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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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 227

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 227 positioned on old Spoonbill nest, between bushes at dam 2. East of blue sign VHF20, about 25 meters: nest with the "blue rope".
  • ID certain in 2022: both immature cachinnans, one is 4CY male and one is 5CY female.
  • ID certain in 2023: both are cachinnans, one is 5CY male.
location April 29th, 2022: nest with blue rope. April 29th, 2022: nest behind bushes. April 29th, 2022: 2 eggs, already floating.
 
location April 4th, 2023: 2 Caspian Gulls present at nest. April 9th, 2023: 2 Caspian Gulls present at nest. April 9th, 2022: 2 eggs already.
 
partner 1 April 29th, 2022: male 4CY cachinnans. April 29th, 2022: 4CY cachinnans. April 29th, 2022: 4CY cachinnans.
 
partner 1 April 27th, 2023: 5CY cachinnans. April 27th, 2023: 5CY cachinnans. April 27th, 2023: 5CY cachinnans.
 
partner 2 May 4th, 2022: female 5CY cachinnans. May 4th, 2022: 5CY cachinnans. May 4th, 2022: 5CY cachinnans.
 
pullus May 9th, 2022: pullus r[C.P]. November 29th, 2023: fledged r[C.P]. May 9th, 2022: pullus r-[C.R].
 

Visits and data.

date: egg no: width (mm): length (mm): volume (cm3):   
29-04-2022 A 48,2 69,3 -- float - 4 mm
  B 48,2 67,6 -- float - 4 mm
sum nest: --
4CY is breeding.  
   
04-05-2022 4CY at nest.
   
09-05-2022 Loads of fish in nest. Smelly.
2 pulli.
NLA 5625065 r-C.P
NLA 5625066 r-C.R Eventually, 2 chicks fledged in 2022.
 
egg sizes & volume 2023
SPECIES NEST A_length A_width A_volume B_length B_width B_volume TOTAL NEST: known parents?
cach x cach 227-2023 72,1 49,1 87,52 74 48 85,84 173,36 same as 2022?
ring pulli: May 10 laying A egg: April 5 hatch A egg May 3
   
227-2023 nest with blue rope
dam: dam 2 central
location: On Spoonbill nest, nest with blue rope, between trees. 25 mtr E of VHF20. Same nest as 2022, and likely nest 47-2021
breeders: cach x cach
OBSERVATIONS:
04-04-2023 adult: 2 cach at nest.
09-04-2023 nest: 2 eggs measured. No watertest.
26-04-2023 nest: 2 eggs, still. Water test: A 2 mm - floating
B 3 mm - floating
27-04-2023 adult: sub-adult cach breeding.
11-05-2023 nest: nest looks abandoned, do they have chicks?
13-05-2023 adult: parents present, pictures of partner 1.
18-05-2023 nest: nest empty, no chicks found
27-05-2023 nest: nest empty, no chicks found. Conclusion: nest failed in 2023.