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• Text account
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• Reference and further resources

The site was identified as important in 2014 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	winter	2004-2013	200-600 individuals	B1i, B3
Pink-footed Goose Anser brachyrhynchus	LC	passage	2004-2013	5,000-12,000 individuals	A4i, B1i

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2014) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2014. The most recent assessment (2020) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Whooper Swan Cygnus cygnus	600	850	individuals	100	favourable
Pink-footed Goose Anser brachyrhynchus	12,000	17,000	individuals	100	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Human intrusions and disturbance	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Pollution	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Climate change and severe weather	happening now	whole area/population (>90%)	slow but significant deterioration	high
Transportation and service corridors	likely in short term (within 4 years)	some of area/population (10-49%)	moderate to rapid deterioration	medium
Residential and commercial development	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Invasive and other problematic species and genes	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Agricultural expansion and intensification	happening now	some of area/population (10-49%)	no or imperceptible deterioration	low
Biological resource use	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low

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90%) covered by appropriate conservation designation	A management plan exists but it is out of date or not comprehensive	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	medium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
1954	Tyrifjorden	Dyrelivsfredning	9
1975	Lamyra	Naturreservat	1
1985	Averøya	Naturreservat	3
1985	Karlsrudtangen	Naturreservat	3
1985	Synneren	Naturreservat	2
1985	Juveren	Naturreservat	1
1988	Ullerntangen	Naturreservat	<1
1988	Lemostangen	Naturreservat	<1
1988	Vinterguten	Naturreservat	<1
1996	Nordre Tyrifjord Wetlands System	Ramsar Site, Wetland of International Importance	10

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Mud flats and sand flats, Rivers and streams, Standing freshwater, Water fringe vegetation	major (>10)

1. IUCN Habitat classification.

Land use	% of IBA
tourism/recreation	major (>10)
nature conservation and research	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Tyrifjord wetland system (Norway). Downloaded from https://datazone.birdlife.org/site/factsheet/tyrifjord-wetland-system-iba-norway on 23/11/2024.