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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The breeding birds on Small biotopes in Denmark
Auteurs :	Hans Meltofte, Auteur ; Michael B. Grell, Auteur ; Peer L. Lindballe, Auteur ; Timme Nyegaard, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (103(1) 2009)
Article en page(s) :	11-21
Langues:	Anglais
Résumé :	During all atlas project in Denmark 1993-1996, the breeding birds of small biotopes (ponds, bogs, meadows, commons, heaths) were recorded within 212 squares of 4 km(2), distributed all over Denmark. Small biotopes were defined as ponds of more than 100 m(2) and bogs, meadows. commons and heaths of more than 2500 m(2). which is the lower limit for areas of this type for which the Danish nature conservation legislation grants general protection. Oil (lie other hand. the selected ares were not so large as to qualify its so called "true bird sites" (Dybbro 1985). Each site was covered by 1-2 visits during 15 April - 30 June in at least one of the study years. Only certain species should be recorded, for example were most passerines neglected see Table I For a complete list.The resulting figures must be regarded as minimum numbers. It appears from Table I that 61% of the visited sites held breeding birds associated with water, and that a limited number of species dominated Mallard Anas platyrhynchos, Moorhen Gallinula chloropus, Cool Fulica atra and Lapwing Vanellus vanellus were the commonest true waterbirds. while Thrush Nightingale Luscinia luscinia. Marsh Warbler Acrocephalus palustris, Reed Warbler Acrocephalus scirpaceus and Reed Bunting Emberiza schoeniclus were the most common water-associated passerines.In Table 2, the results are extrapolated to cover the entire Country, and it appears that c. 130000 pairs of the species in question breed on the small biotopes of Denmark. In addition to this come all the passerines etc. which are found in bushes and frees in these biotopes. In Table 2, the number of pairs recorded oil "larger sites" during the same national Survey is added: to make Lip the number living within bird sites of the entire Country. Compared to the national totals, estimated for die same period (Grell 1998) it appears that the national populations of several species may have been considerably underestimated.In Table 3 the degree of co-existence between the most common waterbird species is presented.It should be noted that the present Study is not thorough investigation of the bird fauna Oil small biotopes in Denmark. Instead, the intention is to give a rough indication of the species composition and abundance of breeding birds living in such areas, and so to give all idea of the overall importance of these biotopes its nature's 'oases" in the extensive farmland that covers two thirds of Denmark. Small biotopes have disappeared at an alarming rate during most of the 20th century, but are now protected by law so that the the declining", I rend has slowed down or perhaps even ended or reversed. However, other threats. such as eutrofication and overgrowing, continue to be a concern.

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