Larus cachinnans in the Netherlands

(last update: August 16, 2020)
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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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 063

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).
  • Location 5 meters west of marked with code "60" on tarmac dam.
  • Cluster of 5 nests within 10 meters range: 3x cachinnans and 2x argentatus, which are extremely difficult to monitor. Next to Angelica is nest 60, next to blackberries complex are nest 62 & nest 63.
  • ID uncertain in 2021, one bird is probably hybrid.
  • ID uncertain in 2022, one bird is probably sub-adult Herring Gull.
  • ID uncertain in 2023, no images of parents. Plumage of juveniles suggest one parent (but likely both) has to be Herring Gull.
location April 24th, 2021: cluster of nests. April 24th, 2021: next to red spray "60". April 24th, 2021: fight over nest 60-62-63.
 
location April 19th, 2022: 2 eggs. May 1st 2022: 2 eggs. May 1st 2022: partner 1 is argenteus.
 
eggs April 24th, 2021: 3 eggs in nest. May 13th, 2021: 3 eggs in nest. May 13th, 2021: Herring Gull nest in background.
 
partner 1 April 24th, 2021: Herring type sub-adult. May 13th, 2021: Herring type sub-adult. May 13th, 2021: Herring type sub-adult.
 
partner 1 May 1st 2022: partner 1 is argenteus. May 4th 2022: partner 1 is argenteus. .
   
pulli May 15th, 2021: hatching date. May 28th, 2021: "Herring type" pullus b-F|2. May 28th, 2021: "Herring" pullus b-F|4.
 
pullus May 17th, 2022: pullus r[5.B] & r[5.E]. May 30th, 2022: pullus r[5.E] is dead. May 30th, 2022: pullus r[5.B].
 
offspring September 5th, 2023: juvenile g[7|4]. July 8th, 2023: juvenile g[7|5]. June 25th, 2023: juvenile g[7|6].
 

Visits and data.

date:                
24-04-2021 Probably 2 partners present, but difficult to allocate birds to the nests. Nest allows trapping breeders.
  One partner is hybrid type sub-adult.
  3 eggs in nest.            
  egg no: width (mm) length (mm) volume (cm3):  water test on April 24th:       
  A egg 74,4 51,4 98,97 90 - tip on bottom      
  B egg 74,1 51,1 97,42 35 - tip on bottom      
  C egg 71,3 49,3 87,25 25 - tip on bottom  
  sum nest: 283,64        
   
26-04-2021 Pictures taken from canoe, of several birds flying around nests 60-62-63. How to monitor, telescope?
   
13-05-2021 Still 3 marked eggs in nest 63.
  Again sub-adult near nest, with Herring type wingtip.
   
15-05-2021 Fish at nest: Rounded Goby 3x. Chick 2 vomited Rounded Goby (pellet taken for analysis).
  egg hatching at 75%
  egg hatching at 33%
  egg still complete
                 
    metal tibia head + bill comments:
28-05-2021 pullus .5559412 b-F|0 92,3 Large pullus (16-18 days old), likely cachinnans from nest 60.
  pullus .5559413 b-F|1 95,3 Large pullus, likely cachinnans from nest 60.
  pullus .5559414 b-F|2 75,8 Possibly argentatus, not necessarily from neighbour's nest, b-F|3 broken.
  pullus .5559415 b-F|4 73,2 Possibly argentatus, not necessarily from neighbour's nest, b-F|3 broken.
  pullus .5559416 b-S|3 56,8 Likely argentatus, from neighbour's nest.
  pullus .5559417 b-S|4 57,2 Likely argentatus, from neighbour's nest.
               
08-06-2021 3 adult Caspian Gulls present. No chicks visible from canoe, not on south nor on north side from water. They probably hide in blackberries complex.

Visits and data 2022:
Estimation egg laying: A-egg = April 17 2022. Estimating hatching = May 14 2022.

date:              
15-04-2022 adult Herring Gull near empty nest.  
               
19-04-2022 adult Herring Gull near nest with 2 eggs.  
               
  egg no: width (mm): length (mm): volume (cm3):       
27-04-2022 A 51,4 71,7 -- 90 - tip bottom 2 eggs  
  B 51 70,6 -- 90 - tip bottom  
sum nest: --
   
01-05-2022 Herring Gull sub-adult (5CY) guarding at nest.
   
04-05-2022 still 2 eggs; 3rd egg not likely. 5CY Herring Gull = partner 1.
   
09-05-2022 2 eggs.
   
17-05-2022 2 chicks
  metal darvic mass H+B wing    
17-05-2022 .5625102 r-5.B 108 -- -- .
17-05-2022 .5625103 r-5.E 91 -- -- .
   
30-05-2022 2 chicks
  metal darvic mass H+B wing bill  
30-05-2022 .5625102 r-5.B 628 92,7 114 34,4
30-05-2022 .5625103 r-5.E 150 dead in nest
   
21-06-2022 .5625103 r-5.E dead in 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?
teus x ? 63-2023 73,7 51,3 97,66 72,5 52 98,71 70,1 50,5 90,01 286,37 same as 2022
ring pulli: May 22nd. laying A egg: April 17th. hatch A egg: May 15th.
 
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 18-05-2023 5556423 G-7|4 64 48
Pullus 18-05-2023 5556424 G-7|5 105 53
Pullus 18-05-2023 5556425 G-7|6 118 55
Pullus 18-06-2023 g-7|4 1137 263 115,8 HG type
Pullus 25-06-2023 G-7|4 1109 311 121,7
G-7|5 1039 326 124,1
G-7|6 896 325 114,3
 
63-2023
dam: dam 1 west
location: Is nest 63-2021/22. From cluster 60-62-63.
breeders: teus x ?
OBSERVATIONS:
09-04-2023 nest: no eggs, nest is ready.
22-04-2023 nest:  3 eggs, water test: bottom 40 degrees, bottom 30 degrees, bottom flat.
18-05-2023 pullus 3 chicks ringed
18-06-2023 pullus 1x control: g-7|4 is Herring type, 32 days old.
25-06-2023 pullus 3x chicks fledged