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The site was identified as internationally important for bird conservation in 2007 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 (2000–2006)	50–200 birds	B1i, C2
Smew Mergellus albellus	LC	winter (2000–2006)	25–125 birds	C2, C6

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2007. The most recent assessment (2007) is shown below.

State (condition of the trigger species' populations)
Species	Actual vs Reference (units)	% remaining	Result
Whooper Swan Cygnus cygnus	125 / 200 (birds)	63	poor
Smew Mergellus albellus	100 / 200 (birds)	50	poor

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Grassland	-	poor (40–69%)	very poor
Marine Neritic	-	moderate (70–90%)	moderate
Marine Coastal/Supratidal	-	moderate (70–90%)	moderate

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Natural system modifications	happe­ning now	most of popul­ation/area (50–90%)	rapid decline (>30% over 3 gener­ations)	very high
Pollution	happe­ning now	most of popul­ation/area (50–90%)	moderate decline (10–30% over 3 gener­ations)	high
Energy production and mining	happe­ning now	some of popul­ation/area (10–49%)	rapid decline (>30% over 3 gener­ations)	high
Human intrusions and disturbance	happe­ning now	some of popul­ation/area (10–49%)	moderate decline (10–30% over 3 gener­ations)	high

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Some of area covered (10–49%)	A compre­hensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	Some limited conservation initiatives are in place	low

The Local Conservation Group(s) listed below are working to conserve this IBA.

Name	Year formed
Föreningen Torslandavikens Naturreservat	0
Göteborgs ornitologiska förening	0

For more information on BirdLife's work with Local Conservation Groups, please visit Spotlight on local empowerment.

Habitat	% of IBA	Habitat detail
Marine Neritic	30
Artificial/Terrestrial	21	Other urban and industrial areas; Ruderal land; Arable land
Shrubland	5	Scrub
Grassland	4	Mesophile grasslands
Marine Coastal/Supratidal	major (>10)
Marine Intertidal	major (>10)

Land use	% of IBA
urban/industrial/transport	50
nature conservation and research	45
agriculture	5

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Bay of Torslanda (Sweden). Downloaded from https://datazone.birdlife.org/site/factsheet/bay-of-torslanda-iba-sweden on 23/12/2024.