Distribution and trends
Distribution
seabird trend
Data derived from systematic counts of migrating individuals. For each location the hourly average number of birds are given. Seasons run from July to June.
Population trends
seabird trend
Data derived from systematic counts of migrating individuals. For each season, the hourly average number of birds (red dots), the trend line (dark blue) and associated standard error (light blue lines) are given. Seasons run from July to June.
- vanaf 1994
- significant decrease, <5% a year (-)
- laatste 12 jaar
- significant decrease, <5% a year (-)
Breeding success and survival
Not enough data.
Seasonal occurrence
seasonal pattern
Data derived from systematic counts of migrating individuals. Shown is the monthly average number of birds for for the last five seasons. For each month is indicated which part is counted flying to the left or to the right.
Occurrence description
Buiten broedtijd
Vorkstaartmeeuw is een schaarse doortrekker. De soort wordt vrijwel uitsluitend tussen eind augustus en begin december gezien, met name in september-oktober. De vroegste vogels zijn relatief vaak in volwassen kleed, gevolgd door vooral onvolwassen exemplaren. Verreweg de meeste vogels zijn te zien aan de kust bij krachtige aanlandige winden. Waarnemingen diep in het binnenland zijn extreem zeldzaam.
Birds directive
Conservation status
No conservation status of this species is available.
Assigned areas
No areas assigned
Counting guidelines
No counting guidelines available.