Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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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

Caspian Gull cachinnans F|J 1CY, May & August 2021, Lelystad & Almere, the Netherlands. Picture: Eric Roeland, Albert de Jong & Mars Muusse.

Blue bar tibia ring b[F|J], ringed as pullus Larus cachinnans on May 28 2021 at nest 38 in colony Lelystad, the Netherlands.
ID uncertain, one adult, the male, is Caspian Gull cachinnans. Female has some argenteus influences, generally considered 'a river gull' by us, a label for those birds that don't tick all the boxes.

below: Caspian Gull cachinnans F|J 1CY, August 29 2021, Lelystad, the Netherlands. Picture: Eric Roeland.

Perfect cachinnans.

below: Caspian Gull cachinnans F|J 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong & Mars Muusse.

With b-F|K from the same nest, nest 38.

Data:

date:              
21-05-2020 Two pulli found, ringed b[F|G] & b[F|H]. Food: Round Goby, wrap of pork sausage. Both adults overhead alarming. Both unringed.
02-06-2020 Adult with at least one ringed pullus at location. We didn't manage to read the code.
               
16-4-2021 Nest checked. No eggs. Adult present: female cachinnans-type same as last year.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 24th: laying date:  
24-4-2021 A 51,9 74,0 100,36 40 - tip bottom    
24-4-2021 B 51,9 75,4 102,26 50 - tip bottom  
24-4-2021 C 51,1 71,8 94,40 30 - tip bottom  
sum nest: 297,02
06-5-2021 Female present. 3 eggs in tact.
13-5-2021 2 partners present. Male is brutal cachinnans.  
15-5-2021 1 egg in tact.  
15-5-2021 1 egg hatching.  
15-5-2021 1 hatched chick. Mass = 75 gr.  
    metal ring darvic ring mass head + bill  
28-5-2021 pullus .5559376 b-F|J 554 85,8 Thrown up prey from chick: worms and fish.
28-5-2021 pullus .5559377 b-F|K 546 83  
           
8-6-2021 No visit.  
metal ring darvic ring mass head + bill wing  
26-6-2021 pullus .5559377 b-F|K 1174 125,5 363 retrapped chick and controlled.