Lake Nakaumi

IBA Justification

Year of most recent IBA criteria assessment: 2004

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population at site IBA criteria triggered
Tundra Swan Cygnus columbianus LC winter 2003 present A4i
Common Pochard Aythya ferina VU winter 2003 present A4i
Tufted Duck Aythya fuligula LC winter 2003 present A4i
Greater Scaup Aythya marila LC winter 2003 present A4i
A4iii Species group - waterbirds n/a winter 2003 50,000-75,000 individuals A4iii

Note: The current IUCN Red List category may differ from the category that was valid at the time of IBA criteria assessment.

For more information about the IBA criteria, please click here

IBA Conservation

IBA conservation status - summary
Year of assessment (most recent) Threat (pressure) Condition (state) Action (response)
2015 medium near favourable high
Was the whole site assessed? yes Condition (state) assessed by habitat
Accuracy of information -

Threats to the site (pressure)
Threat level 1 Threat level 2 Timing Scope Severity Result
Natural system modifications other ecosystem modifications happening now small area/few individuals (<10%) moderate to rapid deterioration low
Transportation and service corridors roads and railroads happening now some of area/population (10-49%) slow but significant deterioration medium

Condition of the site (state), by habitat
Habitat Habitat detail Reference area (ha) Actual area (ha) Habitat quantity (% remaining) Habitat quality (carrying capacity) Result
Wetlands (inland) 0 0 good (> 90%) moderate (70-90%) near favourable

Conservation actions taken at the site (response)
Protected-area designation Management planning Other conservation action Result
Most of site (50-90%) covered (including the most critical parts for important bird species) A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species The conservation measures needed for the site are being comprehensively and effectively implemented high
For more information about IBA conservation status, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Nakaumi Prefectural Wildlife Protection Area 8,800 protected area contained by site 8,800
Nakaumi 国指定鳥獣保護区 8,724 protected area overlaps with site 8,462
Nakaumi Ramsar Site, Wetland of International Importance 8,043 protected area contained by site 8,043


IUCN Habitat Habitat detail Extent (% of site)
Marine Coastal/Supratidal -
For further information about the IUCN habitat classification, please click here.

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Lake Nakaumi. Downloaded from on 29/05/2023.