Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
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Breeding biology
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Caspian Gull cachinnans 8|A 1CY-3CY, 2023-2025, England & the Netherlands. Picture: Martin Casemore, Thijs Horst & Mars Muusse.
Tibia ring G-8|A and metal NLA 5.625.191, ringed as pullus Larus cachinnans on May 27 2023 in nest n-F|8 at Lelystad, the Netherlands. Ringed by Merijn Loeve / Roland-Jan Buijs ringing team.
Recoveries:
27-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
26-06-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
08-07-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
15-07-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
18-11-2023 Dungeness (Strand), Kent, ENGELAND 5.054,00 N 58,00 E colourring read Martin Casemore
20-04-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
Visits and data for 2023
egg sizes & volume 2023 |
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SPECIES |
NEST |
A_length |
A_width |
A_volume |
B_length |
B_width |
B_volume |
C_length |
C_width |
C_volume |
TOTAL NEST: |
known parents? |
cach x cach |
nF|8 |
72,2 |
52,2 |
99,06 |
71,1 |
49,1 |
86,30 |
71 |
51,1 |
93,35 |
278,71 |
new nest |
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ring pulli: -- |
laying A egg: -- |
hatch A egg: -- |
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catch: |
date: |
metal: |
darvic: |
mass: |
wing: |
head+bill: |
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Pullus |
18-05-2023 |
5.556.417 |
g-7|Y |
163 |
-- |
64,3 |
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Pullus |
27-05-2023 |
5.556.417 |
g-7|Y |
470 |
-- |
-- |
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Pullus |
27-05-2023 |
5.625.191 |
g-8|A |
487 |
-- |
-- |
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n-F|8 |
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dam: |
dam 2 central. |
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location: |
Dam 2 central, 8 mtr NW of 17, only visible from N side. Behind red crate, close to bushes. Code sprayed. |
breeders: |
cach x cach |
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OBSERVATIONS: |
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27-04-2023 |
adult: |
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30-04-2023 |
nest: |
3 eggs. Measured. Watertest: |
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A: 1 mm - floating |
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adult: |
nF8 breeding. Later: unringed partner. Both large birds. |
B: 2 mm - floating |
11-05-2023 |
nest: |
3 eggs hatching |
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C: 1/2 way - floating |
18-05-2023 |
pulli: |
1 chick ringed, other 2 not found |
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27-05-2023 |
pulli: |
1x control, 1x new chick ringed |
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25-06-2023 |
pulli: |
g-7|Y, g-8|A and n-F|8 present |
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below: Caspian Gull cachinnans 8|A 3CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
.JPG)


below: Caspian Gull cachinnans 8|A 1CY, November 18 2023, Dungeness, England. Picture: Martin Casemore.

below: Caspian Gull cachinnans 8|A 1CY, July 15 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.


below: Caspian Gull cachinnans 8|A 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.



below: Caspian Gull cachinnans 8|A 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

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