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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Lelystad 2021
nest y-PNED
nest y-PLDP
nest y-PHSV
nest y-P:A02
nest y-P:U60
nest zy-MT
nest r-FB
nest r-FC
nest 001
nest 003
nest 006
nest 011
nest 012
nest 013
nest 014
nest 015
nest 016B
nest 017
nest 018
nest 019
nest 021
nest 034
nest 035
nest 038
nest 040
nest 041
nest 042
nest 044
nest 045
nest 046
nest 047
nest 048
nest 053
nest 055
nest 056
nest 058
nest 060
nest 062
nest 063
nest 065
nest 066
nest 067
nest 072

Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

Cachinnans - nest Lelystad 040

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 040 positioned at tip of T-split, near lighthouse, and in cluster with several Spoonbill nests. Therefore limited visits. Nest occupied: 2021-2023, same location.
  • In 2021: male is Caspian Gull cachinnans. Female is Herring Gull argenteus.
  • In 2022: both female and male are Caspian Gull cachinnans.
  • In 2022: both female and male are Caspian Gull cachinnans.
  • In 2023: no clue on parents, likely same birds. Poorly monitored this season.
location May 28th, 2021: argentatus x cachinnans pulli. April 15th, 2022: nest location April 15th, 2022: nest location
 
  April 15th, 2022: nest location April 19th, 2022: female and male cachinnans. April 19th, 2022: female and male cachinnans.
 
partner 1 May 28th, 2021: sub-adult male cachinnans. April 16th, 2021: sub-adult male cachinnans. May 6th, 2021: partners at nest.
 
female 2022: May 17th, 2022: female cachinnans. May 17th, 2022: female cachinnans. April 27th, 2022: female cachinnans.
 
male 2022: April 27th, 2022: male cachinnans. April 27th, 2022: male cachinnans. May 4th, 2022: male cachinnans.
 
pullus 2022: May 17th, 2022: pullus r[5.L]. May 17th, 2022: pullus r[5.M]. June 21st, 2022: 3rd chick, unringed.
 

Visits and data.

date:              
06-05-2021 Still no visits this season, due to presence of many Spoonbills.
   
13-05-2021 No visit. Camilla is trapping a Spoonbill at dam 1.
   
15-05-2021 Still no visits this season, due to presence of many Spoonbills.
   
28-05-2021 The only real visit this season: 2 pulli in nest.
  metal ring plastic: head+bill:  
pullus .5559420 b-F|6 64,2 F1 hybride argentatus x cachinnans
pullus .5559421 b-F|7 66,6 F1 hybride argentatus x cachinnans
   
08-06-2021 Herring Gull at this location and several alarming Caspian Gulls in the air, probably including partner.

Visits and data 2022 for nest 40:
Estimation egg laying: A-egg = April 12 2022. Estimating hatching = May 10 2022.

    length (mm) width (mm) volume (cm3):  water test on April 15th:     
15-04-2022 A egg 69,9 49 -- --    
  B egg 69 49,6 -- --    
               
19-04-2022 Sub-adult cachinnans n-F|6 is curious and lands on blocks near nest. Fiercy chased away by huge male cachinnans from nest 40. Female is also Caspian.
               
    length (mm) width (mm) volume (cm3):  water test on April 27th:     
27-04-2022 A egg     -- 3 mm - floating    
  B egg     -- 3 mm - floating    
  C egg 67,2 49,5 -- 3 mm - floating    
   
04-05-2022 From distance: male cachinnans circles over nest and lands on lighthouse as lookout post.
   
17-05-2022 From distance: female cachinnans circles over nest few times.
    metal darvic mass      
  pullus NLA 5625110 r-5M 200      
  pullus NLA 5625111 r-5L 136      
   
17-06-2022 From distance: both cachinnans parents near nest, with 3 chicks. Of course, one is unringed..
  r-5M and r-5L can fly around, pretty well.
   
21-06-2022 r-5M and r-5L and their unringed sibling fly around and swim on west side of nest, near yellow buoy. 3 Chicks fledged.
   
28-06-2022 male cachinnans near nest.
 
 
 
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 40-2023 69,5 50 87,48 68,6 50,3 87,39 65,2 48,7 77,86 252,73 same as 2022
 
40-2023
dam: dam 1 T split
location: S of Elder bush (Vliertje), 15 m south of tower. Same as 40-2021/2022.
breeders: cach x cach
OBSERVATIONS:
26-4-2023 adult: Unringed cach present at location, guarding at block on E-side.
nest: Exact same spot as 2022.
eggs: 3x egg, measured. No water test.
27-5-2023 nest: Nest empty, no chicks found.
Very poor monitoring this season, partly due to many Spoonbills & Little Egrets in this section. No clue on hatched or fledged chicks 2023.