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Documents disponibles écrits par cet auteur (12)
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Article
Hans Meltofte, Auteur ; Lars Dinesen, Auteur ; David Boertmann, Auteur ; Poul Hald-Mortensen, AuteurIf we look at the breeding birds in the Danish landscape types, it must be assumed that bird species associated with trees and shrubs in woods, gardens and scattered vegetation are very likely to have become many times more numerous over the las[...]
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Flemming Merkel, Auteur ; David Boertmann, Auteur ; Knud Falk, Auteur ; Morten Frederiksen, Auteur ; Kasper Johansen, Auteur ; Aili Lage Labansen, Auteur ; Jannie Fries Linnebjerg, Auteur ; Anders Mosbech, Auteur ; Christian Sonne, AuteurRitenbenk/Innaq in Disko Bay is the only remaining Thick-billed Murre colony in central West Greenland. It has declined by 72% since 1980 and now (2012) holds c.1,100 breeding pairs. In 2005-2006 and 2011-2012, a number of studies were carried o[...]
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David Boertmann, Auteur ; Morten Frederiksen, AuteurGreat Black-backed (Larus marinus), Lesser Black-backed (L. fuscus) and Herring (L. argentatus) gulls have all shown population increases and range expansion in Greenland in recent decades, but in very different ways. Great Black-backed Gulls in[...]
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Craig R. White, Auteur ; David Boertmann, Auteur ; David Grémillet, Auteur ; Patrick J. Butler, Auteur ; Jonathan A. Green, Auteur ; Graham R. Martin, AuteurArctic seas have warmed and sea ice has retreated. This has resulted in range contraction and population declines in some species, but it could potentially be a boon for others. Great Cormorants Phalacrocorax carbo have a partially wettable plum[...]
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David Boertmann, Auteur ; Uffe Gjol Sorensen, AuteurA 7.18 km(2) area of urban Copenhagen wits surveyed for breeding Magpies Pica pica in 1965 and 1995, and part of the same area ill 2004 (Figs I 2, 3). Moreover, historical sources (Floystrup 1920) made it possible to describe the Magpie populati[...]
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David Boertmann, Auteur ; Kent Olsen, Auteur ; Rasmus Due Nielsen, AuteurAerial surveys of geese were carried out in July/August 2008 and 2009 in Northeast and North Greenland. Moulting Pink-footed Geese Anser brachyrhynchus had increased considerably in numbers compared to results of similar surveys in 1988 up to th[...]
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Article
David Boertmann, Auteur ; Anders Mosbech, Auteur ; Flemming Ravn Merkel, AuteurThe coastal and offshore waters of Southwest Greenland are internationally important winter quarters for seabirds. Estimates of the total number of wintering seabirds are in the region of 3.5-5.5 million individuals (not including an unknown but[...]
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Anthony D. Fox, Auteur ; David Sinnett, Auteur ; John Baroch, Auteur ; David A. Stroud, Auteur ; Kaj Kampp, Auteur ; Carsten Egevang, Auteur ; David Boertmann, AuteurThree subspecies of the Canada Goose (Branta canadensis interior, B.c. parvipes and B.c. hutchinsii) have been reported from Greenland, where the species has increased dramatically as a breeding and summering bird in the last 30 years. We report[...]
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David Boertmann, Auteur ; Stinne Aastrup, AuteurA pair of Tengmalm's Owl Aegolius funereus bred in a conifer plantation in Jutland in 2007. The nest was placed in an old nest hole of Black Woodpecker Dryocopus martius, 10 m up in a big fir (planted in 1897). The first egg was estimated to hav[...]
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David Boertmann, Auteur ; Anders Mosbech, AuteurDuring the years 1992-1998 the National Environmental Research Institute, department of Arctic Environment (previously Greenland Environmental Research Institute), carried out several ship-based and aircraft-based seabird surveys. These surveys [...]
