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Coordinator: Albert de Jong Merijn Loeve Roland-Jan Buijs Leon Kelder Mars Muusse |
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location | Nest near tree April 24th, 2021. | Eggs April 24th, 2021: 3 eggs clutch. | . |
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partner 1 | June 2nd, 2020: hybrid-type. | June 2nd, 2020: hybrid-type. | June 2nd, 2020: hybrid-type. |
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partner 1 | April 24th, 2021: hybrid-type. | April 24th, 2021: partnerts. | . |
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partner 2 | May 21st, 2020: cachinnans. | April 24th, 2021: cachinnans. | May 13th, 2021: cachinnans. |
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pullus | May 21st, 2020: pullus b[F|G]. | May 21st, 2020: pullus b[F|H]. | Food: Round Goby. |
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pullus | May 15st, 2021: pullus hatched A-chick. | May 28th, 2021: b[F|J] and b[F|K]. | June 26th, 2021: b[F|K]. |
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Visits and data.
date: | |||||||
21-05-2020 | Two pulli found, ringed b[F|G] & b[F|H]. Food: Round Goby, wrap of pork sausage. Both adults overhead alarming. Both unringed. | ||||||
02-06-2020 | Adult with at least one ringed pullus at location. We didn't manage to read the code. | ||||||
16-4-2021 | Nest checked. No eggs. Adult present: female cachinnans-type same as last year. | ||||||
egg no: | width (mm): | length (mm): | volume (cm3): | water test on April 24th: | laying date: | ||
24-4-2021 | A | 51,9 | 74,0 | 100,36 | 40 - tip bottom | ||
24-4-2021 | B | 51,9 | 75,4 | 102,26 | 50 - tip bottom | ||
24-4-2021 | C | 51,1 | 71,8 | 94,40 | 30 - tip bottom | ||
sum nest: | 297,02 | ||||||
06-5-2021 | Female present. 3 eggs in tact. | ||||||
13-5-2021 | 2 partners present. Male is brutal cachinnans. | ||||||
15-5-2021 | 1 egg in tact. | ||||||
15-5-2021 | 1 egg hatching. | ||||||
15-5-2021 | 1 hatched chick. Mass = 75 gr. | ||||||
metal ring | darvic ring | mass | head + bill | ||||
28-5-2021 | pullus | .5559376 | b-F|J | 554 | 85,8 | Thrown up prey from chick: worms and fish. | |
28-5-2021 | pullus | .5559377 | b-F|K | 546 | 83 | ||
8-6-2021 | No visit. | ||||||
metal ring | darvic ring | mass | head + bill | wing | |||
26-6-2021 | pullus | .5559377 | b-F|K | 1174 | 125,5 | 363 | retrapped chick and controlled. |