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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Rare and colonial breeding birds in The Netherlands in 2010-2011
Auteurs :	Arjan Boele, Auteur ; Fred Hustings, Auteur ; Joost van Bruggen, Auteur ; Arend van Dijk, Auteur ; Jan-Willem Vergeer, Auteur ; Calijn Plate, Auteur
Type de document :	Article
Dans :	Limosa (87(1) 2014)
Article en page(s) :	1-19
Résumé :	This paper reports on populations of rare and colonial breeding birds in The Netherlands in 2010 and 2011. The data were derived from a national monitoring scheme for 17 colonial species and c. 100 scarce or rare breeding birds, carried out in The Netherlands since at least 1992. Fieldwork is conducted using standardized methods, among which a new software application for aggregating the daily records submitted by observers into territories (Autocluster). For some species the data represent complete national censuses, for others only key sites (including all Natura 2000 sites) are covered (see Tab. 1). The counts are part of a governmental ecological monitoring network and are coordinated by Sovon Dutch Center for Field Ornithology, in close collaboration with Statistics Netherlands (CBS; trend analyses) and species' experts and working groups. Fieldwork is mainly conducted by dedicated volunteers and staff of nature conservation agencies. Counts in the Wadden Sea are part of the Trilateral Monitoring and Assessment Program (TMAP).Table 1 summarises numbers and trends. The breeding seasons of 2010 and 2011 were preceded by winters with cold spells and extensive snow cover, particularly 2009/10. These and the previous rather cold winter of 2008/09 had a clear negative impact on numbers and distribution of some species, notably Little Egret (-77% from 2008 to 2010, but slight recovery in 2011), Grey Heron (-20%), Common Kingfisher (-50%), Zitting Cisticola (-50%) and Grey Wagtail (-50%). Contrary to expectation, populations of Eurasian Bittern, Barn Owl, Little Owl and Cetti's Warbler did not decline after these winters.Compared to previous reports, the expansion of thriving (or recovering) species like Little Bittern, Purple Heron, White Stork, Eurasian Spoonbill, White-tailed Eagle, Montagu's Harrier, Peregrine Falcon, Common Crane, Eurasian Eagle Owl, European Nightjar, Middle Spotted Woodpecker, Redbacked Shrike and Eurasian Treecreeper (subsp.macrodactyla) continued in 2010-11. Great White Egret, rapidly increasing in numbers in the non-breeding period, still shows little expansion as a breeding bird. Also the settlement of Boreal Owl in 2008-09 did not last; despite extensive nocturnal searches only solitary males were recorded. Further highlights in 2010-11 included breeding Whooper Swan (1 pair), Ferruginous Duck (3 in 2010), Smew (1-4, possibly escaped birds but no signs of captivity), Atlantic Great Cormorant P. c. carbo (5-6), Black Kite (1-2), Baillon's Crake (7-9), Black-legged Kittiwake (new settlement on a platform in the Dutch North Sea, where coverage incomplete), Little Gull (1), Eurasian Hoopoe (1 territory) and Citrine Wagtail (successful, male paired with Blue-headed Wagtail). Melodious Warbler still remains a rare breeder, confined to the southern fringes of the country. For the first time since years, a fairly complete census of Bearded Reedling resulted in a national population estimate of 15001700 pairs in 2010 (in 2011 declining to 800-1000). Compared to these increasing or accidental breeders, there is a wide range of species that have suffered declines in the past decade(s), and did not show any sign of recovery in 2010-11. Examples are Black Grouse (4 males in 2011), Hen Harrier (20-25 pairs), Pied Avocet, Kentish Plover, Black-headed Gull, Short-eared Owl and Eurasian Wryneck. Ruff, Crested Lark and Corn Bunting are on the verge of disappearance from The Netherlands. Northern Wheatear stabilised at a low level after a long-term decline. Among non-native species, the increase of Ruddy Duck has stopped and African Sacred Ibis disappeared as a breeding bird as free living individuals were caught. Only few confirmed breeding House Crow were reported (population 29 individuals in January 2011).

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