email a friend
printable version
Location Japan, Hokkaido
Central coordinates 141o 45.00' East  42o 39.00' North
IBA criteria A4i
Area 7,200 ha
Altitude 0 - 10m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Yufutsu plain is located in the southwest of Hokkaido, and is a wetland formed by the peat bed with the volcanic ash fall pile. In the lakes and marshes grow aquatic plants such as Zizania latifolis surrounded by grassland of Phragmites australis, Calamagrostis langsdorffii and shrub of Alnus japonica. Secondary forests of Quercus serrata and Quercus crispula are found around there.

Populations of IBA trigger species

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

IBA Monitoring

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

Agriculture and aquaculture annual & perennial non-timber crops - agro-industry farming likely in long term (beyond 4 years) some of area/population (10-49%) slow but significant deterioration medium

Little/none of site covered (<10%)  A management plan exists but it is out of date or not comprehensive  Unknown  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Utonai-ko Wetlands of International Importance (Ramsar) 510 protected area contained by site 510  
Utonaiko National Wildlife Special Protected Area 510 is identical to site 510  


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

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Lake Utonai, Yufutu plain. Downloaded from on 28/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife