Journal of Ornithology

, 151:19 | Cite as

Local and large-scale climatic variables as predictors of the breeding numbers of endangered Lesser Black-backed Gulls on the Norwegian Coast

  • Jan Ove Bustnes
  • Tycho Anker-Nilssen
  • Svein-Håkon Lorentsen
Original Article

Abstract

In the 1970s and 1980s, the nominate subspecies of the Lesser Black-backed Gull (Larus fuscus fuscus) showed a dramatic drop in breeding numbers on the Norwegian Coast, and in 2000, the population in some colonies was only 10–20% of the population in 1980. This decline has been attributed to the collapse in the stock of Norwegian spring spawning herring (Clupea harengus). In this study, we examined whether local climate (sea and air temperatures), winter NAO (North Atlantic Oscilliation), and the year-class strength and size of 0-group herring could predict the relative changes in breeding numbers between years, mainly after the population collapse. Breeding birds were counted in 19 of the years between 1980 and 2007 in an archipelago on the coast of Helgeland, northern Norway. The best model predicting changes in breeding numbers for the period between 1980 and 2005 (for which data on 0-group herring was available) included mean local air temperature in winter (January–March) and winter NAO, explaining 57% of the variation between years, while the other factors had little effect. When also adding the years 2006–2007 (no herring data), the best model included only mean air temperature in winter, explaining 41% of the variation. In conclusion, the high positive correlation between breeding numbers and climatic factors probably resulted from a higher availability of important fish prey after mild winters, for which 0-group herring presently may only account for a limited proportion. However, this prey might have been of much more importance prior to the population decline.

Keywords

NAO Temperature Climate change Seabird Population trend 

Notes

Acknowledgments

The Norwegian Monitoring Programme for Seabirds is financed through the Directorate for Nature Management. This study was also financed through the Norwegian Seabird Program (SEAPOP). We thank members of the local ornithological society, especially Espen Dahl and Gaute Dahl, for performing much of the monitoring, and the Institute of Marine Research in Bergen for permission to use the data series on herring abundance reported by ICES. In addition, we thank Jorg Welcker, Trond Johnsen and Morten Helberg for help during fieldwork and Rob Barrett for correcting the English.

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Copyright information

© Dt. Ornithologen-Gesellschaft e.V. 2009

Authors and Affiliations

  • Jan Ove Bustnes
    • 1
  • Tycho Anker-Nilssen
    • 2
  • Svein-Håkon Lorentsen
    • 2
  1. 1.The Polar Environmental CentreNorwegian Institute for Nature ResearchTromsøNorway
  2. 2.Norwegian Institute for Nature ResearchTrondheimNorway

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