AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Alkmaria romijni [WoRMS] | |
Authority | Horst, 1919 | |
Family | Ampharetidae | |
Order | Terebellida | |
Class | Polychaeta | |
Phylum | Annelida | |
Synonym (?) | Microsamytha ryckiana | |
Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Atlantic |
Life form / Life stage (?) |
References (not structured): Jensen, Kathe R. (2010): NOBANIS – Invasive Alien Species Fact Sheet – Alkmaria romijni – From: Identification key to marine invasive species in Nordic waters – NOBANIS www.nobanis.org, Date of access x/x/201x. Comments: Alkmaria romijni is viviparous. Embryos develop inside the female, and further development takes place inside the tube. |
Sociability / Life stage (?) |
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Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Sexual Comments: Larval development lasts 3 months. Larvae reside within the tubes of the female for up to the first twelve days. They then become free-living on the surface of the sediment and develop their own tube at about 20 days. |
Developmental trait (?) | Lecithotrophy Viviparous Comments: Unlike most polychaetes, they lack a planktonic larval stage. Instead, the larvae develop inside the mother and then live within her tube for around 12 days before moving onto the surface of the mud. These larvae then build a tube of their own at around 20 days old. Because the larvae do not spend any time suspended in the plankton, the species cannot easily disperse over large distances, making them highly vulnerable to habitat disturbance and degradation. |
Characteristic feeding method / Life stage (?) |
References (not structured): Chaouti, A., Bayed, A. 2006. First record of Alkmaria romijni Horst, 1919 (Polychaeta: Ampharetidae) from the Mediterranean coast (Smir Lagoon, Morocco). Marine Life, 16, pp. 15-19. Comments: The worms use the tentacles around their mouths to feed on detritus which has settled on the sediment surface near their tubes. The species is devoid of the teeth suited for herbivory, but has 8 retractile buccal (mouth) tentacles able to stretch ahead to collect the food particles. The species is considered as surface deposit-feeder and detritivore depending on its occurrence at shallowest depth or on vegetal surface respectively. |
Mobility / Life stage (?) |
Comments: Adults live within the sediment in durable mud tubes, the top of which protrude above the sediment surface. |
Salinity tolerance range (?) | Venice system: 2. β-Oligohaline [0.5-3psu] 3. α-Oligohaline [3-5psu] 4. β-Mesohaline [5-10psu] 5. α-Mesohaline [10-18psu] 6. Polymixohaline [18-30psu] 7. Euhaline [30-40psu] References: Кочешкова, О. В., and Е. Е. Ежова. "О чужеродных видах полихет в российской части юго-восточной Балтики." Морской биологический журнал 3, no. 2 (2018): 53-63. Chaouti, A., Bayed, A. 2006. First record of Alkmaria romijni Horst, 1919 (Polychaeta: Ampharetidae) from the Mediterranean coast (Smir Lagoon, Morocco). Marine Life, 16, pp. 15-19. Comments: he species is found in the Vistula lagoon, where average salinity is ca. 3.8 (Kocheshkova and Ezhova, 2018) Alkmaria romijni is known from salinities of 5 to 48 ppt, but it's preferred range is thought to be 5 to 20 ppt. |
Habitat modifying ability potential (?) | Allogenic ecosystem engineers References: Chaouti, A., Bayed, A. 2006. First record of Alkmaria romijni Horst, 1919 (Polychaeta: Ampharetidae) from the Mediterranean coast (Smir Lagoon, Morocco). Marine Life, 16, pp. 15-19. Comments: The species is a tube builder and occurs in small thick tube of mucus covered by particles and various remnants and dug into the sediment. These tubes extend above the sediment surface, where the worm feeds on settling organic matter using its tentacles. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Nunes, M., Coelho, J. P., Cardoso, P. G., Pereira, M. E., Duarte, A. C., Pardal, M. A. 2008. The macrobenthic community along a mercury contamination in a temperate estuarine system (Ria de Aveiro, Portugal). Science of the Total Environment, 405(1-3), pp. 186-194. |
Known human health impact? | Not known Comments: Not available. |
Known economic impact? | Not known Comments: Not available. |
Known measurable environmental impact? | Not known Comments: Not available. |
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 (?) | Unknown Comments: Not available. |
Molecular information | Not available |
Last update by | Sandra Gečaitė, 2024-08-01 |