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Resultaten van slaapplaatstellingen van blauwe kiekendieven Circus cyaneus in de kustpolders en het krekengebied van NO-Vlaanderen in de winters 1990-1991 en 1991-1992

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Resultaten van slaapplaatstellingen van blauwe kiekendieven Circus cyaneus in de kustpolders en het krekengebied van NO-Vlaanderen in de winters 1990-1991 en 1991-1992. / Seys, J.

In: Mergus, Vol. 6, 1992, p. 229-241.

Research output: Contribution to journalA3: Article in a journal without peer review

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@article{26697c697701449e859ad4f664f3635b,
title = "Resultaten van slaapplaatstellingen van blauwe kiekendieven Circus cyaneus in de kustpolders en het krekengebied van NO-Vlaanderen in de winters 1990-1991 en 1991-1992",
abstract = "In January 1989 and 1990 simultaneous Hen Harrier Circus cyaneus 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.",
author = "J Seys",
note = "Publication Authorstring : Seys, J. Publication RefStringPartII : <i>Mergus 6</i>: 229-241",
year = "1992",
language = "Nederlands",
volume = "6",
pages = "229--241",
journal = "Mergus",
publisher = "Vogelwerkgroep Noord-West-Vlaanderen",

}

RIS

TY - JOUR

T1 - Resultaten van slaapplaatstellingen van blauwe kiekendieven Circus cyaneus in de kustpolders en het krekengebied van NO-Vlaanderen in de winters 1990-1991 en 1991-1992

AU - Seys, J

N1 - Publication Authorstring : Seys, J. Publication RefStringPartII : <i>Mergus 6</i>: 229-241

PY - 1992

Y1 - 1992

N2 - In January 1989 and 1990 simultaneous Hen Harrier Circus cyaneus 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.

AB - In January 1989 and 1990 simultaneous Hen Harrier Circus cyaneus 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.

M3 - A3: Artikel in een tijdschrift zonder peer review

VL - 6

SP - 229

EP - 241

JO - Mergus

JF - Mergus

ER -

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