О размножении широконоски (Anas clypeata L.) на Горьковском водохранилище
Reproduction of Anas clypeata L. was studied in the Unzhensky stationar in 1960 and 1961. A prenesting period lasted for 11-14 days, nesting for about two months. Anas clypeata L. makes nests on meadows, islands and plavni near nests of other species of ducks and snipes. A total period of egg-layin...
Збережено в:
| Дата: | 1972 |
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| Автор: | |
| Формат: | Стаття |
| Мова: | Russian |
| Опубліковано: |
Інститут зоології ім. І.І. Шмальгаузена НАН України
1972
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| Назва видання: | Вестник зоологии |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/186933 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | О размножении широконоски (Anas clypeata L.) на Горьковском водохранилище / А.В. Молодовский // Вестник зоологии. — 1972. — Т. 6, № 3. — С. 55-61. — Бібліогр.: 5 назв. — рос. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | Reproduction of Anas clypeata L. was studied in the Unzhensky stationar in 1960 and
1961. A prenesting period lasted for 11-14 days, nesting for about two months. Anas clypeata L. makes nests on meadows, islands and plavni near nests of other species of ducks and snipes. A total period of egg-laying is 45--49 days. In complete ovipositions there are usually 5-13, more often 10 eggs. Incubation lasts for 22-23 days, hatching - for 22-49 days. Mass hatching takes place in the middle of June. Death loss of non-flying ducklings in broods accounts for 27.1-37%. The period of brood starting to fly takes 23_42 days. The greatest quantity of summer broods is observed in August. An average weight of hatched ducklings is 28.3 g; at the beginning of October maximum weight of four-month males is 600 g. |
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