|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Coordinator: Albert de Jong Merijn Loeve Roland-Jan Buijs Thijs Horst Leon Kelder Mars Muusse |
|
location | April 16th, 2021: partners near nest. | April 16th, 2021: partners near nest. | May 4th, 2022: Caspian male is breeding. |
![]() |
![]() |
![]() |
|
May 4th, 2022: nest markings is 141. | May 4th, 2022: nest markings. | April 9th, 2023: nest markings. | |
![]() |
![]() |
![]() |
|
eggs | April 27th, 2020: 3 eggs clutch. | April 16th, 2021: 2 eggs clutch. | May 4th, 2022: 3 eggs clutch. |
![]() |
![]() |
![]() |
|
April 9th, 2023: 3 eggs clutch, early nest. | April 9th, 2023: adult male Caspian Gull. | . | |
![]() |
![]() |
||
partner 1 | May 7th, 2020: cachinnans female. | May 7th, 2020: cachinnans female. | May 7th, 2020: cachinnans female. |
April 16th, 2021: cachinnans female. | April 16th, 2021: cachinnans female. | April 26th, 2021: cachinnans male. | |
![]() |
![]() |
![]() |
|
partner 1 | May 30th, 2022: female Herring Gull argenteus. | May 30th, 2022: female Herring Gull argenteus. | May 30th, 2022: female Herring Gull argenteus. |
2022: Herring | |||
June 21st, 2022: female Herring Gull argenteus. | June 21st, 2022: female Herring Gull argenteus. | June 21st, 2022: female Herring Gull argenteus. | |
2023: w-327:U | May 13th, 2023: w-327:U at the nest. | May 13th, 2023: w-327:U at the nest. | May 13th, 2023: w-327:U at the nest. |
![]() |
![]() |
![]() |
|
partner 2 | May 7th, 2020: cachinnans male. | May 7th, 2020: cachinnans male. | May 7th, 2020: cachinnans male. |
2021: cachinnans male. | May 4th, 2022: cachinnans male. | May 4th, 2022: cachinnans male. | |
![]() |
![]() |
![]() |
|
May 17th, 2022: cachinnans male. | May 17th, 2022: cachinnans male. | May 17th, 2022: cachinnans male. | |
May 13th, 2023: male Caspian Gull. | May 13th, 2023: male Caspian Gull. | May 13th, 2023: male Caspian Gull. | |
![]() |
![]() |
![]() |
|
pulli | May 21st, 2020: pullus n[F|V]. | May 21st, 2020: pullus n[F|W]. | September 26th, 2020: juvenile n[F|W]. |
![]() |
![]() |
![]() |
|
pulli | June 8th, 2021: 2 large unringed chicks. | June 21st, 2022: hybrid pulli nest 141-2022. | July 12th, 2022: hybrid pullus nest 141-2022. |
![]() |
![]() |
||
July 8th, 2023: juvenile g[7|L]. | May 18th, 2023: juvenile g[7|M]. | . | |
![]() |
![]() |
Visits and data.
date: | egg no: | width (mm) | length (mm) | volume (cm3): | water test: | |
07-05-2020 | A | 50,3 | 70,4 | 89,68 | floating - 7mm | 3 eggs in the nest. |
B | 50 | 77,8 | 97,93 | floating - 5mm | ||
C | 50,6 | 74,9 | 96,56 | floating - 6mm | ||
sum nest: | 284,17 | |||||
21-05-2020 | pulli | 1 egg intact, but embryo dead. Two chicks here, ringed n[F|V] & n[F|W]. | ||||
date: | ||||||
16-04-2021 | Both adults at the nest, with 2 eggs. One partner sneeks from the nest, other partner guarding at blocks. | |||||
egg no: | width (mm): | length (mm): | volume (cm3): | water test: | ||
A egg | 50,9 | 71,1 | 92,75 | 0 - flat on bottom | ||
B egg | 51,2 | 72,9 | 96,22 | 20 - flat on bottom | ||
26-04-2021 | Both adults at the nest. | |||||
06-05-2021 | Only C-egg measured. | |||||
egg no: | width (mm): | length (mm): | volume (cm3): | water test: | ||
A egg | 5 mm - floating | |||||
B egg | 7 mm - floating | |||||
C egg | 49,4 | 72,2 | 88,71 | 3 mm - floating | ||
sum nest: | 277,68 | |||||
13-05-2021 | No visit. Camilla is trapping a Spoonbill here. | |||||
15-05-2021 | No visit. | |||||
28-05-2021 | 1 old egg in nest (rotten). 2 chicks not found in dense vegetation. | |||||
08-06-2021 | Pictures of 2 large chicks. Attacking parents. | |||||
26-06-2021 | 2 large chicks fly away, to open water. | |||||
Visits and data 2022 for nest 35/141: Estimation egg laying: A-egg = April 30 2022. Estimating hatching = May 28 2022. |
||||||
04-05-2022 | Dam 1 north side, exact spot of nest 35. Temporarily coded 141 for this season 2022. Sprayed this on block. Location: the Herring fighting Caspians of 2020/2021. | |||||
Adult male Caspian is breeding. Is partner 2. Could be bird nest 35 previous years? | ||||||
04-05-2022 | 3 eggs. | |||||
egg no: | width (mm): | length (mm): | volume (cm3): | water test: | ||
A egg | 50,1 | 72,6 | -- | 15 - tip bottom | ||
B egg | 49,6 | 73,4 | -- | 15 - tip bottom | ||
C egg | 50,2 | 72,7 | -- | 15 - tip bottom | ||
17-05-2022 | Partner 2 = adult Caspian at nest site. | |||||
22-05-2022 | Partner 2 = adult Caspian at nest site. | |||||
30-05-2022 | Nest empty, no chicks found in Blackberry vegetation. Herring Gull near nest site = partner 1. | |||||
02-06-2022 | Partner 2 = adult Caspian attacks the boat. Should have chicks, he is defending. | |||||
17-06-2022 | Partner 2 = adult Caspian attacks the boat. Should have chicks, he is defending. | |||||
21-06-2022 | Partner 2 = adult Caspian attacks the boat. Should have chicks, he is defending. At spot 141 is an adult Herring Gull (partner 1) with 2 large chicks. Apparently a mixed pair here. | |||||
12-07-2022 | 1 large chick (hybrid) of the mixed pair present. No birds ringed at this nest this season (H5N1 restrictions), unfortunately. | |||||
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 teus or cach x cach (327U??) |
141-2023 | 75,1 | 53,3 | 107,42 | 73,8 | 51,5 | 98,55 | 71,9 | 50 | 90,50 | 296,48 | same male as 2022 |
ring pulli: May 10th. | laying A egg: Apr 5th. | hatch A egg: May 3rd. | ||||||||||
catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | ||||||
Pullus | 18-5-2023 | 5556403 | G-7|L | 475 | 92 | |||||||
Pullus | 18-5-2023 | 5556404 | G-7|M | 490 | 90 |
141-2023 (formerly 035) | |||
dam: | dam 1 east | ||
location: | on block at N-side, east of PNED. Code 141 on block. "the Caspian of nest 035 always fighting the Herring". | ||
breeders: | cach x teus or cach x cach (327U??) | ||
OBSERVATIONS: | |||
9-4-2023 | nest: | 3 eggs measured. No watertest, ring chicks in 1st session. | |
adult: | female is teus, male is huge aggressive cachinnans | ||
13-5-2023 | adult: | male = cach. Female = cach w-327:U? Unless there is a nest right beneath 035? | |
18-5-2023 | pulli: | 2 chicks ringed, 3rd not found | |
27-5-2023 | pulli: | dense vegetation, nothing found. | |
25-6-2023 | pulli: | g-7|L present, guarded by w-327:U, twice today. |