Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Caspian Gull cachinnans 7.B 1CY-2CY, May 2022 - July 2023, the Netherlands & France. Picture: Maarten Hotting, Thijs Horst, Mars Muusse & Geoffroy Chabot.
Red tibia ring r[7.B] and metal NLA 5.625.183, ringed as pullus Larus cachinnans at nest n[F|N] on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs/Albert de Jong.
Recoveries:
15-08-2022 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Willem van der Waal
15-01-2023 Tarnos (Haven), Landes, FRANKRIJK 4.331,00 N 130,00 W colourring read Geoffroy Chabot
27-04-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
19-06-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
25-06-2023 Markermeer (Marker Wadden), Flevoland, NL 5.235,00 N 522,00 E colourring read Maarten Hotting
14-07-2023 Markermeer (Marker Wadden), Flevoland, NL 5.235,00 N 522,00 E colourring read Maarten Hotting
ID certain in 2022: mother is Caspian Gull cachinnans, father is 4CY (hybrid?) Caspian Gull cachinnans n[F|N].
| date | |||||||
| 12-04-2022 | Cachinnans-type n-F|N guarding high on dam 2. | ||||||
| 01-05-2022 | Cachinnans-type n-F|N walks from nest in small bush, high on dam 2. Below him is nest 061Z. | ||||||
| Cachinnans female landed next to n-F|N, and this femaler is ringed on tarsus! (in retrospect: never seen again this bird). | |||||||
| 04-05-2022 | Two adults at nest. Female cachinnans and 4CY n-F|N. | ||||||
| 3 eggs | egg no: | width (mm) | length (mm) | volume (cm3): | water test on May 4th: | ||
| A egg | 49,9 | 74 | -- | -- | |||
| B egg | 47,9 | 68,5 | -- | -- | |||
| C egg | 50 | 71 | -- | -- | |||
| 09-05-2022 | 3 eggs. We trapped n-F|N at the nest. No measurements taken. | ||||||
| 17-05-2022 | 3 eggs. | ||||||
| 22-05-2022 | 3 eggs. | ||||||
| 30-05-2022 | n-F|N at nest. 2 chicks. | ||||||
| pullus | metal | darvic | mass | wing | H+B Bill | ||
| .5625183 | r-7.B | 87 | 25 | 53,9 18,4 | |||
| pullus | 1 pullus dead in nest. | ||||||
| 02-06-2022 | Cachinnans-type n-F|N defending nest. | ||||||
| 17-06-2022 | Cachinnans-type n-F|N at nest. | ||||||
| 21-06-2022 | Nest empty, Chick r-7.B not found in vegetation. | ||||||
| 12-07-2022 | Photographed r-7.B. | ||||||
| In 2022 one chick ringed in this nest: r-7.B. | |||||||
below: Caspian Gull cachinnans 7.B 2CY, July 14 2023, Markermeer, the Netherlands. Picture: Thijs Horst & Maarten Hotting.
below: Caspian Gull cachinnans 7.B 2CY, April 27 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.B 2CY, January 12 2023, Tarnos - Landes, France. Picture: Geoffroy Chabot.
below: Caspian Gull cachinnans 7.B 1CY, July 12 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.B 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
r[7.B] cachinnans from nest n[F|N]. Picture: May 30th, 2022.
Ringed May 30th. No confirmation on 2 other eggs.
