AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Amphibalanus improvisus [WoRMS] | |
Authority | (Darwin, 1854) | |
Family | Balanidae | |
Order | Sessilia | |
Class | Hexanauplia | |
Phylum | Arthropoda | |
Synonym (?) | Balanus improvisus (Darwin, 1854) | |
Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Atlantic --> Ocean region: NW Atlantic Comments: SW America Eastern Americas W Atlantic |
Life form / Life stage (?) |
References (not structured): Leppäkoski E (1999) Balanus improvisus (Darwin 1854), Balanidae, Cirripedia. In: Exotics across the ocean. Case histories on introduced species: their general biology, distribution, range expansion and impact. Published by University of Kiel, Germany, Department of Fishery Biology, Institute for Marine Science: 49-54 Comments: Cypris larvae are most prone to settling when they are 3-4 days old. Settlement increases in the presence of extract from adult conspecifics, and significantly more cyprids settled at 5 and 10 ppt than at other salinities between 2 and 35 ppt. Also, the cyprids prefer rough surfaces over smooth ones, and preferentially settle in depressions. |
Sociability / Life stage (?) |
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Reproductive frequency (?) | Iteroparous References (not structured): Weidema IR (2000) Introduced species in the nordic countries. Nord 2000, 13: 242p. |
Reproductive type (?) | Self-fertilization Sexual References: Furman ER, Yule AB (1990) Self-fertilisation in Balanus improvisus Darwin. Journal of Experimental Marine Biology and Ecology, Vol.144 (2-3): 235-239 Comments: Acorn barnacles are hermaphrodites and are also able to be facultative self-fertilisers. |
Developmental trait (?) | Spawning References: Leppäkoski E (1999) Balanus improvisus (Darwin 1854), Balanidae, Cirripedia. In: Exotics across the ocean. Case histories on introduced species: their general biology, distribution, range expansion and impact. Published by University of Kiel, Germany, Department of Fishery Biology, Institute for Marine Science: 49-54 |
Characteristic feeding method / Life stage (?) |
References (not structured): Weidema IR (2000) Introduced species in the nordic countries. Nord 2000, 13:pp 242 Comments: Adult A. improvisus is a filter/suspension feeder which feeds on microplankton and deitritus Filter feeding barnacle transfer organic material from the watermass to the sediment (biodeposition). |
Mobility / Life stage (?) |
References (not structured): Birshtain JA, Vinogradov LT, Kondakov NN, Kun MS, Astakhova TV,Romanova NN (1968) The Atlas of Caspian Sea invertebrates. Moscow, “Pishevaja promyshlennost”, 415 p. (in Russian). Comments: Inhabits sub-littoral, stony and rocky bottoms, often can be found on the ship hulls, hydro technical constructions, on the sluices, sometimes attaches to the crayfishes, crabs and other animals. It also can be met attached to algae (Fucus vesiculosus). Sessile animals. Nauplial larvae - free swimming. |
Salinity tolerance range (?) | Exact range: 0.5 - 8.8 References: Olenin, S., & Daunys, D. (2004). Coastal typology based on benthic biotope and community data: the Lithuanian case study. Coastline Reports, 4, 65-84. References: Jarvekiulg A (1979) The bottom fauna of the eastern part of the Baltic Sea. Tallinn, Valgus: 382pp. (in Russian). |
Habitat modifying ability potential (?) | OLD VALUE Comments: --/OLD VALUE/-- Bioconstructor: Balanus improvisus is a strong competitor for space but it does not have a negative effect on community diversity in the Baltic. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Nasrolahi, A. 2017. Biomonitoring of trace metal bioavailability in the barnacle Amphibalanus improvisus along the Iranian coast of the Caspian Sea. Iranian Journal of Fisheries Sciences, 16(1), pp. 1-25. |
Known human health impact? | Not known Comments: Not available. |
Known economic impact? | Known References: Gren, I. M., Isacs, L., Carlsson, M. 2007. Calculation of costs of alien invasive species in Sweden-technical report (No. 2007: 7). Institutionen för Ekonomi. Comments: A. improvisus is a frequent fouler of power plants in its native and introduced range. In Sweden, estimated costs of power plant fouling by A. improvisus were 1.5-5.5 million dollars per year (Gren et al., 2007). |
Known measurable environmental impact? | Known References: Leppakoski, E., Olenin, S. 2000. Non-native species and rates of spread: lessons from the brackish Baltic Sea. Biological Invasions, 2, pp. 151-163. Kotta, J., Kotta, I., Simm, M., Lankov, A., Lauringson, V., Põllumäe, A., Ojaveer, H. (2006). Ecological consequences of biological invasions: three invertebrate case studies in the north-eastern Baltic Sea. Helgoland Marine Research, 60, pp. 106-112. Comments: In the Baltic Sea, A. improvisus is reported to affect the recreational quality of shorelines by fouling rocks and littering beaches with its sharp shells. On the other hand, its large filter-feeding biomass increases the clarity of the water (Olenin and Leppakoski, 2000). In experiments, settled A. improvisus indirectly promoted the growth of the green alga, Ulva (Enteromorpha) intestinalis, by filtering phytoplankton, remineralizing nutrients, and increasing the clarity of the water (Kotta et al., 2006). |
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 (?) | Ballast waters Biofouling References: Gollasch S, Macdonald E, Belson S, Botnen H, Christensen JT, Hamer JP, Houvenaghel G, Jelmert A, Lucas I, Masson D, McCollin T, Olenin S, Persson A, Wallentinus I, Wetsteyn LPMJ, Wittling T (2002) Life in Ballast Tanks In: Invasive aquatic species of Europe - distribution, impact and management. Kluwer Academic Publishers: 217-231 References: Bishop MWH (1951) Distribution of Barnacles by Ships. Nature 167, 531 |
Last update by | Sandra Gečaitė, 2024-07-03 |