|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Coordinators: Albert de Jong Leon Kelder Roland-Jan Buijs Thijs Horst Merijn Loeve Mars Muusse |
|
partner 1 | May 7th, 2020. | . | . |
![]() |
|||
partner 2 | May 7th, 2020. | May 7th, 2020. | May 7th, 2020. |
![]() |
![]() |
![]() |
|
pullus | May 21st, 2020: pullus b[F|C]. | ||
![]() |
|||
location 2021 | March 30th, 2021 multiple cachinnans guarding on blocks. | April 26th, 2021: Herring Gull (left) at new nest. | . |
![]() |
|||
nest 2021 | April 16th, 2021: 2 eggs clutch. | April 16th, 2021: new location, new 2 eggs clutch. | May 15th, 2021: 3 eggs clutch. |
![]() |
![]() |
![]() |
|
April 21st, 2024: 3 eggs. | . | . | |
![]() |
|||
partner 1 | April 26th, 2021: Herring Gull sub-adult. | April 26th, 2021: Herring Gull sub-adult. | April 26th, 2021: Herring Gull sub-adult. |
partner 2 | April 26th, 2021: Caspian Gull type? Bird in background. | April 24th, 2021: possible partner, but uncertain. | April 24th, 2021: possible partner, but uncertain. |
![]() |
![]() |
||
nest 2022/23/24 | April 29th, 2022: 3 eggs clutch. | April 15th, 2022: nest site. | April 19th, 2022: female at nest site, which is next to 223. |
![]() |
![]() |
||
location | April 23rd, 2024: male & female cachinnans. | . | . |
![]() |
|||
. | April 26th, 2022: 3 eggs clutch. | April 26th, 2023: nest site. | April 9th, 2023: female cachinnans & neighbour cachinnans from nest 223 or 252. |
![]() |
![]() |
![]() |
|
partner 1 | April 11th, 2022: female is cachinnans. | May 4th, 2022: female is cachinnans. | April 11th, 2022: female is cachinnans. |
![]() |
![]() |
||
April 27th, 2023: female cachinnans. | April 27th, 2023: female cachinnans. | April 27th, 2023: female cachinnans. | |
![]() |
![]() |
![]() |
|
April 23rd, 2024: female cachinnans. | April 23rd, 2024: female cachinnans. | '. | |
![]() |
![]() |
||
partner 2 | April 29th, 2022: male is michahellis-type. | April 29th, 2022: male is michahellis-type. | April 29th, 2022: male is michahellis-type. |
![]() |
![]() |
![]() |
|
April 27th, 2023: male is michahellis-type. | April 27th, 2023: male is michahellis-type. | April 23rd, 2024: male is michahellis-type. | |
![]() |
![]() |
![]() |
|
pullus | June 28th, 2021: pullus b[S|Z] Herring Gull type. | June 28th, 2021: pullus b[S|0] Caspian Gull type. | May 9th, 2022: pullus r[C.X]. |
![]() |
![]() |
![]() |
|
pullus | May 14 2024: pullus g-B|1. | . | . |
![]() |
|||
Visits and data.
date: | ||||||
egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 15th: | ||
15-04-2020 | A | 53,3 | 73,1 | 104,56 | 30 - tip on bottom | 3 eggs in the nest. |
B | 50,7 | 68,3 | 88,40 | 10 - on bottom | ||
C | 51,2 | 73,7 | 97,28 | 40 - tip on bottom | ||
sum nest: | 290,23 | |||||
21-05-2020 | pullus | Empty nest. One pullus found, ringed b[F|C]. | ||||
date: | ||||||
16-04-2021 | 2 eggs. | Behind block code "17". Red flag placed near nest. | ||||
egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 16th: | ||
A | 53,5 | 71,5 | 103,04 | 20 - flat on bottom | ||
B | 52,3 | 68,9 | 94,89 | 25 - flat on bottom | ||
24-04-2021 | Nest 17 at flag disappeared? Herring Gull sub-adult started new nest 17 1 meter to the west, it has again 2 eggs. | |||||
2 eggs. | Behind bundle of braches and twigs. Flag replaced to this nest. And bundle sprayed red with paint. | |||||
egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 24th: | ||
A | 50,9 | 69,3 | 90,4 | 20 - flat on bottom | ||
B | 50,9 | 70,6 | 92,1 |
20 - flat on bottom | ||
26-04-2021 | Herring Gull at new nest 17, at look-out stone 40 cm from nest. Two yellow-legged birds again 6 mtr to the right forming a new pair, will be nest 41. | |||||
On blocks, 10 meter below nest 17 at waterfront, always a guarding Caspian Gull type (not pure). This will later be nest 45. | ||||||
13-05-2021 | On blocks, 10 meter below nest 17 at waterfront, again alert Caspian Gull type. | |||||
15-05-2021 | Nest 17 and nerst 41 split now definitely. Nest 17 with Herring Gull sub-adult and 3 eggs. | |||||
egg no: | width (mm) | length (mm) | volume (cm3): | water test on May 15th: No | Measurements Monika Ballmann. | |
A | 50,5 | 69,2 | 88,86 | -- | ||
B | 50,6 | 70 | 90,24 |
-- | ||
C | 49,5 | 68,9 | 85 | -- | ||
28-05-2021 | metal ring: | tibia ring: | mass (gr): | head + bill: | ||
pullus | .5559382 | b-S|Z | 123 | 56,5 | ||
pullus | .5559383 | b-S|0 | 243 | 64,5 | ||
pullus | .5559384 | b-S|1 | 198 | 63,6 | ||
08-06-2021 | Herring Gull sub-adult at nest. | |||||
On blocks, below nest 17 at waterfront, now 2 Caspian Gull type birds. The guarding Caspian Gull type will now be assigned nest 45, no longer potentially linked to nest 17. | ||||||
26-06-2021 | metal ring: | tibia ring: | mass | head + bill | wing | |
pullus | .5559382 | b-S|Z | 1039 | 113,3 | 287 | |
pullus | .5559383 | b-S|0 | 947 | 111,3 | 305 | |
Visits and data 2022: Estimation egg laying: A-egg = April 06 2022?. Estimating hatching = May 04 2022. |
||||||
11-04-2022 | adult bird present. This is location nest 17-2021. | |||||
15-04-2022 | A egg | 77,8 | 50,2 | No water test. | ||
B egg | 77,3 | 49,9 | ||||
C egg | 70,9 | 48,5 | ||||
Coded flag placed near nest. And red spot sprayed on stone near nest. | ||||||
19-04-2022 | adult bird present, same as April 11th. Neighbour is Herring Gull and behind 17 (on north side) is nest with y-X540. | |||||
29-04-2022 | A egg | float - 3 mm | ||||
B egg | float - 2 mm | |||||
C egg | float - 4 mm | |||||
Partner near nest seems to be a michahellis hybrid (River Gull), which moved from 17 to nest 41 in season 2021. | ||||||
04-05-2022 | both adults: cachinnans female and michahellis (-type) male. | |||||
09-05-2022 | A egg | infertile | ||||
pullus | NLA 5625073 | r-C.X | ||||
C egg | infertile | |||||
30-05-2022 | both adults present: cachinnans female and michahellis (-type) male. Chick hides in vegetation. | |||||
17-06-2022 | ringed juvenile at nest site, together with chicks from nest 223 (yX540).. | |||||
28-06-2022 | both adults 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 micha | 17-2023 | 72,0 | 52,0 | 98,03 | 71,8 | 52,5 | 99,64 | 68,9 | 51,3 | 91,30 | 288,96 | same as 2022 |
ring pulli: | laying A egg: | hatch A egg | ||||||||||
16-mei | 11-apr | 9-mei | (guess) |
17-2023 | ||
dam: | dam 2 central | |
location: | on S-side "17" coded on block. Same as 2022. | |
breeders: | cachinnans female and michahellis (-type) male. | |
OBSERVATIONS: | ||
09-04-2023 | nest: | empty, but nest is ready. |
26-04-2023 | nest: | 3 eggs measured, no water test. |
27-04-2023 | adult: | 2x cach type, slightly broad medial bands on P10. One bird probably from nest 2,5 mtr N (nest 223). |
11-05-2023 | nest: | 1 egg, where are the 2 eggs/chicks? |
13-05-2023 | adult: | pair present. |
18-05-2023 | nest: | nest empty, no chicks found. |
27-05-2023 | nest: | 2 eggs, 2nd attempt. |
25-06-2023 | nest: | 1 parent present, 4-days old chick in nest. Will be no ringing for this nest this year. |
15-07-2023 | nest: | large juvenile present. |
18-07-2023 | nest: | large juvenile present. |
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: | |
73,1 | 51,4 | 97,24 | 68,6 | 50,2 | 87,04 | 71,7 | 52,2 | 98,37 | 282,65 | ||||
017-2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
3 | 14-4-2024 | 12-5-2024 | |||||||||||
dam: | dam 2 central | ||||||||||||
location: | 17-2021/2022/2023 | ||||||||||||
parents? | Same? | ||||||||||||
ring pulli: | 18-May | ||||||||||||
date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
14-05-2024 | g-B|1 | .5631179 | nest 17 | PONT | 1CY | 188 | |||||||
OBSERVATIONS: | |||||||||||||
21-04-2024 | eggs: | 3 eggs, measured. | |||||||||||
07-05-2024 | nest: | 3 eggs, hatching. | |||||||||||
14-05-2024 | nest: | 1 egg, hatching today. | |||||||||||
chicks: | 1x ringed and measured. | ||||||||||||
04-06-2024 | pullus | g-B|1 dead, <1 day. Rings removed. | |||||||||||