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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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

Lelystad 2023:
nest y-PNED
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X60J
nest y-XCHP
nest w-327:U
nest n-F|6
nest n-F|8
nest n-F|+
nest n-F|N
nest r-6.B
nest r-7.P
nest r-C.G
nest w-8Z
nest 003
nest 006
nest 013
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 033
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 108
nest 109
nest 111
nest 112
nest 127Z
nest 131Z
nest 132 YLG
nest 135
nest 139
nest 147Z
nest 163
nest 167
nest 168
nest 204
nest 206
nest 207
nest 223
nest 227
nest 230Z
nest 231
nest 244Z
nest 245Z
nest 248
nest 251
nest 252
nest 253
nest 254
nest 255Z
nest 256Z
nest 262

Cachinnans - nest Lelystad 109 & 114

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 109 & 114 positioned on dam 1 at T split; 109 = 40 meters south of lighthouse, on westside dam, between blocks. Nest 114 = 25 meters south of lighthouse.
    Nest close to Spoonbill nests, therefore limited visits. Instead: observed from distance with binoculars or telescope.
  • ID certain in 2022 for 109: both parents are cachinnans.
  • ID certain in 2022 for 114: one parent is cachinnans, partner is Herring Gull argenteus. No eggs in 2022.
  • ID uncertain in 2023: one parent is cachinnans, partner is unknown.
location April 27th, 2022: 1 egg in nest 109. April 15th, 2022: location of nest. April 26th, 2023: location of nest.
 
location April 19th, 2022: locations of nest 109 & nest 114. April 19th, 2022: adult cachinnans for nest 109. April 19th, 2022: cachinnans.
 
partner 1 April 15th, 2022: 1 egg in nest 109. April 26th, 2023: 3 eggs in nest 109. .
   
partner 1 April 27th, 2022: cachinnans. April 27th, 2022: cachinnans. May 4th, 2022: cachinnans & argenteus.
 
partner 1 May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans. .
   
nest 114 May 4th, 2022: adult cachinnans for nest 114. . .
     
pullus May 18th, 2023: pullus r[8.N]. May 18th, 2023: pullus r[8.Z]. .
   

Visits and data 2022 for nest 109:
Estimation egg laying: A-egg = April 15 2022. Estimating hatching = May 13 2022.

date:              
12-04-2022 From distance: 2 birds at nest site. One guarding near waterfront, partner at the nest.
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A 50,5 69,5 -- --    
  A-egg is intense blue.
  Code 109 sprayed on blocks and wooden red T placed near nest as marker. Nest only visible from westside.
             
19-04-2022 From distance: 2 birds at nest site. One cachinnans guarding near waterfront, partner at the nest.
             
27-04-2022 Still only 1 egg.
   
17-05-2022 Empty nest. Not searched for chicks. We have to check from a distance if parents have a chick here.
   
17-06-2022 From distance: one parent present.
   
12-07-2022 From distance: one cachinnans on blocks in front of nest.

Visits and data 2022 for nest 114:
Estimation egg laying: there were never eggs in 2022.

date:              
19-04-2022 From distance: 2 birds at nest site. One cachinnans and one argenteus.
Nest location is from 2021, the red marking spot on the blocks is still visible. Between lighthouse and nest 109.
             
27-04-2022 Still no eggs.
   
04-05-2022 From distance: 2 birds at nest site. One cachinnans seems to be breeding, and one argenteus standing next to nest.
   
17-05-2022 Empty nest. Not searched for chicks. We have to check from a distance if parents have a chick here.
   
17-06-2022 No birds present.
   
12-07-2022 Adult cachinnans at block in front of 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 ? 109-2023 68,7 50,5 88,21 67,3 49,3 82,36 67 48,4 79,03 249,60 no, same as 2022?
ring pulli: laying A egg: hatch A egg
date?
catch: date: metal: darvic: mass: wing: head+bill:      
Pullus 18-5-2023 5556490 R-8N 170 59
Pullus 18-5-2023 5556491 R-8Z 156 59
 
109-2023
dam: dam 1 T-split
location: Nest "wooden T". Same as 109-2022. only visible from W. Below Spoonbills.
breeders: cach x ?
OBSERVATIONS:
26-04-2023 adult: not recorded. Fast visit because of Spoonbill nests with chicks.
eggs: 3x egg, measured. No water test (quick visit, due to Spoonbills). Eggs are very brown.
13-05-2023 adult: cach present.
18-05-2023 pulli: 2 chicks ringed, 3rd not found