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Coordinator: Albert de Jong Merijn Loeve Roland-Jan Buijs Leon Kelder Mars Muusse |
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partner 1 | May 7th, 2020. | . | . |
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partner 2 | May 7th, 2020. | May 7th, 2020. | May 7th, 2020. |
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pullus | May 21st, 2020: pullus b[F|C]. | ||
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location 2021 | March 30th, 2021 multiple cachinnans guarding on blocks. | April 26th, 2021: Herring Gull (left) at new nest. | . |
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nest 2021 | April 16th, 2021: 2 eggs clutch. | April 16th, 2021: new location, new 2 eggs clutch. | May 15th, 2021: 3 eggs clutch. |
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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. |
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pullus | June 28th, 2021: pullus b[S|Z] Herring Gull type. | June 28th, 2021: pullus b[S|0] Caspian Gull type. | . |
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nest 2022 | April 29th, 2022: 3 eggs clutch. | April 15th, 2022: nest site. | April 19th, 2022: female at nest site, which is next to 223. |
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partner 1 | April 11th, 2022: female is cachinnans. | May 4th, 2022: female is cachinnans. | April 11th, 2022: female is cachinnans. |
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partner 2 | April 29th, 2022: male is michahellis-type. | April 29th, 2022: male is michahellis-type. | |
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pullus 2022 | May 9th, 2022: pullkus r[C.X]. | . | . |
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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 |
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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 | |
date: | ||||||
15-04-2022 | A egg | 77,8 | 50,2 | |||
B egg | 77,3 | 49,9 | ||||
C egg | 70,9 | 48,5 | ||||
19-04-2022 | adult bird present, same as April 11th. Neighbour is Herring gull and behind 17 is nest with y-X540. | |||||
29-04-2022 | A egg | float - 3 mm | ||||
B egg | float - 2 mm | |||||
C egg | float - 4 mm | |||||
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 | |||||