2018/11/30 by Huijiao Yang, Zhangxi Hu, Ning Xu +1 · 26 citations
Biochemistry, Genetics and Molecular Biology · Chemistry · Earth and Planetary Sciences · Environmental Science · #Allelopathy #Artemia salina #Biology #Botany #Chemistry #Dinoflagellate #Ecology #Germination #Marine Toxins and Detection Methods #Marine and coastal ecosystems #Protist diversity and phylogeny #Toxicity
paper · pdf · doi:10.1093/plankt/fby047
published in Journal of Plankton Research 41(1), 17-29 (Oxford University Press)
openalex publication_date 2018/11/30 · openalex created_date 2019/02/21 · openalex updated_date 2026/07/28
The dinoflagellate Karlodinium veneficum blooms kill fish by the production of karlotoxins. We investigated the allelopathy (Akashiwo sanguinea as the target species) and toxicity (Oryzias melastigma, Artemia salina and Brachionus plicatilis as test animals) of four strains of K. veneficum isolated from coastal waters of China and the USA to explore the ecological implications of allelopathy and toxicity. In general, all four strains of K. veneficum at high cell densities (>100 000 cells·mL−1) significantly inhibited the growth of A. sanguinea to different extents, but they exhibited either positive or negative allelopathy at lower densities. The toxicity of the four strains showed a decreasing order coinciding with their culture histories in the laboratory, suggesting K. veneficum may have gradually lost toxicity during laboratory culturing. The allelopathic and toxic potencies among K. veneficum strains were not perfectly parallel, indicating that either the allelochemicals and toxins of K. veneficum may be different chemicals, or the same chemicals functioned in different modes. Moreover, we found A. salina avoided feeding on more toxic strains. These results together suggest that toxins provide an advantage for K. veneficum via avoiding predation, but allelopathy may not play an important role in initiating blooms of K. veneficum.