Reproduction of colonial hydroid Obelia geniculata (L., 1758) (Cnidaria: Hydrozoa) in the White Sea

Slobodov, S.A.; Marfenin, N.N.

Авторы: Slobodov S.A., Marfenin N.N.
Журнал: Hydrobiologia
Том: 530
Год издания: 2004
Издательство: Springer Nature
Местоположение издательства: Switzerland
Первая страница: 383
Последняя страница: 388
DOI: 10.1007/s10750-004-2682-4
Аннотация: Populations of the colonial hydroid Obelia geniculata in the White Sea reproduce asexually by frustule formation. Young medusae appear in the plankton during July and August. The number of medusae rarely exceeds 36 per m(3), and the average number varies every year from 0.4 to 10 per m(3). The size of medusae is smaller than reported from other regions. The umbrella of the largest recorded medusa was only 0.57 mm in diameter and the specimen had just 35 tentacles. Only a few mature medusae were found during the study. The colonies in the White Sea are epiphytic and grow only on laminarian thalli. At the beginning of July there are no colonies on thalli from the upper subtidal zone. By the end of August, colonies of O. geniculata had increased in density to 30 per M-2. Hydroid recruitment was attributed to active frustule production by colonies living below that zone. The frustules detach from the steins of the hydroids and are found in plankton. Production of frustules on branches occurs continuously during colony growth until water temperatures climb above 0 degreesC. We found that water temperature in this Arctic environment is generally too low for medusa maturation and planula development in the species. Propagation by frustule formation is the principal means of reproduction in Obelia geniculata within the White Sea. and this phenomenon accounts for the species being a dominant epiphyte on laminarian thalli there.
Добавил в систему: Марфенин Николай Николаевич

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Reproduction of colonial hydroid Obelia geniculata (L., 1758) (Cnidaria: Hydrozoa) in the White Seaстатья

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