{"refrec":{"BRefID":66999,"RR":"<b>Seys, J.</b> (1990). Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief <i>Circus cyaneus</i> in de Vlaamse kustpolders. <i>Mergus 4</i>: 70-78","BEntID":63367,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Mergus 4</i>: 70-78","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Seys, J.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Seys, J.","Englishabstract":"As a part of an international study on wintering Hen Harriers <i>Circus cyaneus</i>  in Europe, roosting sites in the coastal Polders of Flanders have been counted on 13 and 14 January 1990. The position of the roosts is given in Fig. I. The numeric distribution on mid-January counts in 1989 and 1990 is shown in Fig. 2. The total number of birds counted was 48-53 (see Table I). We assume however that there are still some (small) unknown roosts (especially in the western part of the Polders). So the real winter population was probably slightly higher (55-65 birds). A similar survey in January 1989 revealed a considerably lower number (40-45 birds) but this was partially due to an incomplete coverage. Some roosts in the western part of the Polders, especially in or near the flood plains of the river Yzer, held a considerable higher proportion of grey males than in the east. This difference in sex-ratio can probably be described to variation in habitat and food supply.","AbstractOtherLang":"In het kader van het internationaalonderzoek naar het voorkomen van Blauwe Kiekendieven <i>Circus cyaneus</i> in de Europese overwinteringskwartieren, werd op 13-14 januari 1990 een volledige telling van alle gekende slaapplaatsen van de Vlaamse kustpolders verricht. In totaal werden 46-53 ex. geteld, en vermoed wordt dat het werkelijke aanwezige aantal tussen 55-65 ex. lag. Dit aantal ligt een stuk hoger dan het aantal van 40-45 dat voor half januari 1969 werd geschat. Een belangrijk deel van de verklaring voor deze hogere aantallen in 1990 moet echter worden gezocht in het nog onvoldoende gekend zijn van de aanwezige slaapplaatsen aan de Westkust.Van het totaal aantal kiekendieven in 1990, werd een belangrijk deel (27-31 ex.) gesignaleerd aan de Westkust, die door de aanwezigheid van rijke, uitgestrekte jachtgebieden en geschikte slaapplaatsen moet beschouwd worden als één van de beste overwinteringsgebieden voor de Blauwe Kiekendief in Vlaanderen. In dit gebied valt het overigens op dat het % mannetjes hoger is dan aan de Oostkust, en dit vnl. door het grote aantal mannetjes op een nieuw ontdekte slaapplaats in het Westbroek. Verschillen in landschapsstructuur (en voedselaanbod), liggen hiervan vermoedelijk aan de basis.","BibLvlCode":"AS","StandardTitle":"Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief <i>Circus cyaneus</i> in de Vlaamse kustpolders","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2026-06-11 01:30:29.966382","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1990,"MonPub":null,"DateUpdate":"2020-03-19","DateCreate":"2004-10-11","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":66999,"PubliDate":1990,"Pagination":"70-78","XtraPublOfAnaID":null,"ISBN":null,"Volume":"4","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45609,"SerRR":"Mergus: Ornithologisch tijdschrift van de Vlaamse kust. 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