AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Caulacanthus okamurae [WoRMS] | |
Authority | Yamada, 1933 | |
Family | Caulacanthaceae | |
Order | Gigartinales | |
Class | Florideophyceae | |
Phylum | Rhodophyta | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Country: China Country: Japan Country: Korea, Democratic Peoples Republic of Country: Korea, Republic of Country: Taiwan References (not structured): Petrocelli, A., Wolf, M. A., Cecere, E., Sciuto, K., Sfriso, A. 2020. Settlement and spreading of the introduced seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea. Diversity, 12(4), 129. Comments: North-Eastern Pacific |
Life form / Life stage (?) |
References (not structured): Petrocelli, A., Wolf, M. A., Cecere, E., Sciuto, K., Sfriso, A. 2020. Settlement and spreading of the introduced seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea. Diversity, 12(4), 129. |
Sociability / Life stage (?) |
Comments: C. okamurae is a low-growing mat-forming red alga that can grow in dense turfs on the mid-to-upper intertidal zone of exposed rocky coasts as well as in sheltered areas. |
Reproductive frequency (?) | Not entered |
Reproductive type (?) | Asexual Sexual References: Choi, H. G., Nam, K. W., Norton, T. A. 2001. No whirlwind romance: typhoons, temperature and the failure of reproduction in Caulacanthus okamurae (Gigartinales, Rhodophyta). European Journal of Phycology, 36(4), pp. 353-358. Comments: C. okamurae has a two-phased life cycle, with haploid gametophytes, producing carpospores, and diploid tetrosporophytes, producing haploid tetrospores. However, in Korea, where it is native, the reproductive stages are rarely seen, and most of the plants reproduce vegetatively. In culture, temperatures above 19°C were required for sexual reproduction. |
Developmental trait (?) | Not entered |
Characteristic feeding method / Life stage (?) |
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Mobility / Life stage (?) |
References (not structured): Petrocelli, A., Wolf, M. A., Cecere, E., Sciuto, K., Sfriso, A. 2020. Settlement and spreading of the introduced seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea. Diversity, 12(4), 129. Comments: In the Venice Lagoon C. okamurae grows strongly attached to the midlittoral docks and stones of jetties and breakwater barriers. |
Salinity tolerance range (?) | Unknown Comments: Not available. |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers References: Petrocelli, A., Wolf, M. A., Cecere, E., Sciuto, K., Sfriso, A. 2020. Settlement and spreading of the introduced seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea. Diversity, 12(4), 129. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Park, C. S., Wi, M. Y., Hwang, E. K. 2008. The concentrations of heavy metals in the seawater, sediment and seaweed in Mokpo coastal region, southwestern coast of Korea. Korean Journal of Environmental Biology, 26(4), pp. 303-310. |
Known human health impact? | Known Comments: Harmless. |
Known economic impact? | Not known Comments: Not available. |
Known measurable environmental impact? | Known Comments: This dense, low turf habitat decreased the number of larger intertidal fauna (periwinkles, limpets, barnacles), but favored meiofauna (copepods and ostracods) and larger fleshy seaweeds by retaining water and decreasing desiccation. |
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: Vectors on the West Coast probably include hull-fouling, ballast water, and oyster-culture. |
Created by | Aleksas Narščius, 2019-01-30 |
Last update by | Sandra Gečaitė, 2024-08-05 |