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Documents disponibles écrits par cet auteur (8)
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Article
Anthony D. Fox, Auteur ; Johnny Kahlert, AuteurDans Wildfowl (65 2015)To seek support for the hypothesis that diurnal rhythms in protein and sugar levels in food plants were responsible for the largely nocturnal foraging of moulting flightless Grey lag Geese Anser anser (which ceased feeding to rest during the mid[...]
Article
Johnny Kahlert, AuteurThe escape behaviour of flightless greylag geese Anser anser has been studied at a Danish moult site. In more than 40% of escapes, a stimulus could not be discerned, suggesting some importance of inaccurate risk assessment among the geese. Quasi[...]
Article
Johnny Kahlert, Auteur ; Aivar Leito, Auteur ; Bjarke Laubek, Auteur ; Leho Luigujoe, Auteur ; Andres Kuresoo, Auteur ; Kim Aaen, Auteur ; Aarne Lund, AuteurWe studied the effects of weather conditions, temporal factors and distance to coast on the flight altitude of migrating waterbirds in Western Estonia. We used a laser range finder and marine surveillance radar to measure flight altitudes, and i[...]
Article
A. D. Fox, Auteur ; Mark Desholm, Auteur ; Johnny Kahlert, Auteur ; Thomas Kjaer Christensen, Auteur ; Ib Krag Petersen, AuteurDans Ibis (148 MAR 2006)European legislation requires Strategic Environmental Assessments (SEAs) of national offshore wind farm (OWF) programmes and Environmental Impact Assessments (EIAs) for individual projects likely to affect birds. SEAs require extensive mapping o[...]
Article
Anthony D. Fox, Auteur ; Keith A. Hobson, Auteur ; Johnny Kahlert, AuteurFeather stable isotope composition may not reflect local isoscapes in which they were grown if supplemented with protein of endogenous origin. Thus, feather isotope analysis, combined with knowledge of local isoscapes can be used to infer endoge[...]
Article
Anthony D. Fox, Auteur ; Johnny Kahlert, Auteur ; Alyn J. Walsh, Auteur ; David A. Stroud, Auteur ; Carl Mitchell, Auteur ; Jens N. Kristiansen, Auteur ; Ebbe Bogebjerg Hansen, AuteurWe used measurement of wing feather length as an index of moult stage to assess body mass changes amongst samples of geese caught from three different wild populations during the period of regrowth of flight feathers. Amongst male and female Gre[...]
Article
Johnny Kahlert, Auteur ; Preben Clausen, Auteur ; Jens Peder Hounisen, Auteur ; Ib Krag Petersen, AuteurThe initiation of agri-environmental schemes (AES) to improve habitats for breeding waders may not show expected benefits in all situations. We show this, using results from a study of breeding waders on 469 grassland fields in the Danish Wadden[...]
Article
Johnny Kahlert, Auteur ; Malcolm Coupe, Auteur ; Fred Cooke, AuteurDuring the late winter and spring of 1997, sex-ratios and pairing chronology of Red-breasted Mergansers were studied in the Fraser River Estuary, south west Canada. Until late March at one site, English Bay, there was a strong male-bias, whereas[...]
