Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse

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Cachinnans - nest Lelystad 253

General remarks:

  • Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
  • Nest 253 positioned on dam 2 central section: two nests at 1 mtr distance, 'behind' nest 17 (only visible from north), the other neighbour is nest 223.
  • ID certain in 2023: both parents are cachinnans, male is sub-adult (4CY).
location April 26th, 2023: nest location dam 2. April 26th, 2023: full clutch, with 3 eggs. .
   
partner 1 April 27th, 2023: 4CY male cachinnans. April 27th, 2023: 4CY male cachinnans. .
   
partner 2 April 27th, 2023: adult female cachinnans. April 27th, 2023: adult female cachinnans. .
   
pullus May 18th, 2023: pullus g[7|0]. July 15th, 2023: fledged g[7|1]. July 8th, 2023: fledged g[7|Z].
 

Data for nest 253-2023:

egg sizes & volume 2023
SPECIES NEST A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST:
cach x cach 253-2023 77,7 48,3 91,27 75,3 49,4 92,52 74 50,8 96,15 279,94
ring pulli: May 25 laying A egg: April 20 hatch A egg: May 18
     
catch: date: darvic: metal: mass: head+bill: wing: bill: gonys: greytone:
Pullus 18-5-2023 g-7|Z 5.556.418 115 59,4
Pullus 18-5-2023 g-7|0 5.556.419 74 52
Pullus 18-5-2023 g-7|1 5.556.420 85 54
Pullus 27-5-2023 g-7|Z 5.556.418 474
Pullus 27-5-2023 g-7|1 5.556.420 382
Pullus 18-6-2023 g-7|Z 5.556.418 1057 126,0 294
Pullus 18-6-2023 g-7|1 5.556.420 1153 113,1 281 with 2x sibling
Pullus 25-6-2023 g-7|1 5.556.420 1089 127,3 339
 
253-2023
dam: dam 2 central
location: 1 mtr W of nest 223, and 7 mtr N 17, only visible from N-side.
breeders: cach x cach
OBSERVATIONS:
26-4-2023 location: two nests at 1 mtr distance, 'behind' nest 17 (only visible from north).
nest: 3 eggs. Measured and water test: A 40 - tip bottom
B 30 - tip bottom
27-04-2023 adult: 4CY cach and adult cach C 30 - tip bottom
11-05-2023 nest: 3 eggs
18-05-2023 pulli: 3 chicks ringed
27-05-2023 pulli: 2x control.
18-06-2023 pulli: g-7|Z & g-7|1 trapped for control. 3rd chick in group, no view on code, but likely g-7|0. Fledged: 3 chicks.
25-06-2023 pulli: 2 chicks g-7|Z and g-7|1 (caught from group of 3, maybe his other 2 brothers.)