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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
Swinhoe's Rail Coturnicops exquisitus	LC	breeding	2003	present	A1
Schrenck's Bittern Ixobrychus eurhythmus	LC	breeding	2003	present	A3
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
Marine Coastal/Supratidal	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	happening now	some of area/population (10-49%)	very rapid to severe deterioration	high
Biological resource use	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Energy production and mining	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Invasive and other problematic species and genes	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Pollution	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Human intrusions and disturbance	happening now	some of area/population (10-49%)	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%)	A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	low

Year	Protected Area	Designation	% overlap with IBA
2005	Hotokenuma	国指定鳥獣保護区	4
2005	Hotokenuma	Ramsar Site, Wetland of International Importance	2

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

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Hotokenuma, Lake Ogawara and nearby lakes (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/hotokenuma-lake-ogawara-and-nearby-lakes-iba-japan on 22/11/2024.