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The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Whooper Swan Cygnus cygnus	LC	passage	2003	present	A4i
Brent Goose Branta bernicla	LC	passage	2003	present	A4i
Bean Goose Anser fabalis	LC	winter	2003	present	A4i
Common Goldeneye Bucephala clangula	LC	winter	2003	present	A4i
Greater Scaup Aythya marila	LC	winter	2003	present	A4i
Eurasian Wigeon Mareca penelope	LC	winter	2003	present	A4i
Red-crowned Crane Grus japonensis	VU	breeding	2003	present	A1, A3, A4i
Ruddy Turnstone Arenaria interpres	NT	passage	2003	present	A4i
Red-necked Stint Calidris ruficollis	NT	passage	2003	present	A4i
Latham's Snipe Gallinago hardwickii	NT	breeding	2003	present	A3
Grey-tailed Tattler Tringa brevipes	LC	passage	2003	present	A4i
Steller's Sea-eagle Haliaeetus pelagicus	VU	winter	2003	present	A1
Middendorff's Grasshopper-warbler Helopsaltes ochotensis	LC	breeding	2003	present	A3
Sakhalin Grasshopper-warbler Helopsaltes amnicola	LC	breeding	2003	present	A3

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2004) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2004. The most recent assessment (2015) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Forest	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Transportation and service corridors	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Geological events	happening now	small area/few individuals (<10%)	moderate to rapid deterioration	low
Invasive and other problematic species and genes	happening now	small area/few individuals (<10%)	slow but significant deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Whole area of site (>90%) covered by appropriate conservation designation	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

Year	Protected Area	Designation	% overlap with IBA
1962	Notsuke furen	都道府県立自然公園	39
1980	Barasanto	都道府県指定鳥獣保護区	1
1984	Onneto	都道府県指定鳥獣保護区	2
1992	Hattaushi	都道府県指定鳥獣保護区	<1
1993	Furenko	国指定鳥獣保護区	31
2005	Furen-ko and Shunkuni-tai	Ramsar Site, Wetland of International Importance	25

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		major (>10)
Marine Intertidal		major (>10)
Shrubland		major (>10)
Forest		minor (<10)

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lake Furen, On-netou (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/lake-furen-on-netou-iba-japan on 22/11/2024.