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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
Common Pochard Aythya ferina	VU	winter	2003	present	A4i
Greater Scaup Aythya marila	LC	winter	2003	present	A4i
Falcated Duck Mareca falcata	LC	winter	2003	present	A4i
Little Tern Sternula albifrons	LC	breeding	1994	min 1,200 nests	A4i
A4iii Species group - waterbirds	n/a	winter	2003	min 20,000 individuals	A4iii

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 (2010) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Pollution	likely in long term (beyond 4 years)	majority/most of area/population (50-90%)	slow but significant deterioration	medium

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Little/none of site covered (<10%)	Unknown	Unknown	negligible

Year	Protected Area	Designation	% overlap with IBA
1950	Hamana ko	都道府県立自然公園	92
1965	Shizuoka Prefectural Fisheries Coordination Regulations Article35(1) the second row of the table	保護水面	<1
1965	Shizuoka Prefectural Fisheries Coordination Regulations Article35(1) the first row of the table	保護水面	<1
1968	Omaezaki enshunada	都道府県立自然公園	4
1970	Hosoe ko shuhen	都道府県指定鳥獣保護区	6
1971	Kanzanji	都道府県指定鳥獣保護区	1
1972	Enshunada	都道府県指定鳥獣保護区	4
1973	Matsumigaura	都道府県指定鳥獣保護区	1
1979	Tenryugawa isei enshunada	都道府県指定鳥獣保護区	9
1987	Inohanako	都道府県指定鳥獣保護区	7
2003	Common fishery right area(Shizuoka)	共同漁業権区域	81

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

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lake Hamanako, Enshunada (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/lake-hamanako-enshunada-iba-japan on 23/11/2024.