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

Home

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 011

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 011 positioned below red-white beacon 59 at head of breakwater 2. One parent (male) uses beacon as look-out. Many Spoonbills in this section of the colony.
  • Certainty on ID in 2020, both parents are Caspian Gull cachinnans.
  • Certainty on ID in 2021, both parents are Caspian Gull cachinnans.
    Female probably different bird from last year, it has less black in wingtip ( maybe due to ageing, though difference is obvious). Male is the same bird.
location Nest location on April 15th, 2020. March 30th, 2021. .
   
eggs Eggs April 15th, 2020: 2 eggs clutch. Eggs April 16th, 2021: 3 eggs clutch. Eggs April 16th, 2021: 3 eggs clutch.
 
eggs Eggs May 15th, 2021. Eggs May 15th, 2021. Eggs May 15th, 2021.
 
partner 1 May 7th, 2020: female near nest. May 7th, 2020: female cachinnans. May 7th, 2020: female cachinnans.
 
partner 1 June 8th, 2021: female. June 8th, 2021: female. .
   
partner 2 May 7th, 2020: male cachinnans. May 7th, 2020: male cachinnans. May 7th, 2020: male cachinnans.
 
  March 30th, 2021. March 30th, 2021. March 30th, 2021.
 
pulli May 21st, 2020 pullus n[F|8]. May 21st, 2020 pullus n[F|9]. .
   

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
15-04-2020 A 51,5 70 93,48 50 - tip on bottom 3 eggs in nest.
  B 51,2 74,4 98,20 55 - tip on bottom
  C 51,2 75,2 99,26 85 - tip on bottom  
  sum nest: 290,93
07-05-2020 egg     Fully grown chick died inside the egg.
  pullus     Pullus 4 days old.
  pullus     Pullus 4 days old.
   
21-05-2020 pullus     Nest empty, but 2 chicks near nest and ringed. Pullus n[F|8].
  pullus     Nest empty, but 2 chicks near nest and ringed. Pullus n[F|9].
         
02-06-2020 --     No chicks present. Both parents present.
         
date:        
16-04-2021 A 51,9 73,7 99,95 50 - tip on bottom 3 eggs in nest.
  B 51 69,8 91,41 45 - tip on bottom
  C 52,9 73,4 103,42 85 - tip on bottom  
  sum nest: 294,79
         
26-04-2021 No visit. Camilla is trapping a Spoonbill.
         
15-05-2021 Many Spoonbill nests in this section, including an old empty nest close to flag 11. Have they hatched and do they already hide in vegetation?
  Camilla Dreef has placed flags for her Spoonbill nests in this section. Perhaps she has moved our flag a little?
  Also present: gull nest with 2 hatching eggs + 1 egg with small cracks. But is it the right cachinnans nest?
   
28-05-2021 Despite intensive search for ringing session, chicks not found in dense vegetation.
   
08-06-2021 Male present at his look-out: the tower. Female at blocks on northside of dam 2. No chicks visible.
   
26-06-2021 Despite intensive search for ringing session, chicks not found in dense vegetation. Nevertheless, constantly alarming parents overhead.