Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Cachinnans - nest Lelystad 112
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 112 positioned on dam 1, just east of bend, 25 mtr west of PNED.
- ID certain in 2022: parents are male Caspian Gull type (short tongue on P10 may indicate hybrid, otherwise nice cachinnans) and female Caspian Gull.
- ID certain in 2023: male Caspian Gull same as 2022, female is Caspian Gull thayeri (formerly nest 29-2020, 29-2021, 135-2022).
- ID certain in 2024: male Caspian Gull same as 2022, female is Caspian Gull thayeri (formerly nest 29-2020, 29-2021, 135-2022).
| location | April 27th, 2022: nest location. | April 27th, 2022: 3 eggs. | April 26th, 2023: 3 eggs. |
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| April 12th, 2024: 1 egg. | April 21st, 2024: full clutch, with 3 eggs. | . | |
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| location | April 26th, 2023: 3 eggs. | . | . |
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| partner 1 | May 1st, 2022: partner 1 is cachinnans. | May 13th, 2023: female is cachinnans 'thayeri'. | May 13th, 2023: female is cachinnans 'thayeri'. |
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| partner 2 | April 27th, 2022: partner 2 is cachinnans type. | April 27th, 2022: partner 2 is cachinnans type. | May 4th, 2022: partner 2 is cachinnans type. |
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| partner 2 | April 26th, 2023: male cachinnans type. | May 13th, 2023: male cachinnans type with partner. | April 21st, 2024: male cachinnans type. |
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| partner 2 | April 21st, 2024: male cachinnans type. | April 21st, 2024: male cachinnans type. | . |
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| pullus | May 9th, 2022: pullus r[C.F]. | May 17th, 2022: pullus r[5.W]. | May 17th, 2022: pullus r[5.X]. |
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| pullus | July 18th, 2023: juvenile g[7|R]. | July 8th, 2023: juvenile g[7|S]. | October 10th, 2023: juvenile g[8|Z]. |
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Visits and data 2022 for nest 112:
Estimation egg laying: A-egg = April 3 2022. Estimating hatching = May 1 2022.
| date: | |||||||
| 12-04-2022 | adult near nest. | ||||||
| egg no: | width (mm): | length (mm): | volume (cm3): | ||||
| 15-04-2022 | A | 50,5 | 72,5 | -- | 50 - tip bottom | 3 eggs | |
| B | 48,3 | 64,9 | -- | 70 - tip bottom | |||
| C | 51 | 71,7 | -- | 90 - tip bottom | |||
| sum nest: | -- | ||||||
| egg no: | 3 eggs, 1 adult has short white tongue on P10: hybrid? | ||||||
| 29-04-2022 | A | float - 4 mm | |||||
| B | float - 4 mm | ||||||
| C | float - 5 mm | ||||||
| 01-05-2022 | Cach and hybrid type at nest. | ||||||
| 04-05-2022 | Cach at nest. | ||||||
| metal | darvic | mass | H+B | ||||
| 09-05-2022 | .5625057 | r-C.F | -- | -- | |||
| 17-05-2022 | .5625121 | r-5W | 515 | 85,9 | |||
| 17-05-2022 | .5625122 | r-5X | 618 | 94,9 | |||
| 17-06-2022 | No activity. | ||||||
| 21-06-2022 | No activity. | ||||||
| 28-06-2022 | r-CF 7 r-5W pictures. All chicks fledged: 3 out of 3. | ||||||
| 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 | 112-2023 | 74,6 | 51,7 | 100,40 | 74,2 | 51 | 97,17 | 71,2 | 50,2 | 90,34 | 287,91 | same as 2022 |
| ring pulli: May 09. | laying A egg: April 06. | hatch A egg: May 04. | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | ||||||
| Pullus | 18-5-2023 | 5556407 | G-7|R | 123 | 59,6 | |||||||
| Pullus | 18-5-2023 | 5556408 | G-7|S | 84 | 53 | |||||||
| Pullus | 27-5-2023 | 5.556.407 | g-7|R | 382 | ||||||||
| Pullus | 27-5-2023 | 5.625.270 | G-8|Z | 538 | ||||||||
| 112-2023 | |||||||
| dam: | dam 1 east | ||||||
| location: | Top of dam. On S-side: red/white traffic sign, nest 111 is just west of it. Same nest as 111-2022 | ||||||
| breeders: | cach x cach | ||||||
| OBSERVATIONS: | |||||||
| 09-4-2023 | adult: | Unringed cach present at location. So search for nest today. | |||||
| 26-4-2023 | adult: | Unringed cach present at location. | |||||
| nest: | Almost within Elder (vliertje), old red spot visible. Yellow/black flag in Elder. Top of dam, 25 m W of 19. | ||||||
| eggs: | 3x egg, measured. | A | 90 - tip bottom | ||||
| B | 90 - tip bottom | ||||||
| C | 80 - tip bottom | ||||||
| 11-5-2023 | eggs: | 3 eggs | |||||
| 13-5-2023 | adult: | female = cach thayeri. Male is Caspian too. | |||||
| 18-5-2023 | pulli: | 2 chicks ringed, 3rd not found | |||||
| 27-5-2023 | pulli: | 3rd chick ringed today, near waterfront at S-side. | |||||
| 18-6-2023 | pulli: | g-7|S at waterfront. | |||||
| 25-6-2023 | adult: | thayeri and all 3 chicks present, 3x fledged. | |||||
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: | |
| cach | cach | 71,2 | 52,4 | 98,43 | 73,8 | 52 | 100,48 | 73,8 | 52,6 | 102,81 | 301,72 | ||
| 112-2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 3 | 11-4-2024 | 7-5-2024 | |||||||||||
| dam: | dam 1 east | ||||||||||||
| location: | Near waterfront on south side. Red/white traffic sign, nest 112 is just east of it. | ||||||||||||
| parents? | same as 2023? | ||||||||||||
| ring pulli: | 11-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| OBSERVATIONS: | |||||||||||||
| 12-4-2024 | eggs: | 1 egg, measured. | |||||||||||
| 21-4-2024 | adult: | thayeri is one cach, male is cach-type (slightly broad medial band P10). | |||||||||||
| 21-4-2024 | eggs: | 3 eggs, not measured. | |||||||||||