AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Clavelina lepadiformis [WoRMS] | |
Authority | (Müller, 1776) | |
Family | Clavelinidae | |
Order | Aplousobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Not entered References (not structured): Reinhardt, J. F., Stefaniak, L. M., Hudson, D. M., Mangiafico, J., Gladych, R., Whitlatch, R. B. 2010. First record of the non-native light bulb tunicate Clavelina lepadiformis (Müller, 1776) in the northwest Atlantic. Aquatic Invasions, 5(2), pp. 185-190. Comments: Norway to the Adriatic |
Life form / Life stage (?) |
References (not structured): Berrill, N. J., Cohen, A. 1936. Regeneration in Clavelina lepadiformis. Journal of experimental biology, 13(3), pp. 352-362. |
Sociability / Life stage (?) |
References (not structured): Reinhardt, J. F., Stefaniak, L. M., Hudson, D. M., Mangiafico, J., Gladych, R., Whitlatch, R. B. 2010. First record of the non-native light bulb tunicate Clavelina lepadiformis (Müller, 1776) in the northwest Atlantic. Aquatic Invasions, 5(2), pp. 185-190. Comments: Colonial (or compound) tunicates consist of many zooids, bearing most or all of the organs of a solitary tunicate, but modified to varying degrees for colonial life. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Asexual Sexual References: Riley, K. 2008. Clavelina lepadiformis Light bulb sea squirt. In Tyler-Walters H. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 06-08-2024]. Available from: https://www.marlin.ac.uk/species/detail/1483 Comments: Colonial tunicates reproduce both asexually, by budding, and sexually, from fertilized eggs developing into larvae. Clavelina lepadiformis undergoes stolonic asexual budding. At the end of the sexual breeding season, towards the end of the summer, zooids disappear or are resorbed. Over the winter period the colony survives as 'winter buds' from which new zooids develop in spring. Each zooid reproduces sexually once, with the production of eggs possibly going on for weeks or months. Fertilization takes place internally, in the atrium, where development into the tadpole larvae stage also takes place. |
Developmental trait (?) | Brooding Viviparous References: Reinhardt, J. F., Stefaniak, L. M., Hudson, D. M., Mangiafico, J., Gladych, R., Whitlatch, R. B. 2010. First record of the non-native light bulb tunicate Clavelina lepadiformis (Müller, 1776) in the northwest Atlantic. Aquatic Invasions, 5(2), pp. 185-190. Comments: C. lepadiformis brood a large number of small undifferentiated larvae. After release, the larvae are free-swimming for about three hours. After this time the larvae settle on suitable substratum and metamorphosis into an adult sea squirt takes place. Development of the oozoid takes up to 3 days, and after 2-3 months of post-developmental growth they become sexually mature. |
Characteristic feeding method / Life stage (?) |
Comments: Water is pumped into the oral siphon, through finely meshed ciliated gills on the pharynx, where phytoplankton and detritus is filtered, and passed on mucus strings to the stomach and intestines. Excess waste is then expelled in the outgoing atrial water. |
Mobility / Life stage (?) |
References (not structured): Reinhardt, J. F., Stefaniak, L. M., Hudson, D. M., Mangiafico, J., Gladych, R., Whitlatch, R. B. 2010. First record of the non-native light bulb tunicate Clavelina lepadiformis (Müller, 1776) in the northwest Atlantic. Aquatic Invasions, 5(2), pp. 185-190. |
Salinity tolerance range (?) | Exact range: 14 - 40 References: Riley, K. 2008. Clavelina lepadiformis Light bulb sea squirt. In Tyler-Walters H. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 06-08-2024]. Available from: https://www.marlin.ac.uk/species/detail/1483 Comments: Tolerant of salinities as low as 14 psu. |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers References: Reinhardt, J. F., Stefaniak, L. M., Hudson, D. M., Mangiafico, J., Gladych, R., Whitlatch, R. B. 2010. First record of the non-native light bulb tunicate Clavelina lepadiformis (Müller, 1776) in the northwest Atlantic. Aquatic Invasions, 5(2), pp. 185-190. Comments: Colonies are reported to be limited to shallow littoral habitats (<50m) occupying natural or artificial hard substrates (e.g., rocky outcrops, wooden docks) and are known to dominate disturbed habitats. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: De Caralt, S., López-Legentil, S., Tarjuelo, I., Uriz, M. J., Turon, X. 2002. Contrasting biological traits of Clavelina lepadiformis (Ascidiacea) populations from inside and outside harbours in the western Mediterranean. Marine Ecology Progress Series, 244, pp. 125-137. |
Known human health impact? | Known References: Casertano, M., Genovese, M., Paoli, P., Santi, A., Aiello, A., Menna, M., Imperatore, C. 2022. Insights into Cytotoxic Behavior of Lepadins and Structure Elucidation of the New Alkaloid Lepadin L from the Mediterranean Ascidian Clavelina Lepadiformis. Marine drugs, 20(1), 65. Comments: Marine ascidians constitute an immense source of chemodiversity that can be beneficially exploited to discover new chemical entities for drug development. |
Known economic impact? | Known References: Reinhardt, J. F., Hudson, D. M. 2012. A review of the life history, invasion process, and potential management of Clavelina lepadiformis Müller, 1776: a recent invasion of the northwest Atlantic. Management of Biological Invasions, 3(1), 1. Comments: Tunicates have direct economic cost because they rapidly foul hard substrates. Fouling creates costs for a variety of industries including shipping and power production. Hull fouling reduces fuel efficiency and the fouling of intake pipes can restrict the proper functioning of machinery. |
Known measurable environmental impact? | Known References: Reinhardt, J. F., Hudson, D. M. 2012. A review of the life history, invasion process, and potential management of Clavelina lepadiformis Müller, 1776: a recent invasion of the northwest Atlantic. Management of Biological Invasions, 3(1), 1. Comments: Tunicates and other fouling organisms can compete with shellfish for food, occlude net or cage openings reducing flow and reduce oxygen availability. |
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: Reinhardt, J. F., Stefaniak, L. M., Hudson, D. M., Mangiafico, J., Gladych, R., Whitlatch, R. B. 2010. First record of the non-native light bulb tunicate Clavelina lepadiformis (Müller, 1776) in the northwest Atlantic. Aquatic Invasions, 5(2), pp. 185-190. Comments: The introduction likely resulted from hull fouling, fouling of sea chests, or (less likely) larvae transported in ballast water. |
Last update by | Sandra Gečaitė, 2024-08-06 |