Larus cachinnans in the Netherlands

(last update: August 16, 2020)
Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Leon Kelder
Mars Muusse

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Project Info
Location Lelystad
Location De Kreupel
2019 Lelystad
2020 Lelystad
2021 Lelystad
Coded nests Lelystad
2020 De Kreupel
2021 De Kreupel
Coded nests De Kreupel
All ring codes 2020
All ring codes 2021

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

Cachinnans - nest Lelystad 013

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 013 positioned on top of breakwater 2. Behind nest 18, just and a few meters eastwards.
  • By May 2020, area also occupied by Little Egrets and Spoonbills, therefore no controls after May 1st.
  • In 2021, nest was added to control list quite late, 1st week of May.
  • Uncertainty on ID in 2020, one parent is Caspian Gull cachinnans type, or just within hybrid zone. Other parent not photographed.
  • Uncertainty on ID in 2021, one parent is probably same bird, again Caspian Gull cachinnans type or just within hybrid zone. Possible partner may be sub-adult Herring Gull type.
location Eggs April 15th, 2020: 1 egg clutch. Eggs April 27th, 2020: 3 eggs clutch.  
   
partner 1 May 7th, 2020. May 7th, 2020. May 7th, 2020.
 
partner 1 April 26th, 2021: possible bird for nest 13. May 6th, 2021. May 6th, 2021.
 
partner 2 May 28th, 2021: possible partner nest 13. May 28th, 2021: possible partner nest 13. May 28th, 2021: possible partner nest 13.
 
pullus May 28th, 2021: pullus b[F|R]. May 28th, 2021: pullus b[F|S]. May 28th, 2021.
 

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
15-04-2020 A 51,4 71,2 94,71 90 - tip on bottom 1 egg in nest.
           
27-04-2020 B 51,1 72,2 94,92 90 - tip on bottom Now 3 eggs in nest.
  C 49,8 68,5 85,54 60 - tip on bottom  
  sum nest: 275,17
21-05-2020 ?? Nest not checked as there are Spoonbills and Little Egrets breeding there too now.
   
   
date:    
26-04-2021 Adult bird landed on this location. First indication of occupied nest.
   
egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:
06-05-2021 A egg 76,1 50,0 95,79 4 mm - floating 3 eggs in nest.
B egg 76,9 48,2 89,95 4 mm - floating
C egg 73,8 48,7 88,13 1 mm - floating
   
15-05-2021 Nest missed in control.
     
28-05-2021 metal tibia mass head + bill possible parent: Herring Gull type sub-adult.
pullus .5559402 b-F|P 210 58,8
pullus .5559403 b-F|R 190 67,2
pullus .5559404 b-F|S 185 65,2
     
08-06-2021 No visit. Spoonbill breeding here.
     
26-06-2021 No visit.