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Auteur J. N. Kristiansen |
Documents disponibles écrits par cet auteur (8)
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Article
T. Nyegaard, Auteur ; J. N. Kristiansen, Auteur ; A. D. Fox, AuteurDans Wildfowl (52 2001)The activity budgets of Greenland White-fronted Geese Anser albifrons flavirostris during spring staging were studied in different Icelandic hayfields dominated by three grass species: Poa pratensis, Deschampsia caespitosa and Phleum pratense. G[...]![]()
Article
H. Boyd, Auteur ; A. D. Fox, Auteur ; J. N. Kristiansen, Auteur ; D. A. Stroud, Auteur ; A. J. Walsh, Auteur ; S. M. Warren, AuteurAbdominal profiles of spring-staging White-fronted Geese in Iceland were recorded in 1990, 1991, 1997 and 1998, chiefly at Hvanneyri, the largest known staging area. Median profile scores were markedly lower on arrival in Iceland than at departu[...]![]()
Article
J. N. Kristiansen, Auteur ; T. Fox, Auteur ; G. Nachman, AuteurDans Ardea (88(2) 2000)The selectivity of Greenland White-fronted Geese Anser albifrons flavirostris feeding on Timothy Phleum pratense hayfields in Iceland during their spring staging was studied in three fields of different shoot density (high, medium and low) and d[...]![]()
Article
J. N. Kristiansen, AuteurDans Ardea (86(2) 1998)Egg predation in Greylag Geese Anser anser nesting in reedbeds was studied at three sites in Vejleme (NW Denmark). Overall, 34% of all clutches hatched successfully (range 26-53%), while at least 34% of all nests were abandoned. Avian predation [...]![]()
Article
J. N. Kristiansen, Auteur ; N. S. Jarrett, AuteurIn recent years, breeding Canada Geese Branta canadensis interior have established themselves in areas of West Greenland previously exploited by Greenland White-fronted Geese Anser albifrons flavirostris only. In this study, diet, behaviour and [...]![]()
Article
A. D. Fox, Auteur ; J. O. Hilmarsson, Auteur ; O. Einarsson, Auteur ; H. Boyd, Auteur ; J. N. Kristiansen, Auteur ; D. A. Stroud, Auteur ; A. J. Walsh, Auteur ; S. M. Warren, Auteur ; C. Mitchell, Auteur ; I. S. Francis, Auteur ; T. Nygaard, AuteurDans Wildfowl (50 1999)A combination of ringing recoveries, resightings of individually marked birds and regularly counted census routes suggest that Greenland White-fronted Geese stage in Iceland from c.10 April until c.12 May in spring and c.30 August until c.31 Oct[...]![]()
Article
J. N. Kristiansen, Auteur ; B. M. Petersen, AuteurDans Ardea (88(2) 2000)We studied Greylag Goose Anser anser nest distribution in relation to reed stem density in the Tommerby Fjord reedbed, Denmark, using aerial photography to locate nests. Digitised photographs were used to establish a relationship between spectra[...]![]()
Article
J. N. Kristiansen, Auteur ; A. J. Walsh, Auteur ; A. D. Fox, Auteur ; H. Boyd, Auteur ; D. A. Stroud, AuteurDans Wildfowl (50 1999)Based on data from seven successive years from the wintering grounds in Ireland and one year from the breeding grounds in West Greenland, the variation in the black striation on the abdomen and breast, the so-called belly barring, of the Greenla[...]



