Evolution of populations of coastal breeders at the inner port of Zeebrugge: breeding success [Evolutie van populaties van kustbroedvogels in de voorhaven van Zeebrugge: broedsucces]
Citation
Data Institute for Nature Conservation. https://marineinfo.org/id/dataset/36
Availability: Unrestricted after moratorium period
Data are initially restricted, but the access condition relaxes to academic or unrestricted once a specified period of time after an event (such as collection, publication, completion of QC procedures or project cessation) has elapsed Description
Dataset as a result of determining breeding success and biometrics of eggs and chicks within 30 to 40 enclosed (chicken wire 50 cm height) nests in the outer harbour of Zeebruges. more
From the moment onwards that the birds are landing on the breeding sites on a regular basis and the digging of nest holes is observed, the breeding sites in Zeebruges are regularly checked for the presence of eggs. The date of the first encounter of eggs in the nest is noted. The nests are marked with a (bamboo) stick and a label containing the nest number. The eggs are marked using permeable inkt by writing the egg and nest number on the top of each egg. This makes it possible to determine afterwards wheter an egg has hatched or has been predated. The marked nests are checked at regular time intervals. All possible information on the fate of the eggs is noted. This way it is possible to keep track of the eggs and nests and to determine things like hatching and breeding succes of the marked nests. Chick weight is measured with an electronic balance to a precision of 1 g. Egg size, total head length and stretched wing chord is measured using a calliper with precision of 0,1 mm. At certain locations enclosures are placed around concentrations of marked nests. This method is applied to keep the chicks of semi-nest leavers on a fixed location so they can be easily observed and retrieved until the moment of flying out. An enclosure is a fence of chicken wire (+/-50 cm height) that is attached to wooden bars surrounding a number of nests. At the bottom of the fence at the inside of the enclosure a folio (20cm height) is attached to prevent the chicks from damaging theirselfs. The chicken wire has to be doug into the ground for a few centimeters to prevent the chicks to escape. Maximum once in the 2 or 3 days and minimum once a week, the chicks in the enclosures are checked. Chicks that are over 20 days old at the moment of checking and that have dissapeared from the enclosure, are considered to have flown out. If they are already missing at an earlier age, they are noted as ‘disappeared’. In most cases this means they have been predated. The enclosure method is applied in several European colonies and this makes the data immediately comparable. Scope Themes: Biology, Biology > Birds, Coastal studies (e.g. shores, estuaries) Keywords: Marine/Coastal, Terrestrial, Birds, Birds (marine), Breeding birds, Breeding success, Clutch size, Stock assessment, ANE, Belgium, Belgian Coast, ANE, Belgium, Brugge, Zeebrugge, Larus ridibundus Linnaeus, 1766, Sterna hirundo Linnaeus, 1758, Sterna sandvicensis Latham, 1787 Geographical coverage ANE, Belgium, Belgian Coast [Marine Regions] ANE, Belgium, Brugge, Zeebrugge [Marine Regions] Temporal coverage
May 2002 - 21 July 2002 May 2003 - 21 July 2003 Taxonomic coverage
Parameters
Biometrics of chicks Methodology
Breeding success Methodology Clutch size Methodology Egg size Methodology Fledging success Methodology Hatching success Methodology Biometrics of chicks: Measuring of weight and total head length Chick weight is measured with an electronic balance to a precision of 1 g. Total head length is measured using a calliper with precision of 0,1 mm. Breeding success: Calculation of breeding succes Product of: clutch size * haching success * fledging succes. Clutch size: Count of eggs per nests Number of eggs per nest are counted in 30 to 40 individual enclosed nests in a representative area of the colony. Counted nests are marked and counted eggs are marked. Egg size: Measuring of maximum length and width measurements are carried out using a calliper at a precision 0,1mm. Fledging success: Count of % of hatched eggs that actually fledged Cause of loss is noted: predation, found death (starvation or dehydratation). Rule for success of fledging is that winglength exceeds 160 mm for Common tern and 180 mm for Sandwich tern and Black headed gull. Hatching success: Count of percentage of hatched eggs Cause of loss are noted: predation, trampling, flooding. Hachlings are ringed individually within 3 days from hatching. Contributors
Related datasets
Parent dataset: Evolution of populations of coastal breeders at the inner port of Zeebrugge, more Child datasets: Evolution of populations of coastal breeders at the inner port of Zeebrugge: breeding success: biometry of chicks, more Evolution of populations of coastal breeders at the inner port of Zeebrugge: breeding success: eggsize, more (Partly) included in: PROJECT DATA: Integrated data from projects PODOI and Trophos (1997-2006), more Project
TROPHOS: Higher trophic levels in the Southern North Sea, more
Grant agreement ID EV/25
Publication
Based on this dataset
Provoost, S.; Stienen, E.; De Bruyn, L.; Herrier, J.-L. (2003). Kust, in: Dumortier, M. et al. Natuurrapport 2003: toestand van de natuur in Vlaanderen: cijfers voor het beleid. Mededelingen van het Instituut voor Natuur- en Bosonderzoek, 21: pp. 117-121, more
Van Waeyenberge, J.; Stienen, E.W.M. (2002). Broedsucces van sternen in de Zeebrugse voorhaven: overzicht van enkele resultaten van de Visdief. Vogelnieuws 1(3): 16-20, more
Van Waeyenberge, J.; Stienen, E.W.M.; Kuijken, E. (2002). Toekomstperspectieven voor kustbroedvogels in de voorhaven van Zeebrugge: adviesnota in het kader van de instandhouding van de populaties van kustbroedvogels. Advies van het Instituut voor Natuurbehoud, A.2002.231. Instituut voor Natuurbehoud: Brussel. 34 pp., more
Dataset status: Completed
Data type: Data
Data origin: Research
Metadatarecord created: 2004-05-10
Information last updated: 2010-11-05
| ||||
