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Verspreiding van zeevogels op het Belgisch Continentaal Plat [Distribution of seabirds on the Belgian Continental Shelf]
Citatie
Contact:
Courtens, Wouter Beschikbaarheid: Beschikbaar onder voorwaarden
The data are withheld from general circulation and disclosure but access may be obtained on a case-by-case basis through negotiation Nota: Release with permission of the appropriate parties
Beschrijving
INBO conducts standardised ship-based surveys since September 1992.Until 2001 this was done from public ferries and the RV Belgica.Since 2001,three fixed monitoring-routes were counted each month from the RV 'Zeeleeuw' (e.g. Seys, 2001). meer
To determine the distribution, numbers and densities of seabirds in the BPNS, the data collected between September 1992 and December 2004 were analysed. Additionally, the data from the counts in 2005 were used to determine the species-diversity (see further). Thus, the compiled dataset does comprise data of standardised counts that are well distributed both temporally (both between years and within years) and spatially on the BPNS. Both swimming and flying birds were counted by a standardised strip-transect-method (Tasker et al., 1984). All swimming birds that are within a distance of 300 m and in an angle of 90° forward from the study-vessel were counted in intervals of 10 minutes. Flying birds were counted using a snapshot method (Komdeur et al., 1992). All flying birds within a distance of 300 m and an angle of 90° forward from the study-vessel were counted every minute. In order to compensate for missed small and dark birds, the mean density of swimming birds has been multiplied with an internationally accepted correction factor (Stone et al., 1995). The results of these counts were transformed into densities by taking into account the speed of the research-vessel. All counts were reduced to the spatial mid points of the concerned 10-minute tracks. These midpoints were called position keys or ‘poskeys’ and are displayed in the dataset in degrees northern latitude and eastern longitude and hold the local densities of all species (number per square km). If the ship changed its course within a 10-minute count, the counts relate to a shorter period. To avoid that counts in very short periods of time would bias the calculation of bird densities, all poskeys in which less than 1 km was covered were omitted. Since ferry counts may result in an underestimation of the densities of certain species (e.g. alcidae and divers) because of the higher speed and the height of the observation platform, the data collected from ferries were not retained in the processed dataset. After these selections, data of 10.808 poskeys were retained. For the calculation of the number of species per 3x3 km-square all counts (also counts from ferries and those of 2005) were used (15.908 poskeys) Scope Thema's: Biologie, Biologie > Vogels Kernwoorden: Marien/Kust, Vogels, Zeevogels, ANE, België, Belgisch Continentaal Plat (BCP), Alca torda Linnaeus, 1758, Aves, Fulmarus glacialis (Linnaeus, 1761), Gavia Forster, 1788, Larus argentatus Pontoppidan, 1763, Larus canus Linnaeus, 1758, Larus fuscus Linnaeus, 1758, Larus marinus Linnaeus, 1758, Larus minutus Pallas, 1776, Melanitta nigra (Linnaeus, 1758), Morus bassanus (Linnaeus, 1758), Podiceps cristatus (Linnaeus, 1758), Rissa tridactyla (Linnaeus, 1758), Stercorarius skua (Brünnich, 1764), Sterna hirundo Linnaeus, 1758, Sterna sandvicensis Latham, 1787, Uria aalge (Pontoppidan, 1763) Geografische spreiding ANE, België, Belgisch Continentaal Plat (BCP) [Marine Regions] Spreiding in de tijd
Januari 1992 - December 2004 Taxonomic coverage
Alca torda Linnaeus, 1758 [WoRMS]
Aves [WoRMS]
Fulmarus glacialis (Linnaeus, 1761) [WoRMS]
Gavia Forster, 1788 [WoRMS]
Larus argentatus Pontoppidan, 1763 [WoRMS]
Larus canus Linnaeus, 1758 [WoRMS]
Larus fuscus Linnaeus, 1758 [WoRMS]
Larus marinus Linnaeus, 1758 [WoRMS]
Larus minutus Pallas, 1776 [WoRMS]
Melanitta nigra (Linnaeus, 1758) [WoRMS]
Morus bassanus (Linnaeus, 1758) [WoRMS]
Podiceps cristatus (Linnaeus, 1758) [WoRMS]
Rissa tridactyla (Linnaeus, 1758) [WoRMS]
Stercorarius skua (Brünnich, 1764) [WoRMS]
Sterna hirundo Linnaeus, 1758 [WoRMS]
Sterna sandvicensis Latham, 1787 [WoRMS]
Uria aalge (Pontoppidan, 1763) [WoRMS]
Parameters
Seabird density Methode
Seabird density: Transect-methode (Tasker et al., 1984) Ref.: Tasker, M.L., P.H. Jones, T.J. Dixon & B.F. Blake (1984). Counting seabirds at sea from ships: a review of methods employed and a suggestion for a standardized approach. Auk 101: 567-577. The ship counts were done by the so-called Transect-method (Tasker et al., 1984), for which all swimming birds were counted within a 300 m range from the ship and in an 90° angle from the front of the ship, and this during consecutive periods of 10 minutes each De scheepstellingen werden verricht volgens de zogenaamde transect-methode (Tasker et al., 1984), waarbij gedurende opeenvolgende periodes van 10 minuten alle zwemmende vogels worden geteld die zich binnen een afstand van 300 m van het schip en in een hoek van 90° vanaf de voorkant van het schip bevinden. Seabird density: Snapshot-methode (Tasker et al., 1984) Ref.: Tasker, M.L., P.H. Jones, T.J. Dixon & B.F. Blake (1984). Counting seabirds at sea from ships: a review of methods employed and a suggestion for a standardized approach. Auk 101: 567-577. The Snapshot-method (Tasker et al., 1984). is used for the standardized counts of flying birds. All birds flying in a 300 by 300 meters quadrant in front of ths ship are counted every minute. These counting results can be converted to seabird densities by taking the speed of the shipe into account. Voor het gestandaardiseerd tellen van vliegende vogels is de snapshot-methode gehanteerd (Tasker et al., 1984). Hierbij worden iedere minuut alle vliegende vogels geteld die zich binnen een kwadrant van 300 op 300 meter aan de voorkant van het schip bevinden. De resultaten van deze tellingen kunnen via de snelheid van de boot worden omgerekend naar dichtheden van zeevogels. Bijdrage door
Vlaamse overheid; Beleidsdomein Omgeving; Instituut voor Natuur- en Bosonderzoek (INBO), meer, data eigenaar
Vlaamse overheid; Beleidsdomein Leefmilieu, Natuur en Energie; Instituut voor Natuur- en Bosonderzoek; Afdeling Biodiversiteit en Natuurlijk Milieu; Onderzoeksgroep Ecosysteemdiversiteit, meer, data creator
Gerelateerde datasets
Project
Publicatie
Gebaseerd op deze dataset
Stienen, E.W.M.; Van Waeyenberge, J.; Seys, J.; Offringa, H.; Meire, P.; Kuijken, E. (2002). Seabirds in Belgian marine waters: implications for policy and management (poster), in: Mees, J. et al. (Ed.) VLIZ Young Scientists' Day, Brugge, Belgium 13 March 2002: book of abstracts. VLIZ Special Publication, 7: pp. 43, meer
Dataset status: Afgelopen
Data type: Data
Data oorsprong: Onderzoek
Metadatarecord aangemaakt: 2005-12-20
Informatie laatst gewijzigd: 2010-11-05
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