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Auteur Hakon Kampe-Persson |
Documents disponibles écrits par cet auteur (5)
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Article
Leif Nilsson, Auteur ; Hakon Kampe-Persson, AuteurDans Wildfowl (70 2020)Regular goose counts made throughout Sweden since 1977/78 show that the total numbers staging and wintering in the country have increased markedly over the decades. October totals were of 51,000 geese in 1977, rising to c. 600,000 in 2018, durin[...]Article
Dmitrijs Boiko, Auteur ; Hakon Kampe-Persson, Auteur ; Julius Morkunas, AuteurDans Wildfowl (64 2014)A review of the literature on Whooper Swans Cygnus cygnus breeding in the Baltic states indicates that the swans are recolonising areas where they once bred historically. In recent years, the number of breeding birds has increased from two pairs[...]Article
Dmitrijs Boiko, Auteur ; Hakon Kampe-Persson, AuteurDans Wildfowl (60 2010)This study describes the population status, development, distribution and habitat choice of breeding Whooper Swans Cygnus cygnus breeding in Latvia. The breeding population increased from one breeding pair in 1973 to c. 260 pairs in 2009. The fi[...]Article
Dmitrijs Boiko, Auteur ; Hakon Kampe-Persson, AuteurThis study is the first to demonstrate moult migration in the Whooper Swan Cygnus cygnus. Of cygnets hatched in Latvia and known to be alive about 99% left the country to moult somewhere else in their 2nd-6th calendar year. One-sixth of these we[...]Article
Dmitrijs Boiko, Auteur ; Hakon Kampe-Persson, AuteurDans Wildfowl (61 2011)Of 396 Whooper Swan Cygnus cygnus cygnets marked with neck collars in Latvia during the 2004-2008 breeding seasons, 70% were re-sighted at least once in winters 2004/05-2009/10. Overall, 91% of the 2,985 winter re-sightings were of swans seen in[...]