AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Ectopleura crocea [WoRMS] | |
Authority | (Agassiz, 1862) | |
Family | Tubulariidae | |
Order | Anthoathecata | |
Class | Hydrozoa | |
Phylum | Cnidaria | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Atlantic --> Ocean region: NE Atlantic References (not structured): Piazzola, C.D. 2015. Ectopleura crocea. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. |
Life form / Life stage (?) |
References (not structured): Piazzola, C.D. 2015. Ectopleura crocea. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. Comments: Actinula larvae are the larval stage; these larvae attach to substrate and become a new polyp. |
Sociability / Life stage (?) |
References (not structured): Piazzola, C.D. 2015. Ectopleura crocea. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. Comments: The only form of E. crocea is the large, colonial polyp. The medusa is not free swimming; though it is biologically similar to other free-swimming hydromedusa, it is entirely retained in the tissue of the gonophore. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Asexual Sexual References: Piazzola, C.D. 2015. Ectopleura crocea. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. Comments: The polyps can reproduce both sexually and asexually. In asexual reproduction, new hydranths can grow from the stolons (horizontal shoots at the base of each hydrocaulus). Ectopleura crocea is dioecious, so each colony is entirely male or entirely female during sexual reproduction. The gonophores correspond to the medusae stage in other hydroids, and so are called gonomedusae. In the summer, male gonomedusae release their sperm, which are attracted to the female gonomedusae and their eggs. |
Developmental trait (?) | Spawning References: Piazzola, C.D. 2015. Ectopleura crocea. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. Comments: Female gonophores produce multiple eggs, typically 2–4, which are brooded and fertilized by sperm in the water column. The egg develops in the gonophore through the planula stage into an actinula. Larvae spend about 24 hours in the water column. |
Characteristic feeding method / Life stage (?) |
Comments: E. crocea feeds on both planktonic and benthic prey, including diatoms, bivalve larvae, and crustaceans. |
Mobility / Life stage (?) |
Comments: Ectopleura crocea grows profusely on rocks and boat docks. |
Salinity tolerance range (?) | Exact range: 23 - 34 References: Accs, U. (n.d.) Ectopleura crocea. Available at: https://accs.uaa.alaska.edu/wp-content/uploads/ectopleuracrocea.pdf (Accessed: 8 August 2024). Comments: Based on geographic distribution, E. crocea's salinity range is estimated to range from 23 to 34 ppt. |
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: Lin, H., Wang, J., Liu, W., Liu, K., Zhang, S., He, X., ... Yan, T. 2017. Fouling community characteristics in subtropical coastal waters of the southwestern East China Sea. Acta Oceanologica Sinica, 36, pp. 70-78. Comments: Ectopleura crocea has been reported from pilings, buoys, jetties, pipes, and ship hulls. |
Known measurable environmental impact? | Known References: Fitridge, I., Keough, M. J. 2013. Ruinous resident: the hydroid Ectopleura crocea negatively affects suspended culture of the mussel Mytilus galloprovincialis. Biofouling, 29(2), pp. 119-131. Comments: Fouling by E. crocea is detrimental to mussel condition, and may affect the availability of wild mussel larvae in the commercial culture of M. galloprovincialis. |
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]. |
Created by | Aleksas Narščius, 2017-10-11 |
Last update by | Sandra Gečaitė, 2024-08-08 |