterfowls on the Yunnan and Guizhou Plateau. Zool Res. 2014;35:80-4.
Zhang G, Liu D, Hou Y, Jiang H, Dai M, Qian F, Lu J, Xing Z, Li F. Migration routes and stop-over sites determined with satellite tracking of Bar-headed Geese Anser indecus breeding at Qinghai Lake, China. Waterbirds. 2011;34(1):112-6.
The study was funded by the Wildlife Rescue Project from the Department of Wildlife Protection and Nature Reserve Management, State Forestry Administration (SFA) of China and the Project of Surveillance of H7N9 in Wild Birds (No. 201404404) from the Department of Science and Technology, SFA. The survey was also co-funded by the International Crane Foundation. We thank Langjie Wangqiu and Ding Dan for their assistance in the surveys the and Forestry Department of the Tibet Autonomous Region for their support in the field work. We thank Mary Anne Bishop, Beverly Pfister, Elena Smirenski and Jim Harris for improving the manuscript and Asad Rahmani, Simba Chan and Xingyao Zhong for their valuable information.
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