Data Zone
The site was identified as internationally important for bird conservation 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 List | Season (year/s of estimate) | Size | IBA criteria |
|---|---|---|---|---|
| Whooper Swan Cygnus cygnus | LC | winter (2004–2013) | 200–600 birds | B1i, B3 |
| Pink-footed Goose Anser brachyrhynchus | LC | passage (2004–2013) | 5,000–12,000 birds | A4i, B1i |
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.
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2020 | good | high | medium |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | good | |
| State (condition of the trigger species' populations) | |||||
|---|---|---|---|---|---|
| Species | Actual vs Reference (units) | % remaining | Result | ||
| Whooper Swan Cygnus cygnus | 850 / 600 (birds) | 100 | good | ||
| Pink-footed Goose Anser brachyrhynchus | 17,000 / 12,000 (birds) | 100 | good | ||
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Climate change and severe weather | happening now | whole of population/area (>90%) | slow decline (1–10% over 3 generations) | high |
| Pollution | happening now | most of population/area (50–90%) | slow decline (1–10% over 3 generations) | high |
| Human intrusions and disturbance | happening now | some of population/area (10–49%) | moderate decline (10–30% over 3 generations) | high |
| Residential and commercial development | happening now | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Invasive and other problematic species and genes | happening now | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Transportation and service corridors | likely in short term (<4 years) | some of population/area (10–49%) | moderate decline (10–30% over 3 generations) | medium |
| Agricultural expansion and intensification | happening now | some of population/area (10–49%) | no or slight decline (<1% over 3 generations) | low |
| Biological resource use | happening now | few individuals/small area (<10%) | no or slight decline (<1% over 3 generations) | low |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Whole area (>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 (management category) | % coverage of IBA |
|---|---|---|---|
| 1975 | Lamyra | Naturreservat (Ia) | 1 |
| 1985 | Averøya | Naturreservat (Ia) | 3 |
| 1985 | Karlsrudtangen | Naturreservat (Ia) | 3 |
| 1985 | Synneren | Naturreservat (Ia) | 2 |
| 1985 | Juveren | Naturreservat (Ia) | 1 |
| 1988 | Ullerntangen | Naturreservat (Ia) | <1 |
| 1988 | Vinterguten | Naturreservat (Ia) | <1 |
| 1988 | Lemostangen | Naturreservat (Ia) | <1 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Wetlands (inland) | major (>10) | Mud flats and sand flats; Rivers and streams; Standing freshwater; Water fringe vegetation |
| Land use | % of IBA |
|---|---|
| tourism/recreation | major (>10) |
| nature conservation and research | - |
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 23/12/2024.