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

Home

Project Info
International trend
National trend
Site characteristics
Breeding biology
Fecundity
Food resources
Nonbreeding season
Breeding species
Hybrid scores
Ring codes
Future

Lelystad 2020:
nest 001
nest 002 yPNED
nest 003
nest 005 yPLDP
nest 006 yPESV
nest 008 gXLDT
nest 009
nest 011
nest 012
nest 013
nest 014
nest 015
nest 016
nest 017
nest 018
nest 021
nest 025
nest 027
nest 028
nest 029
nest 031
nest 032
nest 033
nest 034
nest 035
nest 036
nest 037
nest 038
nest 039
pair A
pair B

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

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 034

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 034 positioned at breakwater 1, called "branch-nest" (3 white stripes on dead branch), between y[PNED] and T-split. Two meters from nest 33.
  • In 2024: nest "rode flap": at blocks, just west of open tarmac, was 'nest with the branch 2022', now with red flag and black root-cloth.
  • ID in 2020 certain, male is Caspian Gull cachinnans, female is Herring Gull argenteus.
  • Same pair in 2021.
  • Same pair in 2022.
  • Same pair in 2023.
  • ID 2024: male and female are Caspian Gull cachinnans.
location May 7th, 2020: nest location - stripes on branch. March 23rd, 2021: nest location - stripes on branch. March 27th, 2022: nest location - stripes on branch, coded 130.
 
nest May 7th, 2020: 3 eggs. March 27th, 2022: 3 eggs. April 12th, 2024: 3 eggs clutch: "Roodflapje".
 
  April 21st, 2024: Caspian breeding at "Roodflapje". April 21st, 2024: 3 eggs clutch: "Roodflapje". .
   
partner 1 May 7th, 2020: female argenteus. May 7th, 2020: female argenteus x male cachinnans. March 23rd, 2021: female argenteus.
 
partner 2 May 7th, 2020: male cachinnans. May 7th, 2020: male cachinnans. March 23rd, 2021: male cachinnans.
 
  March 27th, 2022: male cachinnans. c March 27th, 2022: male cachinnans.
 
  April 26th, 2023: male cachinnans. April 23 2024: female at nest. April 23 2024: male guarding.
 
pullus May 21st, 2021: pullus b[F|8]. May 21st, 2021: pullus b[F|9]. May 21st, 2021: pullus b[F|+].
 
  May 30th, 2022: one dead chick in nest. May 30th, 2022: one chick ringed r-7.G. August 19th, 2022: Almere, r-7.G fledged.
 
  June 18 2024: chick g-A|0. May 7th, 2024: chick g-A|2. May 7th, 2024: one egg infertile.
 
food May 14 2024: Roach. June 04 2024: fish bolus by g-A|0. .
   

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on May 7th:  
07-05-2020 A 50,8 70,3 91,34 90 - tip at bottom. 3 eggs in the nest, one partner argenteus, one partner cachinnans.
  B 49,8 73,9 92,28 90 - tip at bottom.  
  C 47,3 76,3 85,95 90 - tip at bottom.
      sum nest: 269,57    
21-05-2020 eggs     Still 3 eggs present.
         
date:        
24-03-2021 2 adults at this location.
         
06-05-2021 2 adults guarding at blocks. Red flag "71" placed to mark location.
  egg no: width (mm) length (mm) volume (cm3):  water test on May 6th:  
  A 50,7 74,5 96,42 90 - tip at bottom.  
  B 50,3 70,3 89,56 90 - tip at bottom.  
  C 50,4 71,1 90,93 90 - tip at bottom.  
      sum nest: 276,91    
   
13-05-2021 no visit, Camilla is trapping a Spoonbill.
         
15-05-2021 nest with 3 eggs. Flag put up again, for it was not visible.
         
    metal ring plastic head + bill:    
28-5-2021 pullus .5559422 b-F|8 64    
  pullus .5559423 b-F|9 52    
  pullus .5559424 b-F|+ 62    
         
08-06-2021 1 adult at this location. All 3 chicks fledged. 100% success.

Visits and data 2022 for nest 34 (coded 130 on bitumen in 2022):
Estimation egg laying: A-egg = April 20 2022. Estimating hatching = May 18 2022.

    length (mm) width (mm) volume (cm3):  water test on April 27th:     
27-04-2022 A egg 70,9 48,3 -- 20 gr - tip bottom    
  B egg 73,6 50,3 -- 40 gr - tip bottom    
  C egg 73 49,2 -- 40 gr - tip bottom    
One parent is cachinnans (partner 1)  
   
17-05-2022 female Herring Gull argenteus next to nest.
  A egg: in tact.
  C egg: with small hole.
  B egg: hatched
   
    metal darvic mass wing H+B bill
30-05-2002 pullus NLA 5625188 r-7.G 454 80 79,9 33,2
One pullus dead in nest.
 
28-06-2022 image of r-7G. Together with female Herring gull and sibling (unringed).
 
12-07-2022 image of r-7G.
   
17-07-2022 image of r-7G.
 
34-2023
dam: dam 1 blocks
location: Western part of blocks. Nest is same as 34/130. Code 130 on bitumen, branch with 2 stripes.
breeders: cach x teus
OBSERVATIONS:
9-4-2023 nest: no eggs but nest is ready.
26-4-2023 eggs: 1 egg. Not measured, really cachinnans?
nest: Branch with 2 stripes is now rotten. Placed in front of nest, visible from N-side.
11-5-2023 eggs: 3 eggs, not measured. Is this the wrong nest?
27-5-2023 nest: The branch with 2 stripes taken away, and placed vertically at (new nest) 26. We will skip nest 34 this year.

Visits and data 2024.

NEST code parent 1 parent  2 A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST:
  cach   71,3 50,2 90,47 71,1 50,2 90,21 66,4 49,5 81,92 262,60
034-2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 8-4-2024 3-5-2024
   
dam: dam 1 blocks
location: Nest "rode flap": at blocks, just west of open tarmac, was 'nest with the branch 2022', now with red flag and black root-cloth.
parents? same as 2023?
   
ring pulli: 09-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
07-05-2024 g-A|0 .5631235 34 PONT 1CY 125          
07-05-2024 g-A|2 .5631236 34 PONT 1CY 84          
14-05-2024 g-A|0 .5631235 34 PONT 1CY 349   CONTROLL      
14-05-2024 g-A|2 .5631236 34 PONT 1CY 272   DEAD      
04-06-2024 g-A|0 .5631235 34 PONT 1CY 274 811 112,8 CONTROLL      
                           
OBSERVATIONS:
12-04-2024 eggs: 3 eggs, measured. 
21-04-2024 eggs: 3 eggs, not measured. 
adult: Caspian Gull incubating.
07-05-2024 eggs: 1x cold, probably infertile
chicks: 2x ringed.
14-05-2024 chicks: CONTROLL 2 chicks.
food: Roach 2x
31-05-2024 chick: g-A|2 dead <1 days.
04-06-2024 pullus g-A|2 dead. Rings removed.
  chicks: g-A|0 present, measured.
  food: fish bolus by g-A|0 when processed.
18-06-2024 chick: g-A|0 present.