Conservation measures for the Caspian Tern Hydroprogne caspiaat the largest colony in Sweden

Ulrik Lötberg, Natalie Isaksson, Lennart Söderlund, Susanne Åkesson

Research output: Contribution to journalArticlepeer-review


WE PRESENT CONSERVATI ON ACTI ONS during 2007–2020 as part of the national Caspian Tern Hydroprogne caspia species action plan at Stenarna in the Björn archipelago, Uppland, the largest colony in Sweden. We applied a combination of monitoring, research, and management measures conducted within an adaptive approach frame-work, using both established and novel techniques. The implementation of conservation measures led to increased breeding success, from 0 fledglings per pair in 2007 to 1.3 in 2020. A surveillance video camera installed in 2009 aided in monitoring efforts and also revealed predation by Herring Gull Larus argentatus and White-tailed Eagle Haliaeetus albicilla, leading to species-specific control strategies. Management of the island and surrounding archi-pelago, including hunting of invasive American mink Mustela vison, vegetation removal, and habitat restoration after a severe storm, have also been instrumental to the success of the project. Implementation of projects such as this have the potential to improve conditions for continued viability of endangered species in a changing world and are likely to be useful to other conservation practitioners.

Translated title of the contributionBevarande av skräntärnan Hydroprogne caspiavid Sveriges största koloni
Original languageEnglish
Pages (from-to)26-37
Number of pages12
JournalOrnis Svecica
Publication statusPublished - 2022

Bibliographical note

Funding Information:
This project has been supported financially by the World Widlife Fund, Alvins fund, Makarna Lindbergs stiftelse, Petra Lundbergs stiftelse, Postkodstiftelsen, and BirdLife Sweden. This is a report from the Centre for Animal Movement Research (CAnMove) financed by a Linnaeus grant (349-2007-8690) from the Swedish Research Council and Lund University. SÅ is supported by grants from the Swedish Research Council (621-2013-4361, 2016‐03625) and Lund University. We are grateful to Martin Amcoff and the Uppland Foundation who, together with Tierp municipality, in 2018 formed the Björn archipelago nature reserve and thus secured the foundation for being able to preserve this unique environment for the future. Thanks also to the late Roland and Carin Staav, for assistance with reviewing images from the surveillance camera in the early days. We would also like to thank Kjell Holmkvist, Kozue Shiomi, Tom Evans, Ewa Karaszewska, Martin Beal, Cristina Rueda-Uribe and many more volunteers, the hunters hired for mink hunting, and of course the Caspian Terns and the myriad of seabirds that nest at Stenarna. Many thanks to Patrik Byholm, Jonas Hentati-Sundberg, Martin Stervander, and to three reviewers for extensive and helpful comments that improved this paper.

Publisher Copyright:
© 2022 the author(s).

Subject classification (UKÄ)

  • Ecology


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