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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 Teal Anas crecca	LC	winter	2003	present	A4i
Pacific Golden Plover Pluvialis fulva	LC	passage	2003	present	A4i
Little Ringed Plover Charadrius dubius	LC	breeding	2003	present	A4i
Marsh Grassbird Helopsaltes pryeri	NT	breeding	2003	present	A1, A3
Ochre-rumped Bunting Emberiza yessoensis	NT	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
Wetlands (inland)	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Biological resource use	happening now	some of area/population (10-49%)	very rapid to severe deterioration	high

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	No management plan exists but the management planning process has begun	Some limited conservation initiatives are in place	low

Year	Protected Area	Designation	% overlap with IBA
1956	Edozaki	都道府県指定鳥獣保護区	2
1959	Suigo-Tsukuba	国定公園	100
1960	Ukishima	都道府県指定鳥獣保護区	<1
1962	Ushibori chisaki	都道府県指定鳥獣保護区	6
1966	Ayumisaki	都道府県指定鳥獣保護区	3
1972	Kasumigaura	都道府県指定鳥獣保護区	27
1981	Takahamairi	都道府県指定鳥獣保護区	2

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Freshwater lakes and pools, Permanent swamps	-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lake Kasumigaura, Ukisima (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/lake-kasumigaura-ukisima-iba-japan on 22/11/2024.