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Massaal fouragerende dwergmeeuwen Larus minutus voor de Hollandse kust in april 1996 = Mass-feeding of little gulls off the Dutch coast in April 1996
Keijl, G.O.; Leopold, M.F. (1997). Massaal fouragerende dwergmeeuwen Larus minutus voor de Hollandse kust in april 1996 = Mass-feeding of little gulls off the Dutch coast in April 1996. Sula 11(1): 17-20
In: Sula: tijdschrift van de Nederlandse Zeevogelgroep. Nederlandse Zeevogelgroep: Scheveningen; Oudeschild, Texel; Zeist. ISSN 0926-132X, more
Peer reviewed article  

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Keyword
    Marine/Coastal

Authors  Top 
  • Keijl, G.O.
  • Leopold, M.F., more

Abstract
    On 16-18 April 1996, a large flock of feeding Little Gulls Larus minutus was observed at 8-10 km offshore the province of Noord-Holland, together with Common/Arctic Terns Sterna hirundo/paradisaea, a single Black Tern Chlidonias niger and at least 20 Great Cormorants Phalacrocorax carbo. Approximately 1000 Little Gulls were feeding on 17 April, but it could not be established what the birds were feeding on. The flock stretched over several km, along the coastal front separating riverine, coastal waters from more saline North Sea water. During seabird surveys conducted between 1985-1993, comparably large flocks were never encountered. The largest numbers during offshore surveys in these years were always seen in coastal waters. As during seawatching the largest numbers are usually counted with wind varying between north and east, it is concluded that the occurrence of large numbers of staging Little Gulls was influenced by the very calm weather during this part of their migration, enabling the gulls to feed at the coastal front, which is particularly well-developed under these circumstances.

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