IJmuiden Project - Fred Cottaar & Kees Verbeek

(last update: September 29, 2011)

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Lesser Black-backed Gulls & Herring Gulls (Larus fuscus & L. argentatus).

rings 2008 - 2011

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Many years gulls have been ringed at IJmuiden, the Netherlands. The IJmuiden Ringing Team (Fred Cottaar & Kees Verbeek) have been ringing Herring Gulls and Lesser Black-backed Gulls at Forteiland, IJmuiden in 2008-2011. Green darvic rings have been attached, starting with Y for both species (so codes read Y.xxx).
Early in the season (May), when birds have full nests, adult Lesser Black-backed Gulls and Herring Gulls have been caught at the nests and ringed. Later in the breeding season (June), the juveniles (of both species) have been caught and ringed as well by Fred and Kees.

The pages on this website show examples of birds from this IJmuiden project. We also show ring codes that have been used in previous years. Furthermore, some birds with similar ring codes from Texel, Vlieland or Leiden are included. All observations of ringed birds from these projects can be sent to Kees Camphuysen at NIOZ, Texel (mail camphuys at nioz dot nl). By clicking the thumbnails below, you will find enlarged pictures of these birds. By clicking the Excel logo (right box) you will find an example Excel Sheet with the reports of earlier sightings of adult Herring Gull Y.AAK from the excel database, as will be sent to you after reporting rings to Kees Camphuysen.

Read more about the location: IJmuiden.
Observations of ringed birds can be sent to Kees Camphuysen at NIOZ, Texel (mail camphuys at nioz dot nl). Click the Excel logo for the life history of Herring Gull Y.AAK and find the report of earlier sightings.
Read more about the 2007 ring activities by Fred Cottaar & Kees Verbeek on Forteiland, IJmuiden. (Word document 4,5Mb, in Dutch with tables and plots). Recent addition: PDF Forteiland 2011 in Dutch with graphs.
Read more on the NIOZ website about ringing projects on Texel, Vlieland, Leiden and the Dutch delta administrated by Kees Camphuysen.
Read more about the history of ringing programmes in Holland and the results throughout the years. An article prepared for the magazine Sula by Kees Camphuysen (in Dutch, with English summary; PDF-file 1160 Kb).

Forteiland - IJmuiden

Many Herring and Lesser Black-backed Gulls used to breed along the coast in the dunes, but nowadays most are roof-top breeding birds. Buildings with adequate roof-tops in the fish-industry complex of IJmuiden have been occupied, and recently gulls are spreading to roof-tops in cities as well. The change in breeding habitat has much to do with predation of Red Fox in the dunes.

Forteiland (see picture) is an isle where the Fox was not found in the 1980's. Up to 1988 the colony increased but then, in the breeding season of 1988, one Fox managed to reach this island. Apparently, gulls have good memories as the island was abandoned for 15 years; it lasted to 2003 when finally the island was occupied by gulls again. In 2007, number of breeding pairs approximately levels numbers in 1988. However, Lesser Black-backed Gull has now become the common species, while this used to be Herring Gull in the 1980's.

Nowadays, Forteiland is the last place where ground breeders can be found at IJmuiden. Due to construction works and disturbance of some colonies, the importance of the Forteiland colony is growing. From 2003, numbers of breeding birds increase annually. Ring recoveries show birds arrive from other colonies in IJmuiden, but also from Moerdijk, Maasvlakte and Texel. For the next years, more construction works are planned in IJmuiden harbour, e.g. for the Middensluis Complex, unfortunately hosting a large colony of both Herring and Lesser Black-backed Gulls. hence, for the coming years it is expected many more gulls will search for new nesting areas, and will find their way to Forteiland.

1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AAH 11cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AAK adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.AAS adult (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ABY adult (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ACB 10cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ACU 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ACW 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ACY 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ADF 2cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ADH 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ADJ 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ADM 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ADN 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ADP 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ADY 1cy & 2cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AFC 1cy & 4cy (argenteus)
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Similar green rings from Texel, Vlieland & Leiden
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P.CHU K.BAT & K.BAX

F.AAN K.JAZ
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Older project rings from IJmuiden: single digit/letter/bars, green & red rings Exxx and metal rings
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=3

ring left & ring right combinations for hybrid fuscus x michahellis

=P & 9H

ring left & ring right combinations for fuscus

E486

red rings for hybrid fuscus x michahellis

9=

ring left & ring right combinations for fuscus

CV7

green rings for hybrid fuscus x michahellis

NLA 5.277.846

metal rings for fuscus and argentatus

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Results for 2011

The ringing team IJmuiden presents an annual report every September, to show the results of the breeding season. You will find a few tables from this 2011 report below.

Table 3: In one decade of monitoring, 2011 was the first time showing lower number of nests than the previous year. This was for the first time since re-colonisation in 2003. In 2011, 903 pairs of Lesser Black-backed Gulls and 113 pairs of Herring Gulls were counted. When compared with 2010 (1004 and 172 nests respectively) this is a decrease of 10,1% and 34,3% for both taxa. Mid March until Mid April, the colony faced heavily disturbances, resulting in all gulls leaving the island for over an hour on some days. This disturbance could not be located, but it may have contribiuted to the decrease in numbers for 2011.

Table 4: 2011 was the first year Fred and Kees saw good numbers of locally ringed young birds reappearing at the breeding site. Table 4 gives the ring codes seen in 2011 and the "ring datum", which is the date the bird was ringed as pullus. Birds ringed in 2008 are in 4cy by 2011 and potentially start breeding in the colony. This is illustrated by Lesser Black-backed Gull Y.ADU which was breeding a nest with eggs. But also Herring Gull Y.ACW and Lesser Black-backed Gull Y.ADX were very territorial and are suspected to have been breeding. But most other near adult birds just lingered around in the colony, as if they were starting to learn the rules how to behave. Y.ALB and Y.AMF are two very young Herring Gulls hanging around in the colony, also seen many times here outside the breeding season.

Table 5: Observations in 2011 of Lesser Black-backed Gulls which were not ringed at Forteiland. As with many colonies, Forteiland also holds "foreign" birds, recruits which migrated for whatever reason to this place. Some just visit the colony, while others really start a pair and breed. The second column in table 5 "Status" indicates if the bird was:
p: visitor
-: status not known
b: possibly breeding
B: definitely breeding.
Last column in table 5 "Plaats" gives the origin of the bird. Apparently Lesser Black-backed Gulls from all over the North Sea Bassin can be expected in the colony. Interestly, despite the very intense ringing program in S Norway and the tremendous number of ringed intermedius Lesser Black-backed Gulls that pass in spring and autumn at IJmuiden beach, there are no records for birds from this colony. So far, new recruits have only been registered from graellsii colonies. The explanation for the high number of rings from Maasvlakte / Europoort may have two reasons: a. this ringing project has been very extensive, with over 10.000 rings; and b. at the moment, many construction works are gfoing on and large parts of the colonies at Maasvlakte / Europoort are no longer available.

1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.AFD 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AFJ 2cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AFK 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AFL adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AFM adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AFP adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AHA adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AHB adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AHC adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.AHJ adult (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AHY adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AJP adult (argenteus). Formerly J=; now partner of Y.AHB.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AKS adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.AKU adult (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.AKZ adult (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ALA 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ALB 1cy, 2cy & 3cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ALP 2cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ALS 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ALW 2cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ALX 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.AMC 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AMF 1cy (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.AMM 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.APF adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ARX 1cy (graellsii)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ASD adult (argenteus)
1cy argenteus in August, ringed in Belgium. (90559 bytes)Lesser Black-backed Gull Y.ATP 1cy (graellsii)