AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Diplosoma listerianum [WoRMS] | |
Authority | (Milne Edwards, 1841) | |
Family | Didemnidae | |
Order | Aplousobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | Compound Sea squirt | |
Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Atlantic --> Ocean region: NE Atlantic Comments: Cosmopolitan. |
Life form / Life stage (?) |
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Sociability / Life stage (?) |
References (not structured): Marshall, D. J., Pechenik, J. A., Keough, M. J. 2003. Larval activity levels and delayed metamorphosis affect post-larval performance in the colonial ascidian Diplosoma listerianum. Marine Ecology Progress Series, 246, pp. 153-162. Comments: D. listerianum is a colonial tunicate that forms extensive thin encrusting sheets. |
Reproductive frequency (?) | Iteroparous References (not structured): Bishop, J. D., Pemberton, A. J., Sommerfeldt, A. D., Wood, C. A. 2001. Laboratory studies of mating in the aplousobranch Diplosoma listerianum. The biology of ascidians, pp. 305-310. |
Reproductive type (?) | Asexual Sexual References: Burighel, P., Martinucci, G. B. 1994. Sexual reproduction in the compound ascidian Diplosoma listerianum (Tunicata). I. Metamorphosis, storage and phagocytosis of sperm in female duct. Marine Biology, 118, pp. 489-498. Comments: Colonial tunicates reproduce both asexually by budding and sexually from fertilized eggs that develop into larvae. Buds can form from the body wall of the zooids. |
Developmental trait (?) | Brooding Lecithotrophy Spawning References: Bishop, J. D., Pemberton, A. J., Sommerfeldt, A. D., Wood, C. A. 2001. Laboratory studies of mating in the aplousobranch Diplosoma listerianum. The biology of ascidians, pp. 305-310. Comments: D. listerianum exemplifies colonial ascidians in releasing sperm into the water to be captured by neighbours to fertilize brooded eggs. Fertilized eggs are brooded within the tunic until they hatch into lecithotrophic (non-feeding, yolk-dependent) tadpole larvae. |
Characteristic feeding method / Life stage (?) |
Comments: D. listerianum is a filter feeder. Water, carrying numerous small food particles, flows through the oral siphon. The particles get caught in mucus produced by a gland called the endostyle. Water carrying waste flows out of the sea squirt via the atrial siphon. Feeds on: zooplankton, detritus. |
Mobility / Life stage (?) |
References (not structured): Marshall, D. J., Pechenik, J. A., Keough, M. J. 2003. Larval activity levels and delayed metamorphosis affect post-larval performance in the colonial ascidian Diplosoma listerianum. Marine Ecology Progress Series, 246, pp. 153-162. Comments: The freely swimming larvae of D. listerianum enable the species to spread easily. The larvae move by alternately swimming upwards towards the light, followed by sinking. They avoid the bottom. When the larvae are ready to settle, they attach themselves to a shady and predator-sheltered place, such as a rock’s sidewall. |
Salinity tolerance range (?) | Exact range: 18 - 40 References: Smithsonian Environmental Research Center. (n.d.) Diplosoma listerianum species summary. National Estuarine and Marine Exotic Species Information System (NEMESIS). Available at: https://invasions.si.edu/nemesis/species_summary/159099 (Accessed: 8 August 2024). |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Known Comments: Harmless. |
Known economic impact? | Known References: Rocha, R. M., Kremer, L. P., Baptista, M. S., Metri, R. 2009. Bivalve cultures provide habitat for exotic tunicates in southern Brazil. Aquatic invasions, 4(1), pp. 195-205. Comments: D. listerianum has been reported to foul cultured shellfish. Also, because of the thinness of D. listerianum colonies, its impact on mussel growth might be small, but this hypothesis still needs to be tested. |
Known measurable environmental impact? | Known References: Smithsonian Environmental Research Center. (n.d.) Diplosoma listerianum species summary. National Estuarine and Marine Exotic Species Information System (NEMESIS). Available at: https://invasions.si.edu/nemesis/species_summary/159099 (Accessed: 8 August 2024). Comments: In experiments in Long Island Sound, Diplosoma listerianum significantly reduced recruitment of native Spirorbis spp, Bugula spp, and Balanus spp, mostly through overgrowth of newly settled individuals. |
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: Smithsonian Environmental Research Center. (n.d.) Diplosoma listerianum species summary. National Estuarine and Marine Exotic Species Information System (NEMESIS). Available at: https://invasions.si.edu/nemesis/species_summary/159099 (Accessed: 8 August 2024). Comments: D. listerianum is an abundant fouling organism (Lambert 2002), known from docks, buoys, floats, and ship hull. |
Created by | Aleksas Narščius, 2017-06-01 |
Last update by | Sandra Gečaitė, 2024-08-08 |