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The site was identified as important 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 List1	Season	Year(s)	Size	IBA criteria
Whooper Swan Cygnus cygnus	LC	winter	1995	2,000 individuals	A4i, B1i, B3, C2, C6
Brent Goose Branta bernicla	LC	non-breeding	1994	3,500 individuals	A4i, B1i, C3
Common Shelduck Tadorna tadorna	LC	non-breeding	1994	5,470-5,670 individuals	A4i, B1i, C3
A4iii Species group - waterbirds	n/a	non-breeding	1999	min 20,000 individuals	A4iii, C4

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2000) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2000. The most recent assessment (2010) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Tundra Swan Cygnus columbianus	97	5	individuals	6	very unfavourable
Barnacle Goose Branta leucopsis	3,500	84	individuals	3	very unfavourable
Melanitta nigra	54,000	5,300	individuals	10	very unfavourable
Melanitta fusca	20,000	1,000	individuals	5	very unfavourable
Common Goldeneye Bucephala clangula	4,000	2,500	individuals	63	unfavourable
Greater Scaup Aythya marila	11,600	5,000	individuals	44	unfavourable
Great Cormorant Phalacrocorax carbo	5,000	5,000	individuals	100	favourable
Eurasian Golden Plover Pluvialis apricaria	19,060	19,060	individuals	100	favourable
Black-headed Gull Larus ridibundus	17,600	17,600	individuals	100	favourable
Sandwich Tern Thalasseus sandvicensis	173	173	breeding pairs	100	favourable
Red-backed Shrike Lanius collurio	2	2	breeding pairs	100	favourable

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation	% overlap with IBA
1977	Randers and Mariager Fjords and the adjacent sea	Ramsar Site, Wetland of International Importance	100
1983	Randers og Mariager Fjorde og Ålborg Bugt; sydlige del	Special Protection Area (Birds Directive)	74
1992	Mariagerfjord Kommune	§3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv)	<1
1998	Ålborg Bugt; Randers Fjord og Mariager Fjord	Site of Community Importance (Habitats Directive)	62
2001	Ajstrup Bugt	Fredet ved afgørelse, exl. Kirkeomgivelser	2
2005	Ålborg Bay, Randers Fjord and Mariager Fjord	Baltic Sea Protected Area (HELCOM)	64
2009	Ålborg Bugt, Randers Fjord og Mariager Fjord	Marine Protected Area (OSPAR)	37

Habitat1	Habitat detail	% of IBA
Artificial/Terrestrial	Arable land	50
Forest		15
Marine Intertidal		major (>10)
Marine Neritic		major (>10)

1. IUCN Habitat classification.

Land use	% of IBA
agriculture	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Parts of Randers and Mariager Fjords (Denmark). Downloaded from https://datazone.birdlife.org/site/factsheet/parts-of-randers-and-mariager-fjords-iba-denmark on 23/11/2024.