AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Amathia gracilis [WoRMS] | |
Authority | (Leidy, 1855) | |
Family | Vesiculariidae | |
Order | Ctenostomatida | |
Class | Gymnolaemata | |
Phylum | Bryozoa | |
Synonym (?) | Amathia gracilis Bowerbankia gracilis |
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Sub-species level (?) | gracilis |
Native origin (?) | Ocean: Atlantic --> Ocean region: NE Atlantic References (not structured): Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. |
Life form / Life stage (?) |
References (not structured): Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. Jebram, D. 1975 – Deuerknospen (“Hibernacula”) bei den Bryozoa Ctenostomata in mesohalinen und vollmarinen Gewassern. Marine Biology 31, 129-137. Comments: There is also a resting stage: heterozoides specialized in resistance function, they form it in condition of low salinity and temperature (Jebram, 1975). |
Sociability / Life stage (?) |
References (not structured): Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. |
Reproductive frequency (?) | Iteroparous References (not structured): Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. |
Reproductive type (?) | Asexual Self-fertilization Sexual References: Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. |
Developmental trait (?) | Brooding Lecithotrophy References: Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. Winston J.E. 1982 – Marine Bryozoans (Ectoprocta) of the Indian River Area (Florida) – Bull. Amer. Mus. Nat. Hist. 173(2): 99-176 Comments: Eggs are brooded internally, usually in zooids whose polypides have degenerated. Embryos are peach coloured. Larvae are short-lived, elongate coronate. |
Characteristic feeding method / Life stage (?) |
References (not structured): Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. |
Mobility / Life stage (?) |
References (not structured): Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. |
Salinity tolerance range (?) | Exact range: 15 - 30 References: Occhipinti Ambrogi A., 1981. Briozoi lagunari. CNR AQ/1/126 Winston J.E., 1995 – Ectoproct diversity of the Indian River Coastal Lagoon. Bulletin of Marine Science, 57, 84-93 |
Habitat modifying ability potential (?) | Not entered |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Not entered |
Known human health impact? | Known Comments: There are no significant direct human health impacts known from A. gracilis. |
Known economic impact? | Not entered |
Known measurable environmental impact? | Known References: Gittenberger, A., Rensing, M., van der Veer, H.W., Philippart, C.J.M., van der Hoorn, B., D’Hont, A., Wesdorp, K.H., Schrieken, N., Klunder, L., Kleine-Schaars, L., Holthuijsen, S., Stegenga, H. 2019. Native and non-native species of the Dutch Wadden Sea in 2018. Commissioned by Office for Risk Assessment and Research, The Netherlands Food and Customer Product Safety Authority of the Ministry of Agriculture, Nature and Food Quality. GiMaRIS rapport 2019_09, pp. 128. Comments: Amathia gracilis is recognized as an invasive seawee, rapid growth and ability to colonize substrates such as rocks and artificial structures contribute to its competitive advantage over native species. |
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) |
Association with vessel vectors (?) | Biofouling References: Hayward P.J., 1985 – Ctenostome Bryozoans - Synopses of the British Fauna (New Series) edited by Doris M. Kermack and R.S.K. Barnes. N° 33. 169pp. |
Last update by | Sandra Gečaitė, 2024-07-03 |