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Location Japan, Shiga
Central coordinates 136o 5.00' East  35o 15.00' North
IBA criteria A4i, A4iii
Area 72,224 ha
Altitude 0 - 85m
Year of IBA assessment 2004

Wild Bird Society of Japan

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Falcated Duck Mareca falcata winter  2004  present  A4i  Near Threatened 
Eurasian Wigeon Mareca penelope winter  2004  present  A4i  Least Concern 
Common Pochard Aythya ferina winter  2004  present  A4i  Least Concern 
Tufted Duck Aythya fuligula winter  2004  present  A4i  Least Concern 
A4iii Species group - waterbirds winter  2004  min 20,000 individuals  A4iii   

IBA Monitoring

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

Pollution domestic & urban waste water - type unknown/unrecorded likely in long term (beyond 4 years) majority/most of area/population (50-90%) 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90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Unknown  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Biwa-ko Wetlands of International Importance (Ramsar) 65,602 protected area contained by site 65,602  
Biwako Prefectural Wildlife Protection Area 69,546 unknown 0  
Biwako Quasi National Park 97,601 unknown 0  


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

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Recommended citation  BirdLife International (2015) Important Bird Areas factsheet: Lake Biwako. Downloaded from on 18/04/2015

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