Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders
As a part of an international study on wintering Hen Harriers Circus cyaneus 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 sho...
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Language: | Dutch |
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1990
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Online Access: | https://www.vliz.be/imisdocs/publications/260372.pdf |
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ftvliz:oai:oma.vliz.be:66999 2023-05-15T15:55:32+02:00 Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders Seys, J. 1990 application/pdf https://www.vliz.be/imisdocs/publications/260372.pdf nl dut https://www.vliz.be/imisdocs/publications/260372.pdf info:eu-repo/semantics/openAccess iMergus+4i+70-78 Circus cyaneus Belgium Coastal Polders info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1990 ftvliz 2022-05-01T08:46:10Z As a part of an international study on wintering Hen Harriers Circus cyaneus 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. Article in Journal/Newspaper Circus cyaneus Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Midwinter ENVELOPE(139.931,139.931,-66.690,-66.690) |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
Dutch |
topic |
Circus cyaneus Belgium Coastal Polders |
spellingShingle |
Circus cyaneus Belgium Coastal Polders Seys, J. Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders |
topic_facet |
Circus cyaneus Belgium Coastal Polders |
description |
As a part of an international study on wintering Hen Harriers Circus cyaneus 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. |
format |
Article in Journal/Newspaper |
author |
Seys, J. |
author_facet |
Seys, J. |
author_sort |
Seys, J. |
title |
Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders |
title_short |
Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders |
title_full |
Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders |
title_fullStr |
Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders |
title_full_unstemmed |
Resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief Circus cyaneus in de Vlaamse kustpolders |
title_sort |
resultaten van de midwinter-telling 1990 op slaapplaatsen van de blauwe kiekendief circus cyaneus in de vlaamse kustpolders |
publishDate |
1990 |
url |
https://www.vliz.be/imisdocs/publications/260372.pdf |
long_lat |
ENVELOPE(139.931,139.931,-66.690,-66.690) |
geographic |
Midwinter |
geographic_facet |
Midwinter |
genre |
Circus cyaneus |
genre_facet |
Circus cyaneus |
op_source |
iMergus+4i+70-78 |
op_relation |
https://www.vliz.be/imisdocs/publications/260372.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766391020458606592 |