![]() |
AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
| Species | Botryllus schlosseri [WoRMS] | |
| Authority | (Pallas, 1766) | |
| Family | Styelidae | |
| Order | Stolidobranchia | |
| Class | Ascidiacea | |
| Phylum | Chordata | |
| Synonym (?) | Golden star tunicate | |
| Sub-species level (?) | Not entered |
| Native origin (?) | Ocean: Atlantic --> Ocean region: NE Atlantic 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. References (not structured): Nydam ML, Giesbrecht KB, Stephenson EE. 2017. Origin and dispersal history of two colonial ascidian clades in the Botryllus schlosseri species complex. PLoS One 12: e0169944 Comments: Long been thought to be native to Europe, and recent molecular work has provided support for this hypothesis. [...] There is evidence from polymorphism and coalescent analyses that Clade A originated in the Pacific, but it also has had a long evolutionary history in the Mediterranean and has colonized the English Channel and the Bay of Biscay several times. The B. schlosseri species complex either originated in the Pacific Ocean and diversified after Clade A arrived in European waters, or originated in Europe, with ancestors of Clade A dispersing to the Pacific Ocean. A well resolved phylogenetic tree of B. schlosseri will allow us to determine the likely geographic origin of this species group |
| Life form / Life stage (?) |
References (not structured): De Kluijver MJ, Ingalsuo SS (2004) Botryllus schlosseri . Publisher Universiteit van Amsterdam http://ip30.eti.uva.nl/bis/tunicata.php?selected=beschrijving&menuentry=soorten&id=21 Accessed 21 March 2011 Comments: The golden star tunicate is a colonial species that forms flat circular or elongate sheets, up to 5 cm long and 2 cm broad. Their color are variable but often blue with arrangement with star-shaped systems of 3 to 12 individuals |
| Sociability / Life stage (?) |
References (not structured): Cima, F., Ballarin, L., Caicci, F., Franchi, N., Gasparini, F., Rigon, F., ... Manni, L. 2015. Life history and ecological genetics of the colonial ascidian Botryllus schlosseri. Zoologischer Anzeiger-A Journal of Comparative Zoology, 257, pp. 54-70. Comments: B. schlosseri is a colonial ascidian (Tunicata), widely distributed in shallow subarctic and temperate waters of both the hemispheres. |
| Reproductive frequency (?) | Iteroparous References (not structured): Ballarin, L., Manni, L. 2009. Stem cells in sexual and asexual reproduction of Botryllus schlosseri (Ascidiacea, Tunicata): an overview. Stem cells in marine organisms, pp. 267-280. |
| Reproductive type (?) | Asexual Sexual References: Ballarin, L., Manni, L. 2009. Stem cells in sexual and asexual reproduction of Botryllus schlosseri (Ascidiacea, Tunicata): an overview. Stem cells in marine organisms, pp. 267-280. De Kluijver MJ, Ingalsuo SS (2004) Botryllus schlosseri . Publisher Universiteit van Amsterdam http://ip30.eti.uva.nl/bis/tunicata.php?selected=beschrijving&menuentry=soorten&id=21 Accessed 21 March 2011 Comments: They are hermaphroditic, eggs shed and fertilized in the water. |
| Developmental trait (?) | Lecithotrophy Spawning References: De Kluijver MJ, Ingalsuo SS (2004) Botryllus schlosseri . Publisher Universiteit van Amsterdam http://ip30.eti.uva.nl/bis/tunicata.php?selected=beschrijving&menuentry=soorten&id=21 Accessed 21 March 2011 Hiscock, K. 2008. Botryllus schlosseri Star ascidian. In Tyler-Walters H. and Hiscock K. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 02-08-2024]. Available from: https://www.marlin.ac.uk/species/detail/1340 Comments: Up to eight eggs are produced per zooid. After fertilization and development to a tadpole stage, the tadpole is released and is free swimming for up to 36 hours. |
| Characteristic feeding method / Life stage (?) |
References (not structured): De Kluijver MJ, Ingalsuo SS (2004) Botryllus schlosseri . Publisher Universiteit van Amsterdam http://ip30.eti.uva.nl/bis/tunicata.php?selected=beschrijving&menuentry=soorten&id=21 Accessed 21 March 2011 Comments: Benthic suspension feeders. |
| Mobility / Life stage (?) |
References (not structured): Michael Allaby (2009) Ascidiacea. Oxford University,http://www.oxfordreference.com.ludwig.lub.lu.se/view /ENTRY.html?subview=Main&entry=t8.e675 Accessed 24 August 2010 Comments: Botryllus schlosseri is type of sea squirt, most of which inhabit shallow waters where they attach themselves to such structures as rocks, pilings, the bottoms of ships, and coral reefs. |
| Salinity tolerance range (?) | Exact range: 14 - 44 References: Dijkstra, J., Dutton, A., Westerman, E., Harris, L. 2008. Heart rate reflects osmostic stress levels in two introduced colonial ascidians Botryllus schlosseri and Botrylloides violaceus. Marine Biology, 154(5), pp. 805-811. |
| Habitat modifying ability potential (?) | Autogenic ecosystem engineers References: Cima, F., Ballarin, L., Caicci, F., Franchi, N., Gasparini, F., Rigon, F., ... Manni, L. 2015. Life history and ecological genetics of the colonial ascidian Botryllus schlosseri. Zoologischer Anzeiger-A Journal of Comparative Zoology, 257, pp. 54-70. |
| Toxicity / Life stage (?) | Not relevant |
| Bioaccumulation association (?) | Unknown Comments: Not available. |
| Known human health impact? | Not known Comments: Not available. |
| Known economic impact? | Known References: Goldstein, O., Mandujano-Tinoco, E. A., Levy, T., Talice, S., Raveh, T., Gershoni-Yahalom, O., ... Rosental, B. 2021. Botryllus schlosseri as a unique colonial chordate model for the study and modulation of innate immune activity. Marine Drugs, 19(8), 454. Comments: The colonial ascidian B. schlosseri is a common fouling organism in temperate harbors and on ships and has been called 'a fast-growing pernicious pest' on oyster trays in lower Chesapeake Bay, but is absent or rare on natural oyster beds, presumably because of siltation. However, it is an important experimental organism in embryology, genetics, and immunology. |
| Known measurable environmental impact? | Known References: Wong, M. C., Vercaemer, B. 2012. Effects of invasive colonial tunicates and a native sponge on the growth, survival, and light attenuation of eelgrass (Zostera marina). Aquatic Invasions, 7(3), pp. 315–326. Comments: The tunicate colonies can negatively impact these mollusks by competing for food and resources. |
| 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 (?) | 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. Comments: Populations in the western Atlantic may have arrived on shipping and it is likely that, as a fast-growing fouling organism, Botryllus schlosseri may spread readily to other parts of the world. |
| Last update by | Sandra Gečaitė, 2024-08-02 |