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 003

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 003 positioned high on artificial breakwater 1 between blocks, west of nest 001.
  • Certainty on ID in 2020, breeders are Caspian Gull cachinnans. In 2021: same birds.
location Nest in vegetation: 2020. April 26th, 2021: male cachinnans at nest. .
   
eggs April 15th, 2020: 1 egg clutch. April 27th, 2020: 3 eggs clutch. April 16th, 2021: nest cachinnans, marked code '3'.
 
partner 1 May 7th, 2020: male cachinnans. May 7th, 2020: male cachinnans. June 2nd, 2020: male cachinnans.
 
  April 26th, 2021: male cachinnans. April 26th, 2021: male cachinnans. April 26th, 2021: male cachinnans.
 
partner 2 May 7th, 2020. May 7th, 2020. .
   
  April 16th, 2021: female cachinnans. July 9th, 2021: female cachinnans.  
   
pulli May 21st, 2020 pullus n[F|R]. May 21st, 2020 pullus n[F|S]. May 21st, 2020 pullus n[F|T].
 
  May 28th, 2021 pullus r[F.D]. May 28th, 2021 pullus r[F.E]. July 9th, 2021: unringed chick & female cachinnans.
 

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th: laying date:  
15-04-2020 A 50,3 72,3 92,10 90 - floating, 4mm above surface    
             
27-04-2020 B 50,1 71,5 90,36 90 - hafway in water   Both parents have cachinnans wing pattern.
27-04-2020 C 47,9 70,3 81,21 90 - tip at bottom  
   
sum nest: 263,68  
21-05-2020 pulli Empty nest, 3 chicks near nest, ringed n[F|R], n[F|S], n[F|T].
     
     
date:    
16-04-2021 One adult is 100% certain partner 2 2020. Alert adult near nest.
  Nest with 3 eggs.
  egg no: width (mm) length (mm) volume (cm3):  water test on April 16th:  
  A egg 50,5 75,1 96,43 35 - tip at bottom  
  B egg 50,4 72,1 92,21 40 - tip at bottom  
  C egg 49,5 72,3 89,20 30 - tip at bottom  
      sum nest: 277,84  
         
24-04-2021 3 eggs present.
         
26-04-2021 Adult very reluctant to leave the nest.
         
06-05-2021 No visit.
   
13-05-2021 No visit, due to Spoonbills settling.
     
15-05-2021 No visit, due to thunder.  
         
28-05-2021   metal tibia mass (gr) head + bill (mm)  
  pullus .5559428 r-F.D 707 93,3  
  pullus .5559429 r-F.E 641 93  
         
08-06-2021 One guarding adult, near location where we ringed chicks.
         
26-06-2021 No visit, due to narrow timeframe.
   
09-07-2021 Female at blocks, right beneath nest 3, with fledged unringed juvenile.