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Long-term populatio...
Long-term population trends and shifts in distribution of Bewick's swans cygnus columbianus bewickii wintering in northwest Europe
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- Beekman, Jan (författare)
- Stichting het Groninger Landschap
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- Koffijberg, Kees (författare)
- Dutch Centre for Field Ornithology
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- Wahl, Johannes (författare)
- Federation of German Avifaunists (DDA)
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visa fler...
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- Kowallik, Christine (författare)
- Biologische Station Westliches Ruhrgebiet
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- Hall, Colette (författare)
- Wildfowl & Wetlands Trust
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- Devos, Koen (författare)
- Research Institute for Nature and Forest
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- Clausen, Preben (författare)
- Aarhus University
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- Hornman, Menno (författare)
- Dutch Centre for Field Ornithology
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- Laubek, Bjarke (författare)
- No affiliation available (private)
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- Luigujõe, Leho (författare)
- Estonian University of Life Sciences - EMÜ
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- Wieloch, Maria (författare)
- Institute - Center for Molecular and Macromolecular Studies of the Polish Academy of Sciences
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- Boland, Helen (författare)
- BirdWatch Ireland
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- Švažas, Saulius (författare)
- Lithuanian Nature Research Centre
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- Nilsson, Leif (författare)
- Lund University,Lunds universitet,Biodiversitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Biodiversity,Department of Biology,Faculty of Science
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- Stipniece, Antra (författare)
- University of Latvia
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- Keller, Verena (författare)
- The Swiss Ornithological Institute
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Gaudard, Clémence (författare)
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Degen, Axel (författare)
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Shimmings, Paul (författare)
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Larsen, Bjørn Harald (författare)
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- Portolou, Danae (författare)
- Hellenic Ornithological Society, Athens
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- Langendoen, Tom (författare)
- Wetlands International
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- Wood, Kevin A. (författare)
- Wildfowl & Wetlands Trust
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- Rees, Eileen C. (författare)
- Wildfowl & Wetlands Trust
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(creator_code:org_t)
- 2020
- 2020
- Engelska 30 s.
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Ingår i: Wildfowl. - 0954-6324. ; :69, s. 73-102
- Relaterad länk:
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https://lup.lub.lu.s...
Abstract
Ämnesord
Stäng
- Coordinated international censuses of the Northwest European Bewick's Swan Cygnus columbianus bewickii population have been undertaken across the swans' wintering range at c. 5-year intervals since 1984. During the early years of the study, numbers increased steadily to a peak of 29,780 individuals in January 1995, but then declined by 39.4% to 18,057 swans counted in January 2010 before showing a partial recovery to 20,149 recorded in January 2015. Changes in distribution across the wintering range were also recorded; a higher proportion of the population now remains in more easterly countries (notably Germany) in mid-winter, whilst only a handful of birds migrated to Ireland (at the western edge of the range) during the 2000s compared to >1,000 wintering there at the start of the study. Variation between censuses in the proportion of swans recorded in different parts of the range were attributable to weather conditions, with more swans wintering further north in warmer years. The overall percentage of cygnets recorded in each of the census years ranged from 9.6% in 2010 to 13.2% in 2005, with no obvious consistency over time in the distribution of cygnets across the wintering range. There were however changes between 1990 and 2015 in the swans' use of feeding habitats, with a decline in the proportion of birds on pasture and a corresponding increase in those on arable land. Decreases in the total population size and changes in distribution in the 21st century have implications for the designation and resultant protection of sites of international importance for the species.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- Habitat use
- Population increase and decline
- Short-stopping
- Species threshold levels
- Weather conditions
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
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Wildfowl
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Till lärosätets databas
- Av författaren/redakt...
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Beekman, Jan
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Koffijberg, Kees
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Wahl, Johannes
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Kowallik, Christ ...
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Hall, Colette
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Devos, Koen
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visa fler...
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Clausen, Preben
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Hornman, Menno
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Laubek, Bjarke
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Luigujõe, Leho
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Wieloch, Maria
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Boland, Helen
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Švažas, Saulius
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Nilsson, Leif
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Stipniece, Antra
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Keller, Verena
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Gaudard, Clémenc ...
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Degen, Axel
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Shimmings, Paul
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Larsen, Bjørn Ha ...
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Portolou, Danae
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Langendoen, Tom
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Wood, Kevin A.
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Rees, Eileen C.
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visa färre...
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