AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Watersipora subatra | |
Date of the first record (?) | 2011 References (not structured): Kelso A, Wyse Jackson PN (2012) Invasive bryozoans in Ireland: first record of Watersipora subtorquata (d’Orbigny, 1852) and an extension of the range of Tricellaria inopinata d’Hondt and Occhipinti Ambrogi, 1985. BioInvasions Records 1: 209-214. Comments: Currently recognised as Watersipora subatra. Species is expanding in western Europe. |
Recipient region (?) | Country: Ireland LME: 24. Celtic-Biscay Shelf LME sub-region: Celtic seas References: Porter, J. S., Nunn, J. D., Ryland, J. S., Minchin, J. D., & Jones, M. E. S. (2017). The status of non-native bryozoans on the north coast of Ireland. BioInvasions records, 6(4), 321-330. References (not structured): Kelso A, Wyse Jackson PN (2012) Invasive bryozoans in Ireland: first record of Watersipora subtorquata (d’Orbigny, 1852) and an extension of the range of Tricellaria inopinata d’Hondt and Occhipinti Ambrogi, 1985. BioInvasions Records 1: 209-214. Loxton J, Wood CA, Bishop JDD, Porter JS, Spencer Jones M, Nall CR (2017) Distribution of the invasive bryozoan Schizoporella japonica in Great Britain and Ireland and a review of its European distribution. Biological Invasions 19: 2225–2235, Comments: Found at a marina on the east coast of Ireland in Dublin Bay at Dun Laoghaire and Greystones harbours. Also known from the narrows of Mulroy Bay. In 2012 was found on the north Irish coast for the first time. |
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Source region (?) | Not entered References (not structured): D’Hondt JL (1984) Un nouvel immigrant dans le Bassin d’Arcachon, Watersipora aterrima (Ortmann, 1890)(Bryozoaire Cheilostome). 109e Congrès national des Sociétés savantes, Dijon, 1984, Sciences, pp 237–245. Comments: Originally introduced to the Atlantic coast of France with Crassostrea gigas during the period 1968 and 1973 and subsequently spread on boat hulls and oyster consignments. D'Hondt originally described the species as W. aterrima, a Japanese bryozoan. |
Pathway / Vector (?) | Level of certainty: Highly likely Pathway: Vessels Vector: (Highly likely) Ship’s hull References: Porter, J. S., Nunn, J. D., Ryland, J. S., Minchin, J. D., & Jones, M. E. S. (2017). The status of non-native bryozoans on the north coast of Ireland. BioInvasions records, 6(4), 321-330. References (not structured): Kelso A, Wyse Jackson PN (2012) Invasive bryozoans in Ireland: first record of Watersipora subtorquata (d’Orbigny, 1852) and an extension of the range of Tricellaria inopinata d’Hondt and Occhipinti Ambrogi, 1985. BioInvasions Records 1: 209-214. Minchin D, Nunn J (2013) Rapid assessment of marinas for invasive alien species in Northern Ireland. A report undertaken for the Northern Ireland Environment Agency, Belfast. 96pp. Floerl O, Pool TK, Inglis GJ (2004) Positive indications between nonindigenous species facilitate transport by human vectors. Ecological Applications 14: 1724-1736. D’Hondt JL (1984) Un nouvel immigrant dans le Bassin d’Arcachon, Watersipora aterrima (Ortmann, 1890) (Bryozoaire Cheilostome). 109e Congrès national des Sociétés savantes, Dijon, 1984, Sciences, pp 237–245. Comments: Almost certainly spread on the hulls of small craft. All indications suggest that the high occurrence in marinas implicates it was transmitted as hull fouling. However, oyster movements have also been implicated in its spread but the sites in Ireland are not in the vicinity of oyster farms. Indeed the first record in Europe is from the Bay of Arcachon, France having arrived about 1968 to 1973, during the period when arrivals of Pacific oyster consignments were flown in to France from Japan. At the north coast of Ireland there was found one more transport vector - floating macroalga Himanthalia. |
Habitat type (?) | Marina References (not structured): Kelso A, Wyse Jackson PN (2012) Invasive bryozoans in Ireland: first record of Watersipora subtorquata (d’Orbigny, 1852) and an extension of the range of Tricellaria inopinata d’Hondt and Occhipinti Ambrogi, 1985. BioInvasions Records 1: 209-214. Minchin D, Nunn J (2013) Rapid assessment of marinas for invasive alien species in Northern Ireland. A report undertaken for the Northern Ireland Environment Agency, Belfast. 96pp. Comments: Both localities where the species has been found were at marinas sites. |
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Wave exposure (?) | Sheltered References (not structured): Minchin D, Nunn J (2013) Rapid assessment of marinas for invasive alien species in Northern Ireland. A report undertaken for the Northern Ireland Environment Agency, Belfast. 96pp. Comments: Marinas were situated in sheltered localities. |
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Salinity range (?) | Not entered | |
Temperature range (?) | Not entered |
Zonation / Substratum (?) | Benthic and Pelagic: Littoral (Pelagic) Sublittoral within photic zone Substratum: Artificial (manmade) Biogenic (living or nonliving) References (not structured): Minchin D, Nunn J (2013) Rapid assessment of marinas for invasive alien species in Northern Ireland. A report undertaken for the Northern Ireland Environment Agency, Belfast. 96pp. Comments: Currently it is only known from its attachment to mussels and a sponge that were attached to floating pontoons at marina sites. Elsewhwere it is often found overgrowing marine algae and on some of the growths may become foliose. |
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Reproductive duration (?) | Not entered | |
Reproductive seasonality (?) | Not entered | |
Migration pattern (?) | Not entered |
Population status (?) | Common (Moderate level of certainty) References (not structured): Minchin D, Nunn J (2013) Rapid assessment of marinas for invasive alien species in Northern Ireland. A report undertaken for the Northern Ireland Environment Agency, Belfast. 96pp. Comments: Small numbers of this species were recovered. A further record was made in the North of Ireland in 2012 at Ardglass. It is unclear whether the species is recruiting. |
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Species status (?) | Non-indigenous species References (not structured): Kelso A, Wyse Jackson PN (2012) Invasive bryozoans in Ireland: first record of Watersipora subtorquata (d’Orbigny, 1852) and an extension of the range of Tricellaria inopinata d’Hondt and Occhipinti Ambrogi, 1985. BioInvasions Records 1: 209-214. Ryland JS, De Blauwe H, Lord R, Mackie JA (2009) Recent discoveries of alien Watersipora (Bryozoa) in Western Europe, with redescriptions of species. Zootaxa 2093: 43-59. Mawatari S (1952) on Watersipora cucullata (Busk) 1. Systematic study: Miscellaneous Reports of the Tokyo Research Institute of Natural Resources 25: 14-17. Comments: The species is considered to be highly invasive. There are two colour morphs the orange form being the one found to 2012 in Ireland. The dark form (also referred to as: purple, black, dark brown) has been found in France usually associated with oysters. The orange morph was first located from Guernsey from a marina in 2007. The species is widely distributed world-wide but it is thought to have originated in the Pacific. |
Created by | Dan Minchin, 2013-10-18 |
Last update by | Dan Minchin, 2022-03-03 |