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 0.03 (was X65C in 2019, then 0.C in 2022) 4CY-7CY, 2022-2025, the Netherlands. Picture: Leon Kelder, Thijs Horst & Mars Muusse.
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2019:
Tarsus ring y-X65C and metal Hiddensee EA222865, ringed as pullus Larus cachinnans on June 01 2019 at Kiesgrube Laußig, Germany.
2022:
Trapped at the nest, male incubating eggs, on April 29 2022 at
nest M6 on island M - De Kreupel, Holland (5247.00 N, 513.00 E).
Metal ring not replaced, but now red tibia ring R-0.C. Ringer: Roland-Jan Buijs. Partner in 2022 was unringed female Larus cachinnans.
2023:
Again trapped at the nest, male incubating eggs on April 22 2023 at
nest M9 on island M - De Kreupel, Holland (5247.00 N, 513.00 E).
Rings replaced.
Tarsus ring y-0.03 and logger 6395, ringed as breeding 5CY male Larus cachinnans.
Ringer Kees Camphuysen & Leon Kelder. See UvA-BITS for logger details.
Recoveries:
| Ring | Year | Mm | Dd | Location | Lat | Long | Observer | NOTES | ||
| X65C | 2019 | 06 | 01 | Kiesgrube Laußig, Germany | FRG | 51,6 | 12,6 | Hiddensee | Bird Ringing Centre | Hiddensee Bird Ringing Centre, as chick, yellow X65C deployed, metal ring at the time still 222865 |
| X65C | 2020 | 01 | 03 | Steinhude, | FRG | 52,5 | 9,4 | Hiddensee | Bird Ringing Centre | Yellow X65C, metal ring at the time still 222865 |
| X65C | 2020 | 02 | 04 | Braunschweig, | FRG | 52,3 | 10,4 | Hiddensee | Bird Ringing Centre | Yellow X65C, metal ring at the time still 222865 |
| X65C | 2020 | 05 | 01 | Zwolle, Overijssel | NL | 52,5 | 6,0 | Hiddensee | Bird Ringing Centre | Yellow X65C, metal ring at the time still 222865 |
| X65C | 2020 | 09 | 22 | Oostvaardersplassen, | NL | 52,5 | 5,3 | Hiddensee | Bird Ringing Centre | Yellow X65C, metal ring at the time still 222865 |
| X65C | 2021 | 06 | 02 | Döllnitzsee, Sachsen | FRG | 51,3 | 12,9 | Hiddensee | Bird Ringing Centre | Yellow X65C, metal ring at the time still 222865 |
| X65C | 2021 | 11 | 12 | Deventer, Overijssel | NL | 52,3 | 6,2 | Hiddensee | Bird Ringing Centre | Yellow X65C, metal ring at the time still 222865 |
| X65C | 2022 | 01 | 13 | Grou, Friesland | NL | 53,1 | 5,8 | Hiddensee | Bird Ringing Centre | Yellow X65C, metal ring at the time still 222865 |
| 0.C | 2022 | 04 | 29 | De Kreupel eiland M | NL | 52,8 | 5,2 | Leon | Kelder | Yellow X65C removed and replaced with tibia red 0.C, metal ring at the time still 222865 |
| 0.C | 2022 | 05 | 12 | De Kreupel eiland M | NL | 52,8 | 5,2 | Leon | Kelder | camera trap nest M6 with partner and three colour-ringed chicks, metal ring at the time still 222865 |
| 0.C | 2023 | 04 | 22 | De Kreupel eiland J | NL | 52,8 | 5,2 | GPS | Receiver station | Preening at roost island after release |
| 0,03 | 2023 | 04 | 22 | De Kreupel eiland M | NL | 52,8 | 5,2 | C.J. | Camphuysen | Nest M9 11:53-12:33, swab, blood, moult, ringed, GPS 6395 attached - was Hiddenzee EA222865 tibia red 0.C (re-ringed) |
| 0,03 | 2023 | 04 | 22 | De Kreupel eiland M | NL | 52,8 | 5,2 | GPS | Receiver station | Quickly returned to nest site |
| 0,03 | 2023 | 04 | 24 | De Fluezen, Koudum (F) | NL | 52,9 | 5,5 | GPS | Receiver station | morning foraging trip into Friesland, furthest point near Koudum |
| 0,03 | 2023 | 06 | 19 | Vooroever Wervershoof | NL | 52,7 | 5,1 | Jeroen van | Assema | Reported on waarneming.nl yellow as E0-0? |
| 0,03 | 2023 | 07 | 03 | De Kreupel eiland E | NL | 52,8 | 5,2 | Camera | Trap observation | Photo provided |
| 0,03 | 2024 | 03 | 03 | De Kreupel | NL | 52,8 | 5,2 | Thijs | Horst | Gelokt met brood, geen plaats |
| 0,03 | 2024 | 08 | 05 | Vooroever Wervershoof | NL | 52,7 | 5,1 | Leon | Kelder | Photo provided |
| 0,03 | 2025 | 04 | 08 | De Kreupel | NL | 52,8 | 5,2 | Thijs | Horst | Gelokt met brood, geen plaats |
In 2023:
Nest is M9-2023 at island M.
Partner is female Larus cachinnans.
Offspring are: g-0|J, g-0|K & g-0|L.
In 2022:
Nest M6-2022 on island M. Data:
| Date: | Egg code | Height (mm) | Width (mm) | Comments | Metal NLA | Colour ring | Wing (mm) | Head+ bill (mm) | Bill (mm) | Mass (gr) | Gonys | Tarsus | Swab no |
| 14-04-2022 | A-egg | 73.6 | 50.5 | 3 eggs | |||||||||
| B-egg | 73.2 | 52.4 | |||||||||||
| C-egg | 73.6 | 50.5 | |||||||||||
| 29-04-2022 | 3 eggs | ||||||||||||
| trapped 4CY Caspian Gull | EA222865 | Red 0.C | 472 | 137.8 | 67.7 | 1363 | 20.1 | 77.7 | 1066 | ||||
| Was y-X65C & DEH EA222865 | |||||||||||||
| 13-05-2022 | 3 pulli in nest | 5623534 | Red 2.A | 58.9 | 127 | ||||||||
| 5623535 | Red 2.B | 59.1 | 132 | ||||||||||
| 5623536 | Red 2.D | 53.1 | 88 | ||||||||||
| 03-06-2022 | 1 pullus at nest | 5623534 | Red 2.A | 200.0 | 104.1 | 950 | |||||||
| 23-06-2022 | 1 juvenile in colony | 5623534 | Red 2.A | 362.0 | 129.4 | 1095 | 1273 | ||||||
| 12-05 - 14-05-2022 camera trap: | Caspian Gull male r-0C | ||||||||||||
| Caspian Gull female | |||||||||||||
below: Caspian Gull cachinnans 0.03 7CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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below: Caspian Gull cachinnans 0.03 6CY, March 30 - April 01 2024, from GPS data.
below: Caspian Gull cachinnans 0.03 6CY, March 03 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 0.03 5CY, November 05-07 2023, from GPS data.
Foraging in Zwanendiep, near two small islands.
below: Caspian Gull cachinnans 0.03 5CY, April 2023 - November 2023, from GPS data.
Plot left: data for the period between ringing (April 22 2023) and early November.
Plot right: data for
the month of October 2023. Trips at river IJssel.
below: Caspian Gull cachinnans 0.03 5CY, July 03 2023, colony De Kreupel - island E, the Netherlands. Picture: Leon Kelder - camera trap.
below: Caspian Gull cachinnans 0.03 5CY, April 22 - June 30 2023, from GPS data.
Feeding trips during incubation and chick raising period.
Many trips into SW Friesland, furthest point near Koudum.
