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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Cachinnans - nest Lelystad n-F|+

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 n-F|+ positioned on dam 2: east at blocks, 15 mtr W of y-XCHP, low at dam 2.
  • ID certain in 2023: male is 4CY n-F|+ and partner is sub-adult female cachinnans.
  • ID certain in 2024: male is 5CY n-F|+ and partner is adult female cachinnans.
location April 27 2023: 3 eggs. April 27 2023: nest at dam 2. .
   
  April 21st, 2024: nest n-F|+ now at dam 1. April 21st, 2024: 3 eggs. April 21st, 2024: situation at cluster.
 
partner 1 April 09 2023: n-F|+. April 09 2023: n-F|+. March 26 2024: male n-F|+.
 
partner 1 March 26 2024: male n-F|+. April 30 2024: trapped male n-F|+. .
   
partner 2 May 13 2023: Caspian Gull. May 13 2023: Caspian Gull. May 13 2023: Caspian Gull.
 
chicks May 31 2024: chick g-C|2. May 31 2024: chick g-C|3. June 04 2024: fish bolus from g-C|2.
 

Visits and data:

egg sizes & volume 2023
SPECIES NEST A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST: known parents?
cach x cach n-F|+ 2023 69,3 46,6 75,77 67,4 47,1 75,28 67,3 47 74,85 225,91 new nest
ring pulli: May 18 laying A egg: April 13 hatch A egg: May 11
   
n-F|+ 2023 New nest
dam: dam 2 east, blacks
location: 20 mtr SW of nest 55, 15 mtr W of XCHP, low at dam 2. In front of wood. Red spot sprayed.
breeders: cach x cach
OBSERVATIONS:
27-04-2023 nest: 3 eggs measured. Water test. A: 90 - tip bottom
adult: breeding adult cachinnans is n[F|+]. B: 60 - tip bottom
30-04-2023 adult: partner is also cachinnans. C: 80 - tip bottom
n-F|+ at nest.
13-05-2023 adult: n-[F|+] & partner are immatures.
18-05-2023 nest: 1 egg hatching, no chicks found
27-05-2023 pulli: 1x chick dead in nest, age 1 day. No other chicks found. Several dead chicks in this section (55, XCHP, n-F|+).
25-06-2023 adult: not present, no birds here.

Visits and data 2024.

NEST code parent 1 parent  2 A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST:
n-F|+ 2024 cach cach 74,6 48,6 88,72 72,1 50 90,76 70,7 47 78,63 258,11
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 16-4-2024 14-5-2024
   
dam: dam 1 south
location: dam 1 south, near cluster nest 60, but 5 mtr S, at Blackberry edge.
parents? n-F|+-2023 was at dam 2. Now new breeder at dam 1.
   
ring pulli: 18-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
30-04-2024 n-F|+ .5552921 Dam 1 PONT M 5CY 464 1180 135 60,3 71 19,6 5
31-05-2024 g-C|2 .5631128 N-F|+ PONT 1CY              
31-05-2024 g-C|3 .5631129 N-F|+ PONT 1CY              
04-06-2024 g-C|2 .5631128 N-F|+ PONT 1CY 127   91,9        
04-06-2024 g-C|3 .5631129 N-F|+ PONT 1CY 220 809 108,7        
                           
OBSERVATIONS:
12-04-2024 eggs: no nest found.
21-04-2024 eggs: 3 eggs, measured.
nest: cluster again: 60, 69, PAM0, n-F|+, and 2 Herrings to follow soon.
30-04-2024 adults: trapped n-F|+.
02-05-2024 eggs: 3 eggs.
05-05-2024 nest: 3 eggs, not measured.
14-05-2024 nest: 2 eggs, no chick found in dense vegetation.
31-05-2024 chicks: 2x ringed.
04-06-2024 chick: g-C|2 & C|3 present. measured.
  food: fish bolus.