Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
Caspian Gull cachinnans 201:U 6CY-9CY, May 2021 - September 2024, De Kreupel & Almere, the Netherlands. Picture: camera trap, Thijs Horst & Mars Muusse.
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Coordinator: Leon Kelder.
Ringers: Roland-Jan Buijs, Leon Kelder & Merijn Loeve.
Ring data:
White ring 201:U and metal CZP CX1348, ringed as pullus Larus cachinnans on May 27 2016 at Pasohlávky, Jihomoravský kraj, Czechia (48°53'49"N 16°36'4"E) - ringer František Zicha.
White 201:U was observed in the Netherlands in it's first winter, but was also recorded back in Czechia in 3rd winter.
Nonetheless, it decided to start breeding in the recently established colony De Kreupel, in the Netherlands, as breeder of nest 201U 21 at island D, temporarily nest coded D04.
Recoveries:
2017-01-20, Hazepad, Breda, Noord-Brabant, The Netherlands | 51.618516; 4.768643 | 893 km | Jeroen Nagtegaal
2017-03-31, Zwenkauer See, Zwenkau, Leipzig, Germany | 51.233333; 12.316667 | 401 km | Andreas Krüger
2017-04-06, Haselbacher Teiche, Haselbach, Thüringen, Germany | 51.073333; 12.444167 | 383 km | Steffen Wolf
2019-12-13, vodní nádrž Modlany, (Modlany), Ústecký kraj, Czechia | 50.650827; 13.882856 | 276 km | Václav Beran
2021-05-20, Island De Kreupel, Enkhuizen, Noord-Holland, The Netherlands | 52.798673 5.22688 | 907 km | Leon Kelder
2021-05-24, Noorderkwelweg, Den Oever, Noord-Holland, The Netherlands | 52.897; 5.038 | 923 km | Fred Visscher
2022-02-02, Elzenburg, Oss, Noord-Brabant | NL09 | The Netherlands | 51.783; 5.539 | 847 km | Tim Raats
2022-05-26, IJsselmeer, De Kreupel, Noord-Holland | NL14 | The Netherlands | 52.7992; 5.2214 | 908 km | Leon Kelder
2023-09-28, Andijk, Noord-Holland | NL14 | The Netherlands | 52.755138; 5.205301 | 907 km | A.J. Laansma
2023-12-01, Almere, Flevoland, | NL-- | The Netherlands | 52.398851; 5.205057 | 892 km | Mars & Thijs Horst
2024-01-12, Almere, Flevoland, | NL-- | The Netherlands | 52.371706; 5.22161 | 889 km | Thijs Horst
2024-08-05, De Kreupel, IJsselmeer, Noord-Holland | NL14 | The Netherlands | 52.799111; 5.226389 | 907 km | Thijs Horst, Mars
Nest data for nest 201U-2021:
| Date: | details: | ||||||
| 23-4-2021 | 1 egg in nest. | egg no: | width (mm): | length (mm): | volume (cm3): | ||
| Attempt to trap breeding adult. Failed. | A egg | 50.6 | 73.8 | ||||
| 14-5-2021 | 2 eggs in nest. | ||||||
| 2 adults near nest. One ringed w[201:U]. | |||||||
| https://waarneming.nl/observation/214662645/ | |||||||
| 20-5-2021 | 1 egg hatching & 1 chick. | metal: | tibia: | mass (gr): | head + bill: | tarsus: | |
| Prey: 1x Roach. | NLA 5.556.757 | b-D|0 | 75 | 48.6 | 27.8 | ||
| https://waarneming.nl/observation/214707336/ | |||||||
| Camera trap near nest: 1 pullus & 2 adults. | |||||||
| https://waarneming.nl/observation/223648760/ | |||||||
| 28-5-2021 | 2 chicks in nest. | metal: | tibia: | mass (gr): | head + bill: | tarsus: | |
| Unringed male Caspian & w[201:U] female Caspian. | NLA 5.556.757 | b-D|0 | 231 | 66.7 | 41.6 | ||
| NLA 5.556.771 | r-B.2 | 168 | 61.2 | 36.2 | |||
Again breeding at de Kreupel, in 2022: nest D7-2022 on island D. Data for this nest:
| Date: | Egg code | Height (mm) | Width (mm) | Comments | Metal NLA | Colour ring | Wing (mm) | Head+ bill (mm) | Bill (mm) | Mass (gr) | Tarsus | Gonys | Swab no |
| 29-4-2022 | 3 eggs | ||||||||||||
| trapped adult Herring Gull | 6214039 | Red 0.H | 419 | 109.5 | 47.8 | 791 | 62.4 | 18.6 | 1073 | ||||
| 13-5-2022 | 3 eggs | ||||||||||||
| 26-5-2022 | 1 pullus in nest | 5623606 | Red 4.F | 50.7 | 90 | ||||||||
| Caspian Gull w-201:U alarming over nest location |
below: Caspian Gull cachinnans 201:U 9CY, September 07 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 201:U 8CY, December 01 2023, Almere - De Vaart, the Netherlands. Picture Mars Muusse.
below: Caspian Gull cachinnans 201:U 6CY, May 20 2021, De Kreupel - L, the Netherlands. Picture: camera trap.
