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

Herring Gull argenteus F2-backcross S|X 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong.

Mother is Yellow-legged Gull michahellis hybrid ny-MT which is HY=2013 pullus from Wijk bij Duurstede colony, offspring from Herring x Yellow-legged Gull.
Male of nest 054 is Herring Gull. Offspring from nest 054 will be "Herring Gull backcross F2-hybrids".

Visits and data.

date:              
30-3-2021 ZY-MT patrolling near nest 054. Controlling air by chasing other birds.
16-4-2021 Nest checked. No eggs.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 24th: laying date:  
24-4-2021 A 50,5 71,1 91,30 20 - tip bottom    
24-4-2021 B 49,8 67,2 83,91 30 - tip bottom  
24-4-2021 C 48,4 63,3 74,66 20 - tip bottom  
sum nest: 249,87
26-4-2021 Both parters on look-out near nest. Herring Gull not ringed.
13-5-2021 Idem.  
15-5-2021 Nest complete, 3 eggs.  
    metal ring darvic ring mass  
28-5-2021 pullus .5559378 b-S|X 109 age: 2 / 3 days old  
28-5-2021 pullus .5559379 b-S|Y 133    
28-5-2021 pullus .5559380 59 too small for darvic ring  
8-6-2021 both parters on look-out near nest.  
metal ring darvic ring mass head + bill wing  
26-6-2021 pullus .5559379 b-S|Y 676 104,2 293 Pullus controlled.
26-6-2021 pullus .5550682 r-F.H 734 98,3 225 Likely a chick hatched from a neighbouring nest next to 054.
26-6-2021             Large juvenile flies off to water. Maybe b[S|X]???