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Location Taiwan (China), Chiayi,Yulin
Central coordinates 120o 10.00' East  23o 29.00' North
IBA criteria A1, A4i, A4iii
Area 13,880 ha
Altitude 0 - 1m
Year of IBA assessment 2004

Chinese Wild Bird Federation

Site description Extent of this site: comprised of the downstream section of the Beigang River, its estuary and sand flats and the southern shore of the Dapai River Estuary at Taiwan Sugar Corp. (Taisugar)’s Dongshih Farms and Liujiao. In the north is the north edge of the Beigang River estuary and includes the aquatic areas of Tongshanzhou, Botsiliaoshan, and Waishandingzhou; the border in the south is Liujiao’s Dapai River estuary; the eastern border is Provincial Highway 17; and to the west is the Taiwan Strait. Within the site, the Dongshih and the Aogu Farms are seaside reclaimed, cultivated land belonging to Taisugar. The environment of the farms is both complex and diverse. During the areas early development period, 800 x 800 m fields were laid out, with each bordered by water supply ditches and canals, all of which was surrounded by wind-protection forests. The eastern and central portions of the site are mostly sugar cane fields. On the west, against the sea is a broad, vast marshland; to the south is a vast saltwater lake with Kandelia Kandelia candel and Black Mangrove Avicennia manna; to the northeast are freshwater ponds; the north edge is a roosting area for Egrets. Because of the environmental diversity, this IBA site absolutely is important habitat for wild birds. Besides the habitats of cultivated lands, grassy marshes, and ponds, about half of the remainder is made up of coastal sand flats in a vast estuarine tidal zone formed by estuaries of Liujiao’s Dapai River, the Beigang River and other rivers.

Key Biodiversity IBA criterion A1 species: Black-faced Spoonbill Time Jan. 1994 Jan. 1995 Mar. 1996 Dec. 1997 Jan. 1998 May 1999 May 2000 Jan. 2001 No. of BFS 2 8 No data 2 2 9 7 3 Record of Saunders’s Gull during 1989 and 2001: (of the estimated 2,000 Saunders’s Gull in the world, about 100 in this area) Time 1989 Jan. 1993 Dec. 1994 Jan. 1995 Jan. 1996 Jan. 1997 Dec. 1998 Dec. 1999 Jan. 1999 Nov. 2000 Feb. 2001 Jan. No. of SG 20 80 10 33 114 25 150 112 22 26 75 IBA A4i criterion species: Great Cormorants Year 1991 Jan. 1993 Feb. 1994 Jan. 1995 Jan. 1995 Dec. 1996 Feb. 1996 Nov. 1997 Nov. 1998 Jan. 1999 Jan. 1999 Dec. 2000 Jan. 2001 Jan. No. 186 136 210 210 300 600 1000 800 230 196 650 328 198 • A total of 223 species have been recorded here, including 22 protected species: Chinese Egret, 5 birds; Greater Spotted Eagle, Black-faced Spoonbill, Black Stork, Osprey, Painted Snipe, Little Tern and Brown Shrike. • It is worth mentioning the Black-winged Stilt, whose nests are supported by the natural growth in the grassy marshes; 1994 was the first year that 10 pairs were discovered breeding here, with subsequent stable growth in their numbers: 1995, 55 birds; 1996, 144 birds; 1997, 83 birds; 1998, 82 birds; 1999, 300 birds; and 2000, 100 birds. So it is evident that this area is important for this growing species, and although the numbers do not reach the IBA criteria, there is potential for the future.

Non-bird biodiversity: • At this site, 290 species of plants have been identified, with the only surviving mangrove being Black Mangrove Avicennia marina.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Black-faced Spoonbill Platalea minor winter  1994-2001  2-9 individuals  good  A1  Endangered 
Saunders's Gull Saundersilarus saundersi winter  1989-2001  10-150 individuals  good  A1, A4i  Vulnerable 
A4iii Species group - waterbirds unknown  20,000 individuals  unknown  A4iii   


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland)   major
Artificial - terrestrial   minor
Sea   major

Land use

Land-use Extent (% of site)
other 68%
Notes: Added based on Wild Bird Federation of Taiwan 2001. Important Bird Areas of Taiwan. Taipei:WBFT.
not utilised 17%
Notes: Added based on Wild Bird Federation of Taiwan 2001. Important Bird Areas of Taiwan. Taipei:WBFT.
agriculture 10%
Notes: Added based on Wild Bird Federation of Taiwan 2001. Important Bird Areas of Taiwan. Taipei:WBFT.
water management 6%
Notes: Added based on Wild Bird Federation of Taiwan 2001. Important Bird Areas of Taiwan. Taipei:WBFT.

References • Kaohsiung Wild Bird Society. 1994. Bird investigations on the wetlands along the southwesten coast in Taiwan. Council ofAgriculture. Executive Yuan. • Wetlands Conservation Workgroup. 1994. 1994 Planning examples of the environmentally sensitive areas at the coast of Taiwan- bird, mangrove, and wetland investigations. Environmental Protection Administration, Executive Yuan, Taiwan. • Weng, R. H. Personal unpublished data. Wetlands Taiwan. Bird Database. • Wild Bird Society of Kaohsiung. 1995. 1995 Final report on the conservation area demonstration plan of the coastal environmentally sensitive areas- proposed strategies for the planning of Aogu Wetlands, Chiayi County. Environmental Protection Administration. • Cheng, C. C. and R. Z. Chen. 1995. Analysis of bird communities at Aogu. Proceedings of the Second Coastal and Wetland Conservation Conference. WBFT. • Geography Institute, National Taiwan University. 1995. Investigations and research on the sensitive areas of coastal wetlands, sand dunes, sand flats, and lagoons- investigation and analysis of the coast resources and environmental factors of the western Taiwan. Environmental Protection Administration. • Wetlands Taiwan. 1999. Instructive Manual of the Coastal Wetlands of Southwestern Taiwan. Council of Agriculture, Executive Yuan.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Aogu Wetlands. Downloaded from on 21/10/2016

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