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Location Japan, Hokkaido
Central coordinates 143o 31.00' East  44o 15.00' North
IBA criteria A4i
Area 1,516 ha
Altitude 0 - 5m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Lake Komukeko consists of three major water bodies, and the largest part is connected to the sea by an artificial stream. Vast wetlands appear when tide is low. The sea and the lakes are divided by a coastal sand bar. Salicornia europaes is pretty in autumn on the lakeshore. The lake is surrounded by reed beds and outside of the reed beds are farmlands and woodlands. Two low water rivers flow into the lake. There is a floodgate at the entrance of Lake Shibunotsunai, but when there are storms, there is seawater intrusion into the lake. The lake is also surrounded by reed beds and farmlands.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta passage  2004  present  A4i  Least Concern 
Eurasian Wigeon Mareca penelope passage  2004  present  A4i  Least Concern 
Whimbrel Numenius phaeopus passage  2004  present  A4i  Least Concern 
Red-necked Stint Calidris ruficollis passage  2004  present  A4i  Near Threatened 

IBA Monitoring

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

Pollution agricultural & forestry effluents - type unknown/unrecorded likely in long term (beyond 4 years) some of area/population (10-49%) slow but significant deterioration medium

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  medium 


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Coastal lagoons  -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Lakes Komuke and Shibunotsunai. Downloaded from on 26/10/2016

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