The distribution of the two potentially toxic dinoflagellates Gymnodinium catenatum and Alexandrium spp. was investigated in the Mediterranean Moroccan Sea from March 2018 to March 2019. The cockle Acanthocardia tuberculata and the smooth clam Callista chione were collected at four stations, and their toxin levels were assessed using the mouse bioassay. The toxin profile was analysed by LC-MS/MS in G. catenatum and in the bivalves harvested in M'diq and Djawn. The species G. catenatum was present throughout the year, whereas Alexandrium spp. was less abundant. The paralytic shellfish toxin (PST) level in cockles was, on average, six times above the sanitary threshold; GTX5 was the major contributor to the total PST level, followed by dc-STX and STX. The toxin level of the smooth clam was considerably lower than that of the cockle; GTX5 and C-toxins were the dominating analogues. Our results suggest the responsibility of G. catenatum for the recurrent PST contamination in the Moroccan Mediterranean Sea, with a west-east gradient.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.marpolbul.2022.114349 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Elevated pCO may increase the edible safety risk of clams exposed to toxic Alexandrium spp.
Sci Total Environ
December 2024
Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources of the People's Republic of China, Laoshan District, Qingdao City, Shandong, China; Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, No. 168, Wenhaizhong Road, Jimo District, Qingdao City, Shandong, China. Electronic address:
Article Synopsis
- Toxic algal blooms can harm fish and make seafood unsafe to eat.
- A study found that high carbon dioxide levels in the ocean make certain toxic algae grow more and produce different amounts of dangerous toxins.
- These toxic substances build up in clams, making it harder for them to get rid of the toxins, which could mean clams are more dangerous to eat in the future.
Toxic effects of the emerging Alexandrium pseudogonyaulax (Dinophyceae) on multiple trophic levels of the pelagic food web.
Harmful Algae
September 2024
Section Shelf Sea Ecology, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Helgoland, Germany.
The dinoflagellate Alexandrium pseudogonyaulax, a harmful algal bloom species, is currently appearing in increasing frequency and abundance across Northern European waters, displacing other Alexandrium species. This mixotrophic alga produces goniodomins (GDs) and bioactive extracellular substances (BECs) that may pose a threat to coastal ecosystems and other marine resources. This study demonstrated the adverse effects of A.
View Article and Find Full Text PDFGrazing impact of the calanoid copepods spp. on the toxic dinoflagellate in the western coastal waters of Korea.
Front Microbiol
June 2024
Department of Ocenogaphy, College of Ocean Sciences, Kunsan National University, Kunsan, Republic of Korea.
Marine dinoflagellate species in the genus are well known to produce paralytic shellfish poison as well as common coastal species with cosmopolitan distribution. However, few studies on the feeding of copepods on species have been conducted. The toxic dinoflagellate contains goniodomin A and causes red tides in many countries.
View Article and Find Full Text PDFImmune and physiological responses of Mytilus unguiculatus to Alexandrium spp. with varying paralytic shellfish toxin profiles.
Sci Total Environ
July 2024
Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture; Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China; State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China. Electronic address:
The innate immunity of bivalves serves as the initial defense mechanism against environmental pollutants, ultimately impacting genetic regulatory networks through synergistic interactions. Previous research has demonstrated variations in the accumulation and tolerance capacities of bivalves; however, the specific mechanism underlying the low accumulation of PSTs in M. unguiculatus remains unclear.
View Article and Find Full Text PDFPolyphyletic origin of saxitoxin biosynthesis genes in the marine dinoflagellate Alexandrium revealed by comparative transcriptomics.
Harmful Algae
April 2024
Department of Life Science, Sangmyung University, Seoul 03016, South Korea. Electronic address:
Article Synopsis
- The study investigates the gene sequences involved in saxitoxin (STX) production in both toxic and non-toxic species of the dinoflagellate Alexandrium.
- Comparative analysis shows that toxic species have a higher similarity in the genes responsible for STX production, while non-toxic species appear to have lost key genes associated with toxicity.
- Phylogenetic analysis indicates that toxic Alexandrium may have acquired its STX genes through horizontal gene transfer from toxic cyanobacteria, suggesting a complex evolutionary history.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!