The life cycle of symbiotic Zanclea sessilis (Hydrozoa: Zancleidae) colonies with polymorphic hydranths from the Bay of Biscay

Marine Biodiversity - Tập 46 - Trang 901-910 - 2016
Álvaro Altuna1
1INSUB, Donostia-San Sebastián, Spain

Tóm tắt

The life cycle of the anthoathecate hydroid Zanclea sessilis (Gosse, 1853) (Cnidaria: Hydrozoa: Zancleidae), symbiotic with colonies of the cheilostomate bryozoan Turbicellepora magnicostata (Barroso, 1919) (Bryozoa: Gymnolaemata), was investigated in the laboratory using material collected in the Basque Country (Spain, southeast of the Bay of Biscay), and its medusae were reared to maturity. The gastrozooids, dactylozooids and the newly released and adult medusae are described and depicted, including their cnidome. The feeding behaviour of the medusae in the cultures is described. The colonies have polymorphic hydranths, and gastrozooids and dactylozooids can be distinguished. The latter are described for the first time in this hydroid, and have been known in the genus Zanclea Gegenbaur, 1857 only in species from the Indo-Pacific. Dactylozooids were observed only once in colonies in the field, although they developed occasionally in colonies kept in aquaria on their original substrate. The interaction between the hydroid and the bryozoan is considered a facultative mutualistic cooperation, as both species can live without forming an association. This interaction is common in the study area, as, in some shallow water environments, up to 65 % of the colonies of T. magnicostata host Z. sessilis.

Tài liệu tham khảo

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