Saxitoxin exposure in an endangered fish: association of a shortnose sturgeon mortality event with a harmful algal bloom

Marine Ecology Progress Series

Zhihong Wang¹  Anne Lichtenwalner¹  Deborah Bouchard¹  Darcie Couture¹  Trey Knott¹  Jessica Pruden¹  Spencer E. Fire¹  Marie-Yasmine Dechraoui Bottein¹  Bennie L. Haynes¹  Gail Wippelhauser¹ 

关键词: Saxitoxin;    Sturgeon;    Harmful algal bloom;    Paralytic shellfish toxin;    HAB;    Acipenser brevirostrum;    Maine;   

DOI  :  10.3354/meps09768

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: Saxitoxin (STX)-producing blooms of the toxic dinoflagellate genus Alexandrium have been responsible for devastating ecosystem-wide impacts in coastal waters of the northeastern USA. In the summer of 2009, a severe Alexandrium bloom in New England coastal waters co-occurred with a shortnose sturgeon Acipenser brevirostrum mortality event in Sagadahoc Bay, Maine, USA. Thirteen individuals of this endangered fish species were found dead on 10 July 2009, and this die-off was associated with extremely high Alexandrium cell densities, record-breaking toxin burdens (>80000 ng g⁻¹) in shellfish, and closures of shellfish beds affecting nearly the entire Maine coastline. STX-like activity was detected in sturgeon (n = 3) stomach contents and liver and gill tissues via neuroblastoma assay and receptor-binding assay at concentrations ranging between 37 and 2300 ng STX-eq. g⁻¹ (STX equivalents per gram sample). Stomach content analyses of the 3 necropsied sturgeon carcasses showed a large number of amethyst gem clams Gemma gemma. Liquid chromatography-mass spectrometry confirmed the presence of STX and related congeners in sturgeon stomach contents, at concentrations between 311 and 743 ng g⁻¹. The present study marks the first reported detection of STXs in shortnose sturgeon, and provides evidence of trophic transfer of Alexandrium toxins as a potential cause of mortality in this event, as well as a threat to the health of this endangered population of fish.

【 授权许可】

Unknown