Migratory pathways and winter destinations of Northern Gannets breeding at Helgoland (North Sea): known patterns and increasing importance of the Baltic Sea DOI Creative Commons
Stefan Garthe, Verena Peschko, David A. Fifield

et al.

Journal of Ornithology, Journal Year: 2024, Volume and Issue: 165(4), P. 869 - 880

Published: June 25, 2024

Abstract We analysed the migratory behaviour of adult Northern Gannets ( Morus bassanus ) breeding at Helgoland in North Sea, based on data obtained from geolocation devices non-breeding season 2016–2017. Birds moved east and south-west to a broad range wintering sites, ranging western Baltic Sea North-West Africa. Three out 12 birds spent winter Africa, while 9 wintered Europe, with primary sites Sea. All but one tagged bird some time or transitional waters between also online databases (dofbasen.dk, ornitho.de) German Seabirds database explore extent which used as well Kattegat Skagerrak, during months. Records Danish have increased substantially over last 18 winters, particular increases There was notable increase sightings waters, this occurred later than more northerly waters. Both analyses demonstrated that explored part increasingly intensively. This recent is accord establishment exponential nearest colony Helgoland.

Language: Английский

Are increasing roosting waterbird numbers responsible for eutrophication of shallow lakes? Examples from a Danish Ramsar site DOI Creative Commons
Preben Clausen, Torben L. Lauridsen, Claus Lunde Pedersen

et al.

Hydrobiologia, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 22, 2024

Abstract The Water Framework Directive (WFD) requires actions from European Union Member States to reduce external nutrient loading in lakes of moderate/poor/bad ecological status and restore their good status. Several poor-quality Danish have been exempted WFD criteria (and more proposed), due suspected major imported contributions waterbirds, without supporting evidence. Here, we estimated relative increasing numbers roosting waterbirds compared total loadings four brackish (43–491 ha) at an internationally important Ramsar site/EU Birds Special Protection Area. Combining night- daytime counts the most numerous species with intake faecal output models, birds (mostly geese) contributed 0.2–0.4% all N inputs (0.3–1.2 kg N/ha/year) 0.6–2.0% P (0.04–0.12 P/ha/year) three (one which has proposed criteria), but potentially as high 14% 76%, respectively, a fourth clearwater lake direct inflow or outlets. These results confirm need for case-by-case assessments avian import balance before exempting conditions supposed natural waterbirds.

Language: Английский

Citations

2
Migratory pathways and winter destinations of Northern Gannets breeding at Helgoland (North Sea): known patterns and increasing importance of the Baltic Sea DOI Creative Commons
Stefan Garthe, Verena Peschko, David A. Fifield

et al.

Journal of Ornithology, Journal Year: 2024, Volume and Issue: 165(4), P. 869 - 880

Published: June 25, 2024

Abstract We analysed the migratory behaviour of adult Northern Gannets ( Morus bassanus ) breeding at Helgoland in North Sea, based on data obtained from geolocation devices non-breeding season 2016–2017. Birds moved east and south-west to a broad range wintering sites, ranging western Baltic Sea North-West Africa. Three out 12 birds spent winter Africa, while 9 wintered Europe, with primary sites Sea. All but one tagged bird some time or transitional waters between also online databases (dofbasen.dk, ornitho.de) German Seabirds database explore extent which used as well Kattegat Skagerrak, during months. Records Danish have increased substantially over last 18 winters, particular increases There was notable increase sightings waters, this occurred later than more northerly waters. Both analyses demonstrated that explored part increasingly intensively. This recent is accord establishment exponential nearest colony Helgoland.

Language: Английский

Citations

1