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 061 tibia r[F.B]

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).
  • Location marked with code "61" on tarmac dam.
  • Nest 061 "r-F.B" on breakwater dam 1 south section, most western cachinnans nest. Easy to trap the adults here; female trapped in 2021 and ringed r-F.B.
  • ID certain in 2021, both breeders are Caspian Gull cachinnans. Male is aged "5CY", on pattern of primary coverts.
location April 24th, 2021: red spray "61". April 24th, 2021: red spray "61". April 26th, 2021: guarding male, breeding female.
 
  May 13th, 2021: female guarding, male in nest. . .
     
eggs April 24th, 2021: 2 eggs in nest. April 24th, 2021. May 13th, 2021: 3 eggs in nest.
 
partner 1 April 26th, 2021: male cachinnans 5CY. April 26th, 2021: male cachinnans 5CY. May 13th, 2021: male cachinnans.
 
partner 2 May 13th, 2021: female cachinnans. May 13th, 2021: female cachinnans. May 13th, 2021: female cachinnans.
 
  May 28th, 2021: Roland-Jan Buijs & Mars Muusse. May 28th, 2021: Roland-Jan Buijs & Albert de Jong. May 28th, 2021: female cachinnans r-F.B.
 
pullus May 28th, 2021: cachinnans pullus r[F.Y]. . .
     

Visits and data.

date:                
24-04-2021 2 partners present, both cachinnans. Nest allows trapping breeders, easily.
  2 eggs in nest.            
  egg no: width (mm) length (mm) volume (cm3):  water test on April 24th:       
  A egg 50,8 71,8 93,29 30 - tip bottom      
  B egg 49,7 70,4 87,56 25 - tip bottom      
  sum nest: --        
   
26-04-2021 Both partners present, one guarding, one breeding. A female cachinnans with hanging left leg in flight is most probably NOT the breeding female. Is another cachinnans breeding here as well?
   
13-05-2021 Both partners present. Male has 5CY markings. Now the right female photographed in flight.
  3 eggs in nest.
   
15-05-2021 3 eggs in nest.
   
28-05-2021 3 eggs in nest.
  Cage placed and one bird (female) trapped for ringing.
    metal tibia mass head + bill wing tarsus bill
  adult .5559427 r-F.B 1030 124 454 69,7 59,8
                 
08-06-2021 Both partners present. At least 2 chicks around.
                 
    metal tibia mass head + bill wing  
26-06-2021 pullus .5550695 r-F.Y 649 90,4 157 most likely cachinnans chick of nest 61.
  pullus .5550696 r-F.Z 1126 111,8 260 argentatus, near nest 61, from neighbouring nest.
  pullus .5550697 r-F.1 1036 108,6 269 argentatus, near nest 61, from neighbouring nest.
  pullus .5550698 r-F.2 879 98,4 230 argentatus, near nest 61, from neighbouring nest.