AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Botrylloides giganteus | |
Authority | (Pérès, 1949) | |
Family | Styelidae | |
Order | Stolidobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | Botrylloides pizoni References: Rocha, L. A., Bass, A. L., Robertson, D. R., & Bowen, B. W. (2002). Adult habitat preferences, larval dispersal, and the comparative phylogeography of three Atlantic surgeonfishes (Teleostei: Acanthuridae). Molecular Ecology, 11(2), 243-251. |
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Sub-species level (?) | Not entered |
Native origin (?) | Not known References: Rocha, R. M., Salonna, M., Griggio, F., Ekins, M., Lambert, G., Mastrototaro, F., Fidler, A., & Gissi, C. (2019). The power of combined molecular and morphological analyses for the genus Botrylloides: identification of a potentially global invasive ascidian and description of a new species. Systematics and Biodiversity, 17(5), 509-526. Comments: Type locality is Dakar (Senegal). Also known from South-Africa, Mozambique, Brazil, California, Galapagos, New Zealand, and South Italy (Taranto). |
Life form / Life stage (?) |
References (not structured): Lambert, G. 2019. Fouling ascidians (Chordata: Ascidiacea) of the Galápagos: Santa Cruz and Baltra Islands. Aquatic Invasions, 14(1), pp. 132-149. |
Sociability / Life stage (?) |
Comments: B. giganteus is a colonial tunicate. Colonial tunicates are communities of individuals, called zooids, which share a protective cellulose layer called a tunic. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Asexual Sexual Comments: Colonial tunicates reproduce both asexually, by budding, and sexually, from fertilized eggs developing into larvae. Buds can form from the body wall of the zooid. |
Developmental trait (?) | Brooding Viviparous References: Lambert, G. 2019. Fouling ascidians (Chordata: Ascidiacea) of the Galápagos: Santa Cruz and Baltra Islands. Aquatic Invasions, 14(1), pp. 132-149. |
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. |
Mobility / Life stage (?) |
Comments: The colonies of B. giganteus are 2-5 mm thick, translucent, and variable in size and shape, ranging from 30 to 150 mm in diameter. They can grow on algae or other debris. Botrylloides giganteus has linear systems of zooids, which are visible through the tunic. |
Salinity tolerance range (?) | Venice system: 6. Polymixohaline [18-30psu] 7. Euhaline [30-40psu] |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers References: Lambert, G. 2019. Fouling ascidians (Chordata: Ascidiacea) of the Galápagos: Santa Cruz and Baltra Islands. Aquatic Invasions, 14(1), pp. 132-149. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Not known Comments: Not available. |
Known economic impact? | Not known Comments: Not available. |
Known measurable environmental impact? | Known References: U.S. National Invasive Species Information Center. “Nemesis Species Summary: Halyomorpha Halys (Brown Marmorated Stink Bug).” Invasions.si.edu, U.S. National Invasive Species Information Center, https://invasions.si.edu/nemesis/species_summary/-253. Accessed 5 Aug. 2024. Comments: The colonial tunicate B. giganteum is a recent invader of San Diego Bay. At one location, in 1997, it covered extensive areas up to 100% cover, indicating strong competitive ability. |
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: Rocha, R. M., Salonna, M., Griggio, F., Ekins, M., Lambert, G., Mastrototaro, F., Fidler, A., & Gissi, C. (2019). The power of combined molecular and morphological analyses for the genus Botrylloides: identification of a potentially global invasive ascidian and description of a new species. Systematics and Biodiversity, 17(5), 509-526. References: Millar, R. H. (1955). On a collection of ascidians from South Africa. Proceedings of the Zoological Society of London, 125, 169–221. doi:10.1111/j.1096-3642.1955.tb00597.x Comments: "Millar (1955) observed that B. giganteus samples collected in 1950–1951 from Durban Bay were from artificial substrates including ship hulls and concluded that the species 'could easily be spread by ships' " |
Molecular information | Available NCBI (https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?term=Botrylloides+giganteus) |
Created by | Anna Occhipinti, 2020-06-15 |
Last update by | Sandra Gečaitė, 2024-08-05 |