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Location Japan, Hokkaido
Central coordinates 141o 41.00' East  42o 54.00' North
IBA criteria A4i
Area 130 ha
Altitude 0 - 5m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Kyuosatunuma is a farm drainage that is 2 km long and 130 m wide, located at the border of Chitose City and Naganuma Town, and flows into the Chitosegawa river. The whole area was the vast swampland before, with the name of Osatsunuma. But the drainage works have formed the present appearance. The water is shallow and Zizania latifolis and Trapa japonica are distributed. At the southwest side there is a 30ha grassland, mostly of Phragmites australis and Solidago virgaurea var. asiatica. It is surrounded by Salix (myrtilloides), Sambucus racemosa ssp. and windbreak forests of Betula platyphylla var. japonica and Fraxinus mandshurica. Surrounding farms rotate crops of wheat, beans, sugar beet and other vegetables.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bean Goose Anser fabalis passage  2004  present  A4i  Least Concern 
Greater White-fronted Goose Anser albifrons passage  2004  present  A4i  Least Concern 
Tundra Swan Cygnus columbianus winter  2004  present  A4i  Least Concern 

IBA Monitoring

2010 medium not assessed negligible
Poor - based on little, or potentially unreliable/unrepresentative, data

Human intrusions and disturbance recreational activities likely in long term (beyond 4 years) whole area/population (>90%) slow but significant deterioration medium

Little/none of site covered (<10%)  No management planning has taken place  Unknown  negligible 


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Freshwater lakes and pools  -
Artificial - terrestrial Rice paddies  -

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Recommended citation  BirdLife International (2015) Important Bird Areas factsheet: Kyu-Osatsunuma. Downloaded from on 13/10/2015

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