English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The genus  Alexandrium  is one of the major harmful algal blooms (HABs)-forming dinoflagellate group and at least half of ~40 described species have been reported to produce paralytic shellfish toxins (PSTs). The potentially harmful species  Alexandrium insuetum  has been reported from many countries of Asia and Europe, and to have paralytic shellfish poisoning toxicity, but no mortality of marine animals was observed during its bloom. Therefore, it is ecologically important to characterize the possible toxicity and toxins of this organism. In this study, based on the establishment of two clonal cultures through cyst germination collected from the Yellow Sea, we identified  A. insuetum  from China as the first record  via  light microscopy (LM) and scanning electron microscopy (SEM) observations and phylogenetic analyses. The cultures of  A .  insuetum  were further observed to be toxic to finfish and zooplankton and deleterious to rotifer eggs  via  laboratory bioassays. The exposure bioassays using rotifer ( Brachionus plicatilis ), brine shrimp ( Artemia salina ), and larval finfish ( Oryzias melastigma ) demonstrated that  A .  insuetum  caused significant lethal effects on finfish and zooplankton species. Rotifer bioassays using cell-free culture medium, heat-treated cultures, and water, methanol, and trichloromethane extracts of algal cells revealed that  A .  insuetum  produced heat-labile, water-soluble toxin(s) that could be excreted from  A .  insuetum  cells and steadily accumulated in the medium during the growth phases. Hatching success of rotifer eggs was also found to be seriously affected by the exposure to  A .  insuetum . Importantly, ultra-high performance liquid chromatography-tandem mass spectrometry [UPLC (or LC)-MS-MS] analyses suggest the above-described toxicity of  A .  insuetum  was caused by neither PSTs nor spiroimines (13-desmethyl spirolide C and gymnodimine). Collectively, our findings demonstrated the novel toxicity to finfish and zooplankton in  A .  insuetum , which is ecologically important in not only possibly contributing to population dynamics and even the formation of HABs of the species, but also affecting the on-the-spot survival and the reproduction potency of marine animals. The present work is believed to set a cornerstone for the monitoring and risk assessment of the species along the coastal waters of China and for understanding the general ecology of  A .  insuetum .

frontiers in marine science

Novel Non-paralytic Shellfish Toxin and Non-spirolide Toxicity to Finfish, Brine Shrimp, and Rotifer Observed in a Culture of the Dinoflagellate Alexandrium insuetum Isolated From the Coastal Water of China