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 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

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 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

Cachinnans - nest Lelystad 055

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 055 positioned high on artificial breakwater dam 2, nest between large blocks (labeled "nest with yellow jerrycan", neighbour of nest 54 ny-MT).
    Nest marked with yellow jerrycan rom flotsam and jetsam nearby nest.
  • ID in 2021 certain: all the time only one partner present, which is female Caspian Gull.
  • ID in 2022 certain: both parents are Caspian Gull.
  • ID in 2023 certain: both parents are same Caspian Gulls as in 2022.
  • ID in 2024 certain: both parents are same Caspian Gulls.
location April 12th, 2022: y[XCHP] on boulder of nest 55. April 27th, 2022: nest y[XCHP] and nest 55. Nest between blocks April 24, 2021 (with Albert de Jong).
 
location Eggs April 24th, 2021: 2 eggs clutch. April 15th, 2022: 3 eggs. April 26th, 2023: 3 eggs.
 
partner 1 April 24th, 2021: partner 1 = female cachinnans. April 24th, 2021: partner 1 = female cachinnans. April 24th, 2021: partner 1 = female cachinnans.
 
partner 1 April 29th, 2022: female cachinnans. April 29th, 2022: female cachinnans (different). May 4th, 2022: female cachinnans.
 
partner 1 May 4th, 2022: female cachinnans. May 11th, 2023: female cachinnans. May 11th, 2023: female cachinnans.
 
  April 23 2024: female cachinnans. April 23 2024: female cachinnans. April 23 2024: female cachinnans.
 
partner 2 April 29th, 2022: male is huge cachinnans. May 4th, 2022: male cachinnans. May 4th, 2022: male cachinnans.
 
partner 2 May 11th, 2023: male cachinnans. May 11th, 2023: male cachinnans. .
   
partner 2 April 23 2024: male is same as 2023. April 23 2024: male cachinnans. April 23 2024: male cachinnans.
 
pullus May 9th, 2022: 1x wet chick. May 30th, 2022: pullus r[6.S]. June 21st, 2022: r[6.S] & unringed juvenile.
 
pullus June 18th, 2023: pullus r[8.H]. May 11th, 2023: pullus r[8.W]. .
   

Visits and data.

date:              
16-4-2021 Nest is empty.    
  egg no: width (mm): length (mm): volume (cm3):  water test on April 24th: laying date:  
24-4-2021 A 48,1 71,5 83,29 45 - tip bottom    
24-4-2021 B 49,4 68,6 84,29 25 - tip bottom  
sum nest: 167,58
26-4-2021 Female Caspian Gull present.  
06-5-2021 Female Caspian Gull present. A-egg with scratches on one side.  
13-5-2021 Female Caspian Gull present. Which is the partner???  
15-5-2021 1 egg warm.  
15-5-2021 1 egg damaged next to nest.  
28-5-2021 1 egg rotten, nesting attempt for 2021 failed?  
26-6-2021 1 egg, 2nd brood is a new attempt.  

Visits and data 2022 for nest 136:
Estimation egg laying: A-egg = April 10 2022. Estimating hatching = May 8 2022.

date:              
11-04-2022 XCHP and partner Caspian Gull near nest. In retrospect: XCHP created a nest just below 55, nest 55 appeared to be for 2 other Caspians.  
     
12-04-2022 XCHP & partner below 55, on blocks (and that will be nest 221/XCHP for season 2022). Nest 55 for another pair, on top of dam with jerrycan.
  Partners are cachinnans. Wing pattern of male and female very similar! Often on top of dam on largest boulders.
               
  egg no: width (mm): length (mm): volume (cm3):  water test April 15th:    
15-04-2022 A-egg 50 72,3 -- 60 - tip bottom 3 eggs  
  B-egg 50 70,8 -- 30 - tip bottom  
C-egg 48,5 66,4 -- 10 - tip bottom
sum nest: --
15-04-2022 Male and female Caspian Gull at nest. Often using large boulders on top of dam as lookout.
Nest 55 is with the orange jerrycan, on top of dam.
Nest 55 is original nest 55-2022, XCHP breeding 8 mtr away, further down on south side of dam 2.
   
29-04-2022 2 adult Caspian Gulls near nest.
  egg no: width (mm): length (mm): volume (cm3):  water test April 15th:    
29-04-2022 A-egg -- -- -- 4 mm - floating 3 eggs  
  B-egg -- -- -- 3 mm - floating  
C-egg -- -- -- 4 mm - floating
   
04-05-2022 Male and female Caspian Gull at nest. Large boulders on top of dam are lookout. Female breeding.
Check pattern on innerweb (subterminal band) on P9 for differences between sexes, otherwise birds much alike.
   
09-05-2022 B-egg hatched this moring. 1x egg with small hole, 1x egg with scratches and fractions.
   
17-05-2022 Empty nest. Chicks hiding under boulders, not found.
   
22-05-2022 Empty nest. Chicks hiding under boulders, not found.
   
  metal darvic mass wing Head+Bill Bill  
30-05-2022 .5625168 r-6.S 817 175 100,3 40,3  
               
02-06-2022 2 adult Caspian Gulls near nest on lookout posts.
               
17-06-2022 2 adult Caspian Gulls near nest on lookout posts.  
  2 chicks present, no view on the legs to check for rings.  
         
21-06-2022 2 chicks present: one is r-6S, and one is unringed. Also 2x adults present.  
         
28-06-2022 2 chicks present: one is r-6S, and one is unringed. Also 2x adults present. Two fledged chicks from nest 55 in 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 55-2023 68,6 50,6 88,44 68,1 51,6 91,29 65,1 48,8 78,06 257,79 same as 2022
ring pulli: 12-mei laying A egg: 7-apr hatch A egg: 5-mei
     
catch: date: metal: darvic: mass: wing: head+bill:      
Pullus 11-05-2023 NLA 5556466 r 8.W -- -- --
Pullus 11-05-2023 NLA 5556467 r 8.H -- -- --
Pullus 27-05-2023 NLA 5556466 r-8.W -- -- -- dead, 2 days ago.
Pullus 27-05-2023 NLA 5556467 r 8.H 758 -- -- not full of energy.
Pullus 18-06-2023 NLA 5556467 r-8.H 586 268 108,6 Looks very slim.
   
55-2023  
dam: dam 2 east
location: next to large boulder which is lookout post, on top of dam, close to yXCHP & yzMT
breeders: cach x cach
OBSERVATIONS:
04-04-2023 adult: 2 adult cach on lookout stone. 
09-04-2023 adult: 2 adult cach on lookout stone. 
nest: 2 eggs measured. No watertest, ring chicks in 1st session.
26-04-2023 nest: 3 eggs, all measured.
27-04-2023 nest: 3 eggs.
adult: 2 adults present.
11-05-2023 pulli: 2 chicks ringed, is there a 3rd chick?
13-05-2023 adult: female & male photographed, exactly same as in 2022.
18-05-2023 nest: nest empyt, no chicks found
27-05-2023 pulli: 1x dead chick is r-8.W, 2 days ago; 1x chick measured, a bit down, low in energy.
18-06-2023 pulli: r-8H present, looks very slim and not healthy. Fledging rate: 1 chick.

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 cach 71 51 92,98 70,9 51,1 93,22 69,7 51,5 93,08 279,28
055-2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 10-4-2024 8-5-2024
   
dam: dam 2 east
location: next to large boulder which is lookout post, on top of dam, close to yXCHP.
parents? same as 2022, 2023
   
ring pulli: 12-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
                           
OBSERVATIONS:
12-4-2024 eggs: 2 eggs, measured. 
adults: Caspian Gulls present.
21-4-2024 eggs: 3 eggs, measured.