AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Clavelina dellavallei [WoRMS] | |
Authority | (Zirpolo, 1825) | |
Family | Clavelinidae | |
Order | Aplousobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Not entered Comments: NE Atlantic Ocean Mediterranean Sea |
Life form / Life stage (?) |
References (not structured): Tarjuelo, I., Posada, D., Crandall, K., Pascual, M., Turon, X. 2001. Cryptic species of Clavelina (Ascidiacea) in two different habitats: harbours and rocky littoral zones in the northwestern Mediterranean. Marine Biology, 139, pp. 455-462. |
Sociability / Life stage (?) |
References (not structured): Ho, J. S., Conradi, M., López-González, P. J. 1998. A new family of cyclopoid copepods (Fratiidae) symbiotic in the ascidian (Clavelina dellavallei) from Cádiz, Spain. Journal of Zoology, 246(1), pp. 39-48. Comments: C. dellavalleiis a colonial ascidian. Each zooid is up to 3 cm high. The test is transparent and covered by small white spots. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Asexual Sexual References: Tarjuelo, I., Posada, D., Crandall, K., Pascual, M., Turon, X. 2001. Cryptic species of Clavelina (Ascidiacea) in two different habitats: harbours and rocky littoral zones in the northwestern Mediterranean. Marine Biology, 139, pp. 455-462. Comments: Tunicates are hermaphrodites. They retain eggs internally until they hatch. Larvae swim freely in plankton before attaching to a rocky substrate to undergo metamorphosis, which lasts 2 to 3 days. |
Developmental trait (?) | Brooding Viviparous References: Tarjuelo, I., Posada, D., Crandall, K., Pascual, M., Turon, X. 2001. Cryptic species of Clavelina (Ascidiacea) in two different habitats: harbours and rocky littoral zones in the northwestern Mediterranean. Marine Biology, 139, pp. 455-462. |
Characteristic feeding method / Life stage (?) |
References (not structured): Ho, J. S., Conradi, M., López-González, P. J. 1998. A new family of cyclopoid copepods (Fratiidae) symbiotic in the ascidian (Clavelina dellavallei) from Cádiz, Spain. Journal of Zoology, 246(1), pp. 39-48. Comments: These tunicates filter water to feed on plankton. They ingest water and food through the entrance siphon and expel water and waste through the outlet siphon. |
Mobility / Life stage (?) |
Comments: Colonies are attached to rocks, sea-fans or seaweeds. |
Salinity tolerance range (?) | Venice system: 6. Polymixohaline [18-30psu] 7. Euhaline [30-40psu] |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers References: López-González, P. J., Megina, C., Conradi, M. 1999. Ascidioxynus ibericus n. sp.(Copepoda: Poecilostomatoida: Lichomolgidae), associated with the ascidian Clavelina dellavallei from the Strait of Gibraltar. Hydrobiologia, 400, pp. 205-210. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Tarjuelo, I., Posada, D., Crandall, K., Pascual, M., Turon, X. 2001. Cryptic species of Clavelina (Ascidiacea) in two different habitats: harbours and rocky littoral zones in the northwestern Mediterranean. Marine Biology, 139, pp. 455-462. Comments: They can accumulate significant amounts of copper and lead in their tissues, especially in harbors where they absorb components from anti-fouling paints on boat hulls. |
Known human health impact? | Not known Comments: Not available. |
Known economic impact? | Not known Comments: Not available. |
Known measurable environmental impact? | Known References: Tarjuelo, I., Posada, D., Crandall, K., Pascual, M., Turon, X. 2001. Cryptic species of Clavelina (Ascidiacea) in two different habitats: harbours and rocky littoral zones in the northwestern Mediterranean. Marine Biology, 139, pp. 455-462. Comments: They are also good indicators of water quality, due to their capability of concentrating a certain amount of toxic elements in their tissues, such as heavy metals and hydrocarbons. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF] Available at: https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf [Accessed 1 July 2024]. |
Association with vessel vectors (?) | Unknown References: Tarjuelo, I., Posada, D., Crandall, K., Pascual, M., Turon, X. 2001. Cryptic species of Clavelina (Ascidiacea) in two different habitats: harbours and rocky littoral zones in the northwestern Mediterranean. Marine Biology, 139, pp. 455-462. Comments: Possible via biofouling. |
Molecular information | Not available |
Created by | Aleksas Narščius, 2017-10-11 |
Last update by | Sandra Gečaitė, 2024-08-06 |