AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Ciona intestinalis | |
Authority | Linnaeus, 1767 | |
Family | Cionidae | |
Order | Phlebobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | Vase tunicate | |
Sub-species level (?) | Not entered |
Native origin (?) | Not known Comments: Northeast Atlantic Ocean |
Life form / Life stage (?) |
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Sociability / Life stage (?) |
References (not structured): Havenhand, J. N., Svane, I. B. 1991. Ciona intestinalis. Mar. Ecol. Prog. Ser, 68, pp. 271-276. Comments: The tunicate C. intestinalis, is a solitary tunicate with an elongated, cylindrical or vase-shaped body that can reach a length of 150 mm long. It is widest near the permanently attached posterior end and tapers toward the anterior end. The tunic can be transparent, translucent, or white. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Sexual References: Yamaguchi, M. 1975. Growth and reproductive cycles of the marine fouling ascidians Ciona intestinalis, Styela plicata, Botrylloides violaceus, and Leptoclinum mitsukurii at Aburatsubo-Moroiso Inlet (Central Japan). Marine Biology, 29, pp. 253-259. Comments: Permanent (synchronous) hermaphrodite. C. intestinalis reproduction throughout the year. In more northerly populations, gamete release peaks in May / June. |
Developmental trait (?) | Spawning References: Havenhand, J. N., Svane, I. B. 1991. Ciona intestinalis. Mar. Ecol. Prog. Ser, 68, pp. 271-276. Comments: Eggs and sperm, when released, can stay in the water column for 1 to 2 days, while the larvae are free-swimming for 2 to 10 days. |
Characteristic feeding method / Life stage (?) |
Comments: C. intestinalis, like other tunicates, is a filter-feeder, and are capable of retaining particles as small as 1 um. It may have the ability to select larger particles. The filter feeding of C. intentinalis populations can greatly impact on phytoplankton abundance, making it as a key species in habitats where it occurs abundantly. |
Mobility / Life stage (?) |
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Salinity tolerance range (?) | Exact range: 12 - 40 References: Therriault, T. W., Herborg, L. M. 2008. Predicting the potential distribution of the vase tunicate Ciona intestinalis in Canadian waters: informing a risk assessment. ICES Journal of Marine Science, 65(5), pp. 788-794. |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers References: Rosa, M., Holohan, B. A., Shumway, S. E., Bullard, S. G., Wikfors, G. H., Morton, S., Getchis, T. 2013. Biofouling ascidians on aquaculture gear as potential vectors of harmful algal introductions. Harmful Algae, 23, pp. 1-7. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Gallo, A., Tosti, E. 2015. The ascidian Ciona intestinalis as model organism for ecotoxicological bioassays. Journal of Marine Science: Research & Development, 5(03). Comments: C. intestinalis as a bioindicator for marine pollution monitoring. |
Known human health impact? | Not known Comments: Not available. |
Known economic impact? | Known References: Carver, C. E., Chisholm A, Mallet, A. L. 2003. Strategies to mitigate the impacts of Ciona intestinalis biofouling on shellfish production., Journal of Shellfish Research, 22, 521-631 pp. Rosa, M., Holohan, B. A., Shumway, S. E., Bullard, S. G., Wikfors, G. H., Morton, S., Getchis, T. 2013. Biofouling ascidians on aquaculture gear as potential vectors of harmful algal introductions. Harmful Algae, 23, pp. 1-7. Comments: Its most serious economic impacts have been on shellfish aquaculture in Nova Scotia where tunicates are said to reduce the growth rates of mussels and foul culturing ropes. Another negative potential impact of C. intestinalis and other tunicates is that when they foul aquaculture gear and boats they can retain and transport viable cells and cysts of toxic phytoplankton. |
Known measurable environmental impact? | Known References: Carver, C. E., Chisholm, A., Mallet, A. L. 2003. Strategies to mitigate the impact of Ciona intestinalis (L.) biofouling on shellfish production. Journal of Shellfish Research, 22(3), pp. 621-632. Comments: C. intestinalis is a formidable competitor since it can quickly erupt and replace other species in fouling communities, both in its native and introduced ranges. |
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 (?) | Ballast waters Biofouling References: Hewitt, C. L., Campbell, M. L., Thresher, R. E., Martin, R. B., Boyd, S., Cohen, B. F., ... & Lockett, M. M. (2004). Introduced and cryptogenic species in port Phillip bay, Victoria, Australia. Marine biology, 144(1), 183-202. |
Created by | Aleksas Narščius, 2016-12-15 |
Last update by | Sandra Gečaitė, 2024-08-06 |