Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Herring Gull argenteus F.Y 1CY-4CY, June 2021 - June 2024, Almere & Lelystad, the Netherlands. Picture: Eric Roeland, Jeroen Nagtegaal & Mars Muusse.
Red tibia ring r[F.Y] & Arnhem NLA 5.550.695, ringed as pullus in Larus cachinnans cluster, but appeared to be Herring Gull Larus argentatus argenteus, ringed on June 26 2021 next to nest 61 in colony Lelystad, the Netherlands.
Ringer : Jeroen Nagtegaal, Roland-Jan Buijs ringing team.
Recoveries:
10-08-2021 Katwijk aan Zee (Binnenwatering), Zuid-Holland, NL 5.213,00 N 425,00 E colourring read Annelies Marijnis
08-03-2022 Blaringhem (Vuilstort), Nord, FRANKRIJK 5.040,00 N 224,00 E colourring read Jan Talloen
30-09-2022 Blaringhem (Vuilstort), Nord, FRANKRIJK 5.040,00 N 224,00 E colourring read Jan Talloen
17-10-2022 Blaringhem (Vuilstort), Nord, FRANKRIJK 5.040,00 N 224,00 E colourring read Jan Talloen
06-05-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
25-02-2024 Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 N 423,00 E colourring read Annelies Marijnis
18-03-2024 Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 N 423,00 E colourring read Annelies Marijnis
23-03-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
27-03-2024 Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 N 423,00 E colourring read Annelies Marijnis
31-03-2024 Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 N 423,00 E colourring read Annelies Marijnis
01-04-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
25-06-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
below: Herring Gull argenteus F.Y 4CY, June 25 2024, Almere, the Netherlands. Picture: Mars Muusse.
below: Herring Gull argenteus F.Y 4CY, March 30 2024, Almere, the Netherlands. Picture: Eric Roeland.
Apparently, turrned out to be Herring Gull.
below: Herring Gull argenteus F.Y 1CY, June 26 2021, Lelystad, the Netherlands. Picture: Jeroen Nagtegaal & Mars Muusse.
ID of parents from nest 61 is certain in 2021, both are Caspian Gull cachinnans, mother is r-F.B.
There was a slight possibility this pullus r-F.Y was from an adjacent nest, and it appeared so, when it was reported back in later years.
Visits and data:
| date: | ||||||||
| 24-04-2021 | 2 partners present, both cachinnans. Nest allows trapping breeders, easily. | |||||||
| 2 eggs in nest. | ||||||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 24th: | ||||
| A egg | 50,8 | 71,8 | 93,29 | 30 - tip bottom | ||||
| B egg | 49,7 | 70,4 | 87,56 | 25 - tip bottom | ||||
| sum nest: | -- | |||||||
| 26-04-2021 | Both partners present, one guarding, one breeding. A female cachinnans with hanging left leg in flight is most probably NOT the breeding female. Is another cachinnans breeding here as well? | |||||||
| 13-05-2021 | Both partners present. Male has 5CY markings. Now the right female photographed in flight. | |||||||
| 3 eggs in nest. | ||||||||
| 15-05-2021 | 3 eggs in nest. | |||||||
| 28-05-2021 | 3 eggs in nest. | |||||||
| Cage placed and one bird (female) trapped for ringing. | ||||||||
| metal | tibia | mass | head + bill | wing | tarsus | bill | ||
| adult | .5559427 | r-F.B | 1030 | 124 | 454 | 69,7 | 59,8 | |
| 08-06-2021 | Both partners present. At least 2 chicks around. | |||||||
| metal | tibia | mass | head + bill | wing | ||||
| 26-06-2021 | pullus | .5550695 | r-F.Y | 649 | 90,4 | 157 | most likely cachinnans chick of nest 61. | |
| pullus | .5550696 | r-F.Z | 1126 | 111,8 | 260 | argentatus, near nest 61, from neighbouring nest. | ||
| pullus | .5550697 | r-F.1 | 1036 | 108,6 | 269 | argentatus, near nest 61, from neighbouring nest. | ||
| pullus | .5550698 | r-F.2 | 879 | 98,4 | 230 | argentatus, near nest 61, from neighbouring nest. | ||