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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	230-1,040 individuals	B1i, B3
Barnacle Goose Branta leucopsis	LC	passage	2004-2013	671-1,500 individuals	B1i
Pink-footed Goose Anser brachyrhynchus	LC	passage	2004-2013	260-1,700 individuals	B1i
Common Teal Anas crecca	LC	passage	2004-2013	1,265-5,400 individuals	B1i
Eurasian Curlew Numenius arquata	NT	passage	2004-2014	11-292 individuals	A1
Osprey Pandion haliaetus	LC	breeding	2004-2013	6-9 breeding pairs	B2

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	1,040	715	individuals	69	unfavourable
Barnacle Goose Branta leucopsis	2,200	2,164	individuals	99	favourable
Pink-footed Goose Anser brachyrhynchus	1,700	350	individuals	21	very unfavourable
Eurasian Wigeon Mareca penelope	800	738	individuals	93	favourable
Anas crecca	1,265	2,020	individuals	100	favourable
Corncrake Crex crex	1	1	individuals	100	favourable
Eurasian Curlew Numenius arquata	292	333	individuals	100	favourable
Osprey Pandion haliaetus	9	9	breeding pairs	100	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Natural system modifications	happening now	whole area/population (>90%)	very rapid to severe deterioration	very high
Human intrusions and disturbance	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
Climate change and severe weather	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Pollution	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Agricultural expansion and intensification	likely in long term (beyond 4 years)	small area/few individuals (<10%)	slow but significant deterioration	low
Biological resource use	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
Whole area of site (>90%) covered by appropriate conservation designation	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	medium

Year	Protected Area	Designation	% overlap with IBA
1975	Nordre Øyeren	Naturreservat	98
1985	Nordre Oyeren	Ramsar Site, Wetland of International Importance	98
1992	Sørumsneset	Naturreservat	2

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Standing freshwater, Rivers and streams	90
Artificial/Terrestrial	Arable land	5
Forest	Broadleaved deciduous woodland, Native coniferous woodland, Mixed woodland	5

1. IUCN Habitat classification.

Land use	% of IBA
tourism/recreation	90
water management	90
hunting	50
agriculture	5

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Nordre Øyeren & Sørumsneset (Norway). Downloaded from https://datazone.birdlife.org/site/factsheet/nordre-øyeren-&-sørumsneset-iba-norway on 23/11/2024.