| Titre : | The effect of habitat, fencing and weather on the production of young of Montagu's Harrier in Denmark, 1995 to 2009 |
| Auteurs : | Mathilde Lerche-Jorgensen, Auteur ; Lars Maltha Rasmussen, Auteur ; Michael Bodker Clausen, Auteur ; Carsten Rahbek, Auteur ; Kasper Thorup, Auteur |
| Type de document : | Article |
| Dans : | Dansk Ornitologisk Forenings Tidsskrift (106(3) 2012) |
| Article en page(s) : | 79-86 |
| Langues: | Anglais |
| Résumé : | The number of breeding pairs of Montagu's Harrier Circus pygargus in Denmark has been declining since the beginning of the 1980s and the species is now mainly confined to the Wadden Sea area between the Romo Dam and the Danish/German border. The Montagu's Harrier started to switch to crop fields as its breeding habitat in the early 1990s, which was the reason that a conservation project was initiated. The primary goal was to prevent the nestlings from being accidentally killed during harvest of the fields. The project was later extended to include fencing of some nests in crop fields, to protect them from nest predators, primarily the red fox. In this survey, we analyse the effects of fencing, breeding habitat, weather and size of the fox population on the number of fledglings. Furthermore, we assay if the number of produced fledglings showed any tendency over the years.Fencing proved to be an efficient way to increase young production. The highest production of fledglings was found in cereal fields, the lowest in habitats with grass and rape (and lucerne); but weather during spring and summer appeared to be a more important factor than breeding habitat. Future climate changes may favor the breeding success of Montagu's Harrier and its ability to disperse to other parts of Denmark, although food and other factors are still likely to limit the dispersion. During 1995-2009, we noticed a declining tendency in young production from unfenced nests, but overall nest productivity showed an increasing tendency during the years when fencing of nests was conducted. |
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