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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Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

Cachinnans - nest Lelystad 109 & 114

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 109 & 114 positioned on dam 1 at T split; 109 = 40 meters south of lighthouse, on westside dam, between blocks. Nest 114 = 25 meters south of lighthouse.
    Nest close to Spoonbill nests, therefore limited visits. Instead: observed from distance with binoculars or telescope.
  • ID certain in 2022 for 109: both parents are cachinnans.
  • ID certain in 2022 for 114: one parent is cachinnans, partner is Herring Gull argenteus. No eggs in 2022.
location April 15th, 2022: location of nest. April 19th, 2022: locations of nest 109 & nest 114. April 15th, 2022: 1 egg in nest 109.
 
partner 1 April 19th, 2022: adult cachinnans for nest 109. April 19th, 2022: cachinnans. April 27th, 2022: 1 egg in nest 109.
 
  April 27th, 2022: cachinnans. April 27th, 2022: cachinnans. May 4th, 2022: cachinnans & argenteus.
 
nest 114 May 4th, 2022: adult cachinnans for nest 114.   .
     
prey      
       

Visits and data 2022 for nest 109:
Estimation egg laying: A-egg = April 15 2022. Estimating hatching = May 13 2022.

date:              
12-04-2022 From distance: 2 birds at nest site. One guarding near waterfront, partner at the nest.
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A 50,5 69,5 -- --    
  A-egg is intense blue.
  Code 109 sprayed on blocks and wooden red T placed near nest as marker. Nest only visible from westside.
             
19-04-2022 From distance: 2 birds at nest site. One cachinnans guarding near waterfront, partner at the nest.
             
27-04-2022 Still only 1 egg.
   
17-05-2022 Empty nest. Not searched for chicks. We have to check from a distance if parents have a chick here.
   
17-06-2022 From distance: one parent present.
   
12-07-2022 From distance: one cachinnans on blocks in front of nest.

Visits and data 2022 for nest 114:
Estimation egg laying: there were never eggs in 2022.

date:              
19-04-2022 From distance: 2 birds at nest site. One cachinnans and one argenteus.
Nest location is from 2021, the red marking spot on the blocks is still visible. Between lighthouse and nest 109.
             
27-04-2022 Still no eggs.
   
04-05-2022 From distance: 2 birds at nest site. One cachinnans seems to be breeding, and one argenteus standing next to nest.
   
17-05-2022 Empty nest. Not searched for chicks. We have to check from a distance if parents have a chick here.
   
17-06-2022 No birds present.
   
12-07-2022 Adult cachinnans at block in front of nest.