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The site was identified as internationally important for bird conservation 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 List	Season (year/s of estimate)	Size	IBA criteria
Whooper Swan Cygnus cygnus	LC	passage (1996)	700–900 birds	A4i, B1i, C2
Greylag Goose Anser anser	LC	passage (1996)	1,800–2,000 birds	B1i, C3
Bean Goose Anser fabalis	LC	passage (1996)	1,500–2,000 birds	B1i, C3
Northern Pintail Anas acuta	LC	passage (1996)	400–500 birds	B1i, C3
Common Teal Anas crecca	LC	passage (1996)	6,000–7,000 birds	B1i, C3
Red-necked Grebe Podiceps grisegena	LC	breeding (1996)	40–60 pairs	B1i, C3
Spotted Crake Porzana porzana	LC	breeding (1996)	5–25 pairs	C6
Common Crane Grus grus	LC	passage (1996)	6,000–10,000 birds	A4i, B1i, C2
Eurasian Bittern Botaurus stellaris	LC	breeding (1996)	10–14 pairs	B2, C6
Black Tern Chlidonias niger	LC	breeding (1996)	25–45 pairs	C2, C6
Western Marsh-harrier Circus aeruginosus	LC	breeding (1996)	20–35 pairs	C6
Common Grasshopper-warbler Locustella naevia	LC	breeding (1996)	30–50 pairs	B3
A4iv Species group - soaring birds/cranes	n/a	passage (1996)	min 10,000 birds	B1iv, C5

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%)	good
Grassland	good (>90%)	good (>90%)	good

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Natural system modifications	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Human intrusions and disturbance	happe­ning now	few indivi­duals/small area (<10%)	slow decline (1–10% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Most of area (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 (management category)	% coverage of IBA
1974	Fageluddens	Nature Reserve (-)	<1
1974	Fågeludden, Hornborga	Nature Reserve (IV)	<1
1992	Bjurum - Dagsnäs	Nature Reserve (IV)	2
2011	Hornborgasjön	Naturreservat (IV)	61
2013	Mårbykärret	Naturreservat (IV)	<1

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

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 23/12/2024.