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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Project Info
Location Lelystad
Location De Kreupel
2019 Lelystad
2020 Lelystad
2021 Lelystad
Coded nests Lelystad
2020 De Kreupel
2021 De Kreupel
Coded nests De Kreupel
All ring codes 2020
All ring codes 2021

Lelystad 2022:

Lelystad 2023:

Cachinnans - nest Lelystad 229 (was yX56A in 2023)

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 229 positioned on dam 2: 25 mtr east of lighthouse, old Spoonbill nest, between bushes = nest 229-2022 of sub-adults.
  • ID certain in 2022: both immature (4CY) cachinnans.
  • ID certain in 2023: location now occupied by female is y-X56A (from nest 206-2022). Partner is adult male cachinnans.
location April 29 2022: nest location in bushes. April 29 2022: old nest of Spoonbill. April 27 2023: location of nest.
 
eggs April 29 2022: 2 eggs. May 11 2023: egg hatching. .
  s
partner 1 April 29 2022: with tiny mirror on P9. June 17, 2022: partner 1. June 21, 2022: partner 1.
 
partner 1 May 13 2023: male cachinnans, was partner 1-2022? May 13 2023: male cachinnans partner. .
   
partner 2 May 04 2022: both parents in territory (front is partner 2). May 04 2022: parent 2 is cachinnans. May 04 2022: cachinnans, with larger P9 mirror.
 
partner 2 April 09 2023: cachinnans y-X56A. April 27 2023: cachinnans y-X56A. April 27 2023: cachinnans y-X56A.
 
pullus cachinnans r-7.Y fledged in 2023. cachinnans r-7.8 fledged in 2023. cachinnans g-7|U fledged in 2023.
 

Visits and data:

nest 229-2022 date A egg: April 15 hatch A egg: May 13 ring chicks: May 22
     
29-04-22 2 eggs A egg 70,8 47,3 tip bottom - 90 gr flag placed on branch in bush.
B egg 68,2 48,7 tip bottom - 90 gr old nest of Spoonbill, right in the bushes, 25 mtr E oif lighthouse.
01-05-22 1 sub-ad cachinnans at nest 229.
04-05-22 2 sub-adult cachinnans both present at nest 229.
09-05-22 3 eggs
17-05-22 3 eggs, 3rd egg never measured.
17-05-22 2 sub-adults present, with 2x unringed chicks.
partner 1 aggressive.
21-06-22 2 parents + 2 unringed chicks. Conclusion: 2x fledged chicks from nest 229-2022.
 
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: known parents?
cach x cach 229-2023 74 50 93,15 72,7 50,5 93,35 70,2 51,5 93,75 280,24 X56A &cach
ring pulli: 15-mei laying A egg: 10-apr hatch A egg: 8-mei
     
catch: date: metal: darvic: mass: wing: head+bill:      
pullus 11-5-2023 5.556.455 r-7Y -- -- --
pullus 11-5-2023 5.556.456 r-78 -- -- --
pullus 18-5-2023 5.556.410 g-7|U 166 -- 63
pullus 18-5-2023 5.556.455 r-7Y 221 -- 65
pullus 27-5-2023 5.556.410 g-7|U 362 -- --
pullus 27-5-2023 5.556.455 r-7Y 499 -- --
pullus 25-6-2023 5.556.456 r-78 1028 355 128,1
   
229-2023 y[X56A] is breeding in 229 (X56A was at nest 206 in 2022)
dam: dam 2 west
location: 25 mtr east of lighthouse, old Spoonbill nest, between bushes = nest 229-2022 of sub-adults.
breeders: cach x cach
OBSERVATIONS:
09-04-2023 y-X56A present north of dam. (27/4: yX56A not breeding at this nest in 2023).
26-04-2023 eggs: 3 eggs. Measured and water test: A/B/C:all are 90 - tip bottom.
nest: code 229 sprayed on entrance block.
27-04-2023 adult: parent 1 = yX56A
11-05-2023 pulli: 2 chicks ringed, 3rd egg hatching.
13-05-2023 adult: partner 2 is cach.
18-05-2023 pulli: 2 chicks present (R-7Y and unringed one, which is now ringed).
27-05-2023 pulli: 2x ringed birds measured: g-7|U & r-7Y.
18-06-2023 adult: ad yX56A easy at bread.
25-06-2023 pulli: r-78 and g-7|U present.