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
Cachinnans - nest Lelystad y-P:U60 (068)
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 068 positioned at breakwater 1, centre of large blocks east of T split. Parents has look-out with loads of shit.
- ID certain in 2021, both are Caspian Gull cachinnans, female is 4CY Caspian Gull y[P:U60], male is large bird.
- ID certain in 2022, same Caspian Gull cachinnans, female is 5CY Caspian Gull y[P:U60], male is large bird.
- ID certain in 2023, same Caspian Gull cachinnans, female is 6CY Caspian Gull y[P:U60], male is large bird.
- ID certain in 2024, same Caspian Gull cachinnans, female is 7CY Caspian Gull y[P:U60], male is large bird.
| location | March 24 2021: 2 partners at dam 1. | March 30 2021: 2 partners at Almere waste dump (17 km's distance from colony). |
April 19 2022: partner 2. |
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| June 18th, 2023: 2 partners and 3 large chicks. | June 25th, 2023: 2 partners and 3 large chicks. | April 27 2022: egg floating. | |
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| nest | April 15 2022: 3 eggs. | April 27 2022: 3 eggs. | April 09 2023: 3 eggs. |
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| April 21st, 2024: 3 eggs clutch. | April 21st, 2024: 3 eggs clutch. | . | |
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| partner 1 | March 24 2021: y-P:U60 female cachinnans. | May 15 2021: y-P:U60 female cachinnans. | June 08 2021: y-P:U60 female cachinnans. |
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| April 27 2022: y-P:U60 female cachinnans. | May 27 2022: y-P:U60 female cachinnans. | April 05 2023: y-P:U60 female cachinnans & partner. | |
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| partner 2 | April 27 2022: male cachinnans. | May 30 2022: male cachinnans. | May 30 2022: male cachinnans. |
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| April 21st, 2024: male cachinnans. | . | ||
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| pullus | June 21 2022: chick cachinnans r-5.R. | June 21 2022: chick cachinnans r-5.S. | June 21 2022: chick cachinnans r-5.T. |
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| pullus | cachinnans chick r-8.3 fledged 2023. | cachinnans chick r-8.5 fledged 2023. | cachinnans chick g-7|C fledged 2023. |
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| pullus | May 31 2024: chick cachinnans g-B|8. | May 31 2024: chick cachinnans g-B|9. | . |
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| prey | May 17 2022: Roach / Rudd. | May 17 2022: Perch. | . |
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Visits and data.
| date: | egg no: | width (mm) | length (mm) | volume (cm3): | water test on May 7th: | |
| 06-05-2021 | A | 50,1 | 73,3 | 91,34 | 90 - tip at bottom. | 2 eggs in the nest, one partner is y[P:u60] 4CY cachinnans. |
| B | 49,2 | 70,9 | 92,28 | 90 - floating halfway. | ||
| sum nest: | -- | |||||
| 13-05-2021 | No visit, Camilla is trapping a spoonbill. | |||||
| 15-05-2021 | 2 eggs, still complete. y[P:U60] and partner is large Caspian Gull male. | |||||
| 28-05-2021 | nest is empty. y[P:U60] and partner both alarming. Chicks not found between all those blocks. | |||||
| 08-06-2021 | No activity visible from south side. Later, from north side y[P:U60] flying around. | |||||
Data for nest y-PU60: |
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| 12-04-2022 | y-P:U60 present. Nest not excatly located yet, but close to place of previous season. | |||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 12th: | ||
| 15-04-2022 | A | 51,8 | 72,9 | -- | 40 - tip at bottom. | 3 eggs in the nest. |
| B | 51,3 | 71,6 | -- | 30 - tip at bottom. | Extrapolation: 1st egg laid on April 9th; 1st egg will hatch on May 7th. Ring: May 14th. | |
| C | 50,1 | 70,5 | -- | 20 - tip at bottom. | ||
| sum nest: | -- | |||||
| 27-04-2022 | A | 4 mm- floating. | 3 eggs in the nest. | |||
| B | 3 mm- floating. | |||||
| C | 2 mm- floating. | |||||
| 09-05-2022 | y-P:U60 present. | |||||
| metal | darvic | mass | ||||
| 17-05-2022 | .5625114 | r-5T | 293 | Much fish around nest, incl Roach / Rudd and Perch. | ||
| .5625115 | r-5S | 191 | ||||
| .5625116 | r-5R | 329 | ||||
| metal | darvic | mass | ||||
| 30-05-2022 | .5625116 | r-5R | 680 | y-P:U60 and partner are present, together with (at least) . | ||
| 02-06-2022 | 2 adults and 3 large chicks present. | |||||
| 17-06-2022 | 2 adults and (at least) 2 chicks present. | |||||
| 21-06-2022 | 2 adults and all 3 large chicks r-5R, r-5S & r-5T present. | |||||
| 28-06-2022 | 2 adults and all 3 large chicks r-5R, r-5S & r-5T present. | |||||
| 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 | PU60 | 76,6 | 51 | 100,32 | 69,2 | 50,3 | 88,15 | 72,1 | 51,3 | 95,54 | 284,01 | same as 2022 |
| ring pulli: 10-mei | laying A egg: 5-apr | hatch A egg: 3-mei | ||||||||||
| date: | metal: | darvic: | mass: | wing: | head+bill: | |||||||
| pullus | 11-05-2023 | NLA5556478 | r 8.3 | -- | -- | -- | ||||||
| pullus | 11-05-2023 | NLA5556479 | r 8.5 | -- | -- | -- | ||||||
| pullus | 18-05-2023 | 5556495 | G-7|C | 550 | -- | 89,8 | ||||||
| pullus | 27-05-2023 | 5556495 | G-7|C | 955 | -- | -- | ||||||
| dam: | dam 1 blocks | |
| location: | location is PU60-2022. Red spot on block near nest. | |
| breeders: | cach x cach | |
| OBSERVATIONS: | ||
| 09-04-2023 | adult: | female PU60 & adult male cach present. Red spot renewed. |
| nest: | 3 eggs measured. Watertest C-egg: 20 - tip bottom. | |
| 11-05-2023 | pulli: | 2 chicks ringed, is there a 3rd chick? |
| 13-05-2023 | adult: | PU60 & male cach present. |
| 18-05-2023 | pulli: | 1 chick ringed G-7|C, R-85 present. |
| 27-05-2023 | pulli: | 1x control chick G-7|C. |
| 18-06-2023 | pulli: | r-83, r-85, g7|C present, with 2 adults (incl PU60). Fledged: 3 juveniles. |
| 25-06-2023 | pulli: | family complete, 3x chicks 2x parents. Result 2023: 3x fledged juveniles. |
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: | |
| P:U60 2024 | cach | cach | 75 | 52,6 | 104,48 | 74,6 | 51,7 | 100,40 | 72 | 50,7 | 93,19 | 298,06 | |
| # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | |||||||
| 3 | 10-4-2024 | 6-5-2024 | |||||||||||
| dam: | dam 1 blocks | ||||||||||||
| location: | location is PU60-2022/2023. Red spot + P on block near nest. | ||||||||||||
| parents? | same as 2023 | ||||||||||||
| ring pulli: | 11-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| 14-05-2024 | g-B|8 | .5631193 | nest PU60 | PONT | 1CY | 282 | |||||||
| 14-05-2024 | g-B|9 | .5631194 | nest PU60 | PONT | 1CY | ||||||||
| 04-06-2024 | g-B|8 | .5631193 | nest PU60 | PONT | 1CY | 260 | 839 | 108,7 | |||||
| 04-06-2024 | g-B|9 | .5631194 | nest PU60 | PONT | 1CY | 179 | 514 | 95,7 | |||||
| OBSERVATIONS: | |||||||||||||
| 12-04-2024 | eggs: | 2 eggs, measured. | |||||||||||
| 21-04-2024 | eggs: | 3 eggs, measured | |||||||||||
| adult: | both parents present. PU60 (incubating) & unringed male (guarding). | ||||||||||||
| 23-04-2024 | adult: | both parents present. | |||||||||||
| 07-05-2024 | eggs: | 2 eggs hatching, 1 chick just out, not ringed. | |||||||||||
| 14-05-2024 | chicks: | 2x ringed, 3rd chick not found. | |||||||||||
| 31-05-2024 | chicks: | g-B|8, g-A|9 present. | |||||||||||
| 04-06-2024 | chicks: | g-B|8 & g-B|9 present. measured. | |||||||||||
| 18-06-2024 | chicks: | g-B|8 present. | |||||||||||
