{"refrec":{"BRefID":67002,"RR":"<b>Seys, J.</b> (1992). Resultaten van slaapplaatstellingen van blauwe kiekendieven <i>Circus cyaneus</i> in de kustpolders en het krekengebied van NO-Vlaanderen in de winters 1990-1991 en 1991-1992. <i>Mergus 6</i>: 229-241","BEntID":63371,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Mergus 6</i>: 229-241","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Seys, J.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Seys, J.","Englishabstract":"In January 1989 and 1990 simultaneous Hen Harrier <i>Circus cyaneus</i> roost counts were carried out in the Flemish coastal polders. In the following winters (1990-'91 and 1991-'92), similar counts were organized on five different dates as part of the \"Hen Harrier winter Roost Survey\" of the BTO IR. Clarke). The polder area of N.E.-Flanders was counted too. This paper provides a brief outline of these censuses. 16 roosts were visited in 1990-'91 and 12 ones in 1991-'92. Among them 10 and 7 ones were at least once occupied. The most important roost is and remains the Blankaart in Woumen. The next important ones are the Zwin in Knokke and the Oostpolder-kreek in Sint-Jan-in-Eremo. The numbers of the Hiddle Coast are traditionally low: only a few scattered specimen staying over in the Rattevalle or the Kleine Keignaert. The total numbers of January 1991 were 53-57. In January 199233-38 specimen were counted. In comparison to the fairly high numbers of the previous winter, 1991-'92 has low ones. The size of wintering Hen Harriers in het Flemish coastal polders can be estimated at 35-100 specimen. To this, one must add the 5-10 ones in the marshland of N.E.-Flanders. These relative high numbers in comparison to results of neighbouring countries, stress the great importance of our polders for Hen Harrier. Further investigation is necessary in order to find a solution for unresolved questions concerning winter distribution of this species and therefore colour-marking study can play a major role.","AbstractOtherLang":"In januari 1989 en 1990 werd in de Vlaamse kustpolders een simultaantelling van alle Blauwe Kiekendievenslaapplaatsen gehouden. In de daaropvolgende winters 1990-'91 en 1991-'92 werden binnen het kader van de 'Hen Harrier winter Roost Survey' van de B.T.O. (R.Clarke), op vijf data gelijkaardige tellingen georganiseerd. Ook het Krekengebied van NO-Vlaanderen werd geteld. Dit artikel geeft een beknopt verslag van deze tellingen. Respectievelijk 16 en 12 slaapplaatsen werden bezocht in 1990-'91 en 1991-'92, waarvan er 10 en 7 minstens éénmaal bezet waren. Belangrijkste slaapplaats is en blijft de Blankaart (Woumen), gevolgd door het Zwin (Knokke) en de Oost-polderkreek (Sint-Jan-in-Eremo). De Middenkust scoort traditiegetrouw laag met slechts sporadisch solitaire exemplaren over nachtend in de Rattevalle of de Kleine Keignaert. Het totaal aantal exemplaren in januari 1991 bedroeg 53-57 ex., in januari 1992 werden 33-38 exemplaren geteld. Uit een vergelijking met vorige winter volgt dat 1991- '92 mag worden beschouwd als ee winter met lage aantallen Blauwe Kiekendieven, daar waar 1990-'91 eerder vrij hoog scoort. De grootte van het winterbestand van deze soort mogen we voor de Vlaamse kustpolders op 35-100 schatten. Daarbovenop komen nog eens 5-10 ex. in het Krekengebied van NO-Vlaanderen. Deze relatief hoge aantallen, in vergelijking met resultaten uit naburige landen, benadrukken het belang van onze polders voor de Blauwe Kiekendief. Verder onderzoek op deze soort is aangewezen, teneinde onopgeloste vragen inzake winterverspreiding te kunnen oplossen. Kleurmerkonderzoek kan hier een belangrijke rol in spelen.","BibLvlCode":"AS","StandardTitle":"Resultaten van slaapplaatstellingen van blauwe kiekendieven <i>Circus cyaneus</i> in de kustpolders en het krekengebied van NO-Vlaanderen in de winters 1990-1991 en 1991-1992","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2026-04-17 01:30:29.716547","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1992,"MonPub":null,"DateUpdate":"2017-07-12","DateCreate":"2004-10-11","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":67002,"PubliDate":1992,"Pagination":"229-241","XtraPublOfAnaID":null,"ISBN":null,"Volume":"6","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45609,"SerRR":"Mergus: Ornithologisch tijdschrift van de Vlaamse kust. 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