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Coordinators: Albert de Jong Leon Kelder Roland-Jan Buijs Thijs Horst Merijn Loeve Mars Muusse |
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location | Nest location on April 15th, 2020. | April 16th, 2021. | April 26th, 2021: female on block. |
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April 9th, 2023: location. | |||
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eggs | April 15th, 2020: 3 egg clutch. | April 15th, 2022: 3 egg clutch. | April 9th, 2023: first egg. |
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partner 1 | April 27th, 2020: cachinnans. | . | . |
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partner 1 | April 16th, 2021. | April 16th, 2021: P9 with thin band. | April 11th, 2022: male is cachinnans. |
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partner 1 | April 12th, 2022: male is cachinnans. | April 11th, 2022: male is cachinnans. | April 27th, 2022: male is cachinnans. |
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partner 1 | April 26 2024: Caspian Gull male. | April 26 2024: Caspian Gull male. | . |
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partner 2 | May 7th, 2020: cachinnans. | May 7th, 2020: cachinnans. | . |
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partner 2 | April 26th, 2021: female cachinnans. | April 26th, 2021: P9 with broad band. | April 26th, 2021: female cachinnans. |
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partner 2 | April 29th, 2022: female cachinnans. | April 29th, 2022: female cachinnans. | April 29th, 2022: female cachinnans. |
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April 27th, 2023: female cachinnans. | May 13th, 2023: female cachinnans. | ||
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partner 2 | April 26 2024: Caspian Gull female. | April 26 2024: Caspian Gull female. | April 26 2024: Caspian Gull female. |
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pullus | May 21st, 2020 pullus n[F|=]. | May 21st, 2020 pullus n[F|+]. | |
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pullus | June 8th, 2021: female with chick. | June 26th, 2021: pullus r[F.L] | . |
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June 26th, 2021: pullus r[F.M] | June 26th, 2021: pullus r[F.N] | . | |
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pullus | May 9th, 2022: pullus r[C.T]. | May 9th, 2022: pullus r[C.U]. | May 17th, 2022: pullus r[5.2]. |
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May 11th, 2023: pullus r[7.=]. | May 11th, 2023: pullus r[8.U]. | May 11th, 2023: pullus r[8.X]. | |
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Visits and data:
Estimation egg laying: A-egg = April 09 2022. Estimating hatching = May 07 2022.
datum: | egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 27th: | |
15-04-2020 | A | 50,5 | 76,9 | 98,74 | 35 - tip on bottom | 3 eggs in nest. |
B | 50,4 | 77,2 | 98,74 | 25 - tip on bottom | ||
C | 50,4 | 71,8 | 91,83 | 15 - tip on bottom | ||
sum nest: | 289,31 | |||||
27-04-2020 | Certainty about parents, cachinnans. | |||||
21-05-2020 | pullus | Nest empty, with fish. 2 chicks ringed. n[F|=]. | ||||
pullus | Nest empty, with fish. 2 chicks ringed. n[F|+]. | |||||
02-06-2020 | pulli | n[F|=] together with large juvenile, so nest with 3 juveniles fledged? | ||||
date: | ||||||
egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 27th: | ||
16-04-2021 | A egg | 52,2 | 73,9 | 101,39 | 40 - tip on bottom | 3 eggs. |
B egg | 51,2 | 73,7 | 97,28 | 40 - tip on bottom | ||
C egg | 50,2 | 68,7 | 87,17 | 30 - tip on bottom | ||
26-04-2021 | Partner 1 at blocks in front of nest. Seemingly same parents as last year. | |||||
15-05-2021 | 3 eggs. (in retrospect: we should have checked for presence of letters on the eggs. Was this the still the same brood as on April 26th?) | |||||
28-05-2021 | 2 eggs + 1 chick (1 day old). What has been the breeding period for these eggs??? Was there a rapid 2nd attempt in late April??? | |||||
Female at nest, but P10 slightly ackward for pure cachinnans? (probably wrong bird?) | ||||||
08-06-2021 | Male is cachinnans. | |||||
Female appears at blocks with one chick. | ||||||
metal | tibia | mass | head + bill | wing | ||
26-06-2021 | .5550684 | r-F.L | 859 | 111,7 | 264 | cachinnans |
.5550685 | r-F.M | 948 | 112,8 | 252 | cachinnans | |
.5550686 | r-F.N | 912 | 112,2 | 228 | cachinnans | |
date: | ||||||
11-04-2022 | adult near nest. | |||||
egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 27th: | ||
15-04-2022 | A egg | 51,7 | 70 | -- | 10 - tip on bottom | 3 eggs. |
B egg | 51,7 | 76,7 | -- | 30 - tip on bottom | ||
C egg | 51,7 | 72,1 | -- | 20 - tip on bottom | ||
19-04-2022 | guarding adult on block. | |||||
29-04-2022 | A egg | float - 1 mm | ||||
B egg | float - 2 mm | |||||
C egg | float - 1 mm | |||||
metal | tibia | mass | head + bill | wing | ||
09-05-2022 | 5625068 | r-C.T | cachinnans | |||
5625069 | r-C.U | cachinnans | ||||
1 egg, hatching soon (A-egg). | ||||||
metal | tibia | mass | head + bill | wing | ||
17-05-2022 | 5625069 | r-C.U | 363 | -- | cachinnans | |
5625136 | r-5.2 | 206 | 69,7 | cachinnans | ||
30-05-2022 | from the boat one ringed chick visible, not found back later between blocks. | |||||
17-06-2022 | two ringed chicks present, possibly 3rd as well, but not seen. | |||||
21-06-2022 | r-52 swimming, together with r-54 (from nest y-X56A). R-CU & r-CT not seen. | |||||
21-06-2022 | Later this day: now r-52 swimming in creche with another 3 juveniles, including r-CU. Not all legs visible, to check for rings. | |||||
17-07-2022 | r-52 photographed. | |||||
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 | 14-2023 | 73,9 | 50,7 | 95,64 | 75,8 | 51 | 99,27 | 68 | 50,2 | 86,28 | 281,19 | same as 2022 |
ring pulli: 14-mei | laying A egg: 9-apr | hatch A egg: 7-mei | ||||||||||
catch: | date: | metal: | darvic: | |||||||||
Pullus | 11-05-2023 | NLA5556459 | r-7.= | |||||||||
Pullus | 11-05-2023 | NLA5556460 | r-8.U | |||||||||
Pullus | 11-05-2023 | NLA5556461 | r-8.X |
14-2023 | |||||||
dam: | dam 2 central | ||||||
location: | "14" code strayed on stone. Is nest 14-2020/2022 | ||||||
breeders: | cach x cach | ||||||
OBSERVATIONS: | |||||||
09-04-2023 | nest: | 1 egg measured. No watertest. | |||||
26-04-2023 | nest: | 3 eggs measured, and water test | A: floating - 1 mm | ||||
adult: | alarming parent | B: floating - halfway | |||||
27-04-2023 | adult: | Male cach at nest. Female guarding | C: floating - 0 mm | ||||
11-05-2023 | pulli: | 3 chicks ringed | |||||
13-05-2023 | adult: | male dark eye, no black P4. Female pale eye, black on P4. | |||||
27-05-2023 | nest: | no alarming adults, no chicks found. Nest failed apparently. |
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: | |
014-2024 | |||||||||||||
. | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
dam: | dam 2 central, code on block. | ||||||||||||
location: | all in the open, obvious spot for years | ||||||||||||
parents? | Not settled yet. | ||||||||||||
ring pulli: | |||||||||||||
date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
OBSERVATIONS: | |||||||||||||
21-04-2024 | eggs: | nest empty. Location used by r-6L to rest. Sometimes adult cach present. | |||||||||||
26-04-2024 | adults: | 2x adult Caspian Gull at nest site. | |||||||||||
07-05-2024 | nest: | empty. | |||||||||||