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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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 029

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 029 positioned at breakwater 1, near nest 3 and nest 30 (which is a LBBG nest, with large code on block).
  • ID 2020 certain, both Caspian Gull cachinnans. Female known as 'the thayeri'. ID in 2021: same adults.
  • 5 eggs, one Lesser Black-backed Gull very aggressive and close to nest. The 2nd partner responsible for the extra eggs??? In 2021 the LBBG of nest 30 present again too.
location April 27th, 2020: nest location. April 16th, 2021. .
   
eggs May 7th, 2020: 5 eggs clutch. April 16th, 2021: 1 egg present. April 24th, 2021: 3 eggs clutch.
 
partner 1 2020 female cachinnans with thayeri. 2020 female cachinnans with thayeri. April 16th, 2021 female cachinnans with thayeri.
 
  April 16th, 2021 female cachinnans with thayeri.    
     
partner 2 May 7th, 2020: male cachinnans with yellow legs. May 7th, 2020: male cachinnans, always fighting the LBBG. .
   
  April 26th, 2021: male cachinnans with yellow legs. April 26th, 2021: male cachinnans with yellow legs. .
   
pullus May 21st, 2020: pullus n[F|U]. September 11st, 2020: exit pullus n[F|U]. .
   

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
07-05-2020 A 51,3 72,8 96,46 90 - floating, 7mm above surface 5 eggs in the nest, both partners cachinnans, with LBBG close by.
07-05-2020 B 51,9 71,8 97,38 90 - floating, 7mm above surface  
07-05-2020 C 46,3 65 70,16 90 - off bottom, halfway
07-05-2020 D 51,7 73,9 99,45 90 - floating, 5mm above surface
07-05-2020 E 50 65,3 82,20 90 - tip on bottom  
      sum nest: --    
21-05-2020 --     Egg A, B, C rotten but intact. One pullus, ringed n[F|U].
         
11-09-2020 --     Rotten egg in nest. Also in nest: tibia bone + ring of n[F|U].
         
date:        
  egg no: width (mm) length (mm) volume (cm3):  water test on April 16th:  
16-04-2021 A 51,7 73,1 96,46 00 - flat on bottom (just laid) 1 egg in nest
  1 adult ast nest. Again female cachinnans AKA the thayeri.
         
  egg no: width (mm) length (mm) volume (cm3):  water test on April 24th:  
24-04-2021 A 51,7 73,1 98,38 90 - tip on bottom  
  B 50,5 74,6 95,79 45 - tip on bottom  
  C 49,3 72,8 89,09 30 - tip on bottom  
      sum nest: 283,26    
         
24-04-2021 male cachinnans at nest.
         
13-05-2021 No visit, Camilla is trapping a Spoonbill.
         
15-05-2021 No visit, thunder rolling in.
         
28-05-2021 2 eggs in nest. Infertile?
         
08-06-2021 male guarding near nest, female 'the thayeri' at nest. Still trying to incubate?