Contributions to the Breeding Biology of Larus argentatus and Larus fuscus

Bird-Banding ◽  
1952 ◽  
Vol 23 (1) ◽  
pp. 45
Author(s):  
D. S. Farner ◽  
Knud Paludan
Keyword(s):  
Breeding Biology ◽  
Larus Argentatus ◽  
Larus Fuscus

scholarly journals Population trends and status of four seabird species (Uria aalge, Alca torda, Larus fuscus, Larus argentatus) at Stora Karlsö in the Baltic Sea

Ornis Svecica ◽  
2017 ◽  
Vol 27 (2–4) ◽  
Author(s):  
Olof Olsson ◽  
Jonas Hentati-Sundberg
Keyword(s):  
Baltic Sea ◽  
Larus Argentatus ◽  
Herring Gull ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
Alca Torda ◽  
Seabird Species ◽  
Larus Fuscus ◽  
The Baltic ◽  
Annual Decline

The island of Stora Karlsö hosts the largest colonies of fish-eating seabirds in the Baltic Sea. However, recent and reliable estimates of the number of breeding pairs of the main species have been missing. Based on a complete census in 2014, we estimated the number of Common Guillemots Uria aalge to 15,700 pairs, more than half (up to 70%) of the Baltic Sea population. The number has almost tripled since the early 1970s and the increase has been particularly strong the last 11 years, with an annual increase of 5.1%. We counted 24,600 individual adult Razorbills Alca torda and estimated it to correspond to a maximum of 12,300 pairs in 2015–2016 (census over two seasons). The colony has grown strongly; on average by 5.6% annually since the early 1970s, and Stora Karlsö now hosts up to 30% of the Baltic Sea population. Stora Karlsö also hosts colonies with about 300 pairs each of Lesser Black-backed Gull Larus fuscus and Herring Gull Larus argentatus. The gulls’ trends are negative, with an average annual decline the last 10-year period by 5.0% and 6.2%, respectively.

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