AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Heterosigma akashiwo [WoRMS] | |
Authority | (Y.Hada) Y.Hada ex Y.Hara & M.Chihara, 1987 | |
Family | Chattonellaceae | |
Order | Chattonellales | |
Class | Raphidophyceae | |
Phylum | Ochrophyta | |
Synonym (?) | Heterosigma carterae References (not structured): Tucker & Hargreaves (eds.) 2008. Environmental best management practices for aquaculture, Blackwell |
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Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Pacific Comments: Japan |
Life form / Life stage (?) |
Comments: H. akashiwo produces cysts as a resting stage. The germination of these cysts leads to large-scale blooms, which can be laterally transferred by tides and currents. |
Sociability / Life stage (?) |
Comments: Not available. |
Reproductive frequency (?) | Not known Comments: Not available. |
Reproductive type (?) | Asexual Sexual References: Kim, J. H., Park, B. S., Kim, J. H. 2023. Comprehensive understanding of the life history of harmful raphidophyte Heterosigma akashiwo: Integrating in situ and in vitro observations. Harmful Algae, 129, 102521. Comments: They have complex life cycles that include sexual and asexual reproduction and appear to lack globins. |
Developmental trait (?) | Resting stages |
Characteristic feeding method / Life stage (?) |
Comments: Heterosigma akashiwo is a mixotrophic alga, supplementing nutrient uptake and photosynthesis with ingestion of bacteria. Each cell may contain 18-27 chloroplasts. |
Mobility / Life stage (?) |
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Salinity tolerance range (?) | Exact range: 5 - 40 References: Martínez, R., Orive, E., Laza-Martínez, A., Seoane, S. 2010. Growth response of six strains of Heterosigma akashiwo to varying temperature, salinity and irradiance conditions. Journal of Plankton Research, 32(4),pp. 529-538. Comments: Heterosigma grows optimally at salinities around 20–25 psu, although it is able to cross steep salinity gradients (5.7 psu). The salinity range for its growth was established by Honjo between 20 and 35 psu. Haque and Onoue reported lack of growth below 10 psu. However, Tomas reported growth at 5 psu. H. akashiwo that, within a salinity range from 20 to 40 psu, the maximum was obtained at 25 psu, while the lowest growth was attained at 40 psu. |
Habitat modifying ability potential (?) | Unknown Comments: Not available. |
Toxicity / Life stage (?) |
References: Tucker & Hargreaves (eds.) 2008. Environmental best management practices for aquaculture, Blackwell |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Seki, H., Suzuki, A., Iburi, Y. 2000. Biosorption of heavy metal ions to a marine microalga, Heterosigma akashiwo (Hada) Hada. Journal of colloid and interface science, 229(1), pp. 196-198. |
Known human health impact? | Not known Comments: There are no documented effects to humans from such blooms. |
Known economic impact? | Known References: Khan, S., Arakawa, O., Onoue, Y. 1997. Neurotoxins in a toxic red tide of Heterosigma akashiwo (Raphidophyceae) in Kagoshima Bay, Japan. Aquaculture Research, 28(1), pp. 9-14. Comments: Heterosigma akashiwo is a golden-brown unicellular phytoflagellate with a high potential to create harmful algal blooms (HABs) and kill fish in many coastal regions worldwide, resulting in significant economic losses. |
Known measurable environmental impact? | Known References: Mehdizadeh Allaf, M. 2023. Heterosigma akashiwo, a fish-killing flagellate. Microbiology Research, 14(1), pp. 132-147. Comments: Heterosigma forms massive golden tides that impact the survival of organisms at every trophic level. This alga has been shown to kill finfish, compromise fish and sea urchin egg development, and impact copepods, as well as oyster survival. |
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 References: Butrón, A., Orive, E., Madariaga, I. 2011. Potential risk of harmful algae transport by ballast waters: The case of Bilbao Harbour. Marine Pollution Bulletin, 62(4), pp. 747-757. |
Molecular information | Available NCBI (https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&id=2829&lvl=3&p=has_linkout&p=blast_url&p=genome_blast&lin=f&keep=1&srchmode=1&unlock) |
Created by | Romualda Chuševė, 2011-10-26 |
Last update by | Sandra Gečaitė, 2024-07-16 |