• Summary
• Text account
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The site was identified as important in 2000 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	1996	700-900 individuals	A4i, B1i, C2
Greylag Goose Anser anser	LC	passage	1996	1,800-2,000 individuals	B1i, C3
Bean Goose Anser fabalis	LC	passage	1996	1,500-2,000 individuals	B1i, C3
Northern Pintail Anas acuta	LC	passage	1996	400-500 individuals	B1i, C3
Common Teal Anas crecca	LC	passage	1996	6,000-7,000 individuals	B1i, C3
Red-necked Grebe Podiceps grisegena	LC	breeding	1996	40-60 breeding pairs	B1i, C3
Spotted Crake Porzana porzana	LC	breeding	1996	5-25 breeding pairs	C6
Common Crane Grus grus	LC	passage	1996	6,000-10,000 individuals	A4i, B1i, C2
Eurasian Bittern Botaurus stellaris	LC	breeding	1996	10-14 breeding pairs	B2, C6
Black Tern Chlidonias niger	LC	breeding	1996	25-45 breeding pairs	C2, C6
Western Marsh-harrier Circus aeruginosus	LC	breeding	1996	20-35 breeding pairs	C6
Common Grasshopper-warbler Locustella naevia	LC	breeding	1996	30-50 breeding pairs	B3
A4iv Species group - soaring birds/cranes	n/a	passage	1996	min 10,000 individuals	B1iv, C5

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2000) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2000. The most recent assessment (2018) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Wetlands (inland)	good (> 90%)	good (> 90%)	favourable
Grassland	good (> 90%)	good (> 90%)	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%)	slow but significant deterioration	medium
Natural system modifications	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Human intrusions and disturbance	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
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	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	medium

Year	Protected Area	Designation	% overlap with IBA
1974	Hornborgasjön	Ramsar Site, Wetland of International Importance	100
1974	Fageluddens	Nature Reserve	<1
1974	Fågeludden, Hornborga	Nature Reserve	<1
1992	Bjurum-Dagsnäs	Djur- och växtskyddsområde	30
1992	Bjurum - Dagsnäs	Nature Reserve	2
1996	Hornborgasjön	Site of Community Importance (Habitats Directive)	60
1996	Rösjö mosse och Mårbysjön	Special Protection Area (Birds Directive)	1
2003	Rösjö mosse och Mårbysjön	Site of Community Importance (Habitats Directive)	1
2006	Hornborgasjön	Special Protection Area (Birds Directive)	62
2011	Hornborgasjön	Naturreservat	61
2013	Mårbykärret	Naturreservat	<1

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Standing freshwater, Raised bogs, Water fringe vegetation	50
Artificial/Terrestrial	Arable land	20
Forest	Native coniferous woodland, Mixed woodland	15
Grassland	Dry siliceous grassland, Humid grasslands	15

1. IUCN Habitat classification.

Land use	% of IBA
nature conservation and research	60
agriculture	30
forestry	5
tourism/recreation	5

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lake Hornborga (Sweden). Downloaded from https://datazone.birdlife.org/site/factsheet/lake-hornborga-iba-sweden on 22/11/2024.