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Auteur Henning Heldbjerg |
Documents disponibles écrits par cet auteur (19)
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Article
Anthony D. Fox, Auteur ; Henning Heldbjerg, Auteur ; Kevin K. Clausen, Auteur ; Ole R. Therkildsen, Auteur ; Qingshan Zhao, Auteur ; Juan J. Negro, Auteur ; Andy J. Green, AuteurDans Wildfowl (73 2023)Four adult female Greylag Geese Anser anser tagged with GPS/GSM tracking devices in East Jutland, Denmark migrated to spend the winter of 2021/22 in Coto Doñana, southern Spain. Regular 10-min GPS positions confirmed that three out of the four b[...]NouveautéArticle
Kevin K. Clausen, Auteur ; Henning Heldbjerg, Auteur ; Anthony D. Fox, AuteurDans Wildfowl (73 2023)Breeding census data and September counts show that numbers of Greylag Geese Anser anser breeding in Denmark have increased more than six-fold in the period 1990–2020. From around the year 2000, the species has also started wintering in Denmark,[...]NouveautéArticle
Henning Heldbjerg, Auteur ; Anthony D. Fox, Auteur ; Thorsten J. S. Balsby, Auteur ; Peder V. Thellesen, AuteurNight-brooding of nestlings in cavity-nesting avian species carries predation risks to parents. Anecdotally, several species are known to shift from constant adult night-brooding behaviour to leaving nestlings unattended at night during offsprin[...]Article
Henning Heldbjerg, Auteur ; Daniel Palm Eskildsen, Auteur ; Thomas Vikstrøm, Auteur ; Nina Yasmin Ali, AuteurArticle
Diana E. Bowler, Auteur ; Henning Heldbjerg, Auteur ; Anthony D. Fox, Auteur ; Maaike Jong, Auteur ; Katrin Böhning‐Gaese, AuteurEvidence of declines in insect populations has recently received considerable scientific and societal attention. However, the lack of long-term insect monitoring makes it difficult to assess whether declines are geographically widespread. By con[...]Article
Henning Heldbjerg, Auteur ; Anthony D. Fox, Auteur ; Thomas Vikstrøm, AuteurCitizen science is an indispensable means of obtaining the information necessary for maintaining bird monitoring programmes. The aim of this paper is to inspire creative thought and discussion among the ornithological community, scientists and d[...]Article
Henning Heldbjerg, Auteur ; Anthony D. Fox, Auteur ; Thomas Vikstrom, AuteurCitizen science is an indispensable means of obtaining the information necessary for maintaining bird monitoring programmes. The aim of this paper is to inspire creative thought and discussion among the ornithological community, scientists and d[...]Article
Henning Heldbjerg, Auteur ; Peter Sunde, Auteur ; Anthony David Fox, AuteurThe 2020 EU biodiversity strategy aims to halt the loss of biodiversity and ecosystem services, but this requires effective monitoring to determine whether these aims are achieved. Common bird monitoring continuously assesses changes in the avia[...]Article
Iben H. Sørensen, Auteur ; Almut E. Schlaich, Auteur ; Raymond H. G. Klaassen, Auteur ; Henning Heldbjerg, Auteur ; Ben J. Koks, AuteurOver-summering within or near the African wintering range by immature, non-breeding individuals occurs regularly in several species of long-distance migratory raptors, yet the extent of over-summering in Africa by adult birds remains unclear. In[...]Article
Philip A. Stephens, Auteur ; Lucy R. Mason, Auteur ; Rhys E. Green, Auteur ; Richard D. Gregory, Auteur ; John R. Sauer, Auteur ; Jamie Alison, Auteur ; Ainars Aunins, Auteur ; Lluis Brotons, Auteur ; Stuart H. M. Butchart, Auteur ; Tommaso Campedelli, Auteur ; Tomasz Chodkiewicz, Auteur ; Przemysław Chylarecki, Auteur ; Olivia Crowe, Auteur ; Jaanus Elts, Auteur ; Virginia Escandell, Auteur ; Ruud P. B. Foppen, Auteur ; Henning Heldbjerg, Auteur ; Sergi Herrando, Auteur ; Magne Husby, Auteur ; Frédéric Jiguet, Auteur ; Aleksi Lehikoinen, Auteur ; Åke Lindström, Auteur ; David G. Noble, Auteur ; Jean-Yves Paquet, Auteur ; Jiri Reif, Auteur ; Thomas Sattler, Auteur ; Tibor Szép, Auteur ; Norbert Teufelbauer, Auteur ; Sven Trautmann, Auteur ; Arco J. van Strien, Auteur ; Chris A. M. van Turnhout, Auteur ; Petr Vorisek, Auteur ; Stephen G. Willis, AuteurBirds populations allied in abundance Changes in climate can cause populations of species to decline, to increase, or to remain steady. Stephens et al. looked across species of common birds in Europe and the United States. Despite many differen[...]Article
Henning Heldbjerg, Auteur ; Tony Fox, AuteurCapsule Long-distance migrant birds show less favourable trends than sedentary/short-distance species. Aims To use breeding bird surveys to contrast population trends amongst common species according to their migration pattern. Methods Changes i[...]Article
Henning Heldbjerg, Auteur ; Tony Fox, AuteurCapsule Long-distance migrant birds show less favourable trends than sedentary/short-distance species. Aims To use breeding bird surveys to contrast population trends amongst common species according to their migration pattern. Methods Changes i[...]Article
Anthony D. Fox, Auteur ; Henning Heldbjerg, Auteur ; Timme Nyegaard, AuteurAvian Introduced Alien Species (IAS) constitute a threat to the integrity of native biodiversity, the economy and human health, so here we briefly review some of the problems posed by such species around the world in relation to such bird specie[...]Article
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This paper presents results of the Danish Point Count Census for wintering birds 1975/76-2003/04 and for breeding birds 1976-2004. This is the first publication from the project since TRIM replaced the chain method for computing indices and tren[...]Article
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Anne Eskildsen, Auteur ; Jorn Dyhrberg Larsen, Auteur ; Henning Heldbjerg, AuteurThis study addresses the development of a new set of indicators of bird populations using Relative Habitat Use (RHU), an objective method for indicator species selection. RHU facilitates the calculation of indicators for all nine basic habitat t[...]Article
Anthony D. Fox, Auteur ; Jorgen P. Kjeldsen, Auteur ; Mark Desholm, Auteur ; Palle A. F. Rasmussen, Auteur ; Thorsten J. S. Balsby, Auteur ; Henning Heldbjerg, AuteurDans Wildfowl (64 2014)Analysis of data relating to calling Spotted Crakes Porzana porzana, input to the Danish Citizen Science portal DOFbasen, suggested that on controlling for observer effort, national numbers reported annually have remained reasonably stable durin[...]