The toxic dinoflagellate Alexandrium minutum impairs the performance of oyster embryos and larvae.

摘要: The dinoflagellate genus Alexandrium comprises species that produce highly potent neurotoxins known as paralytic shellfish toxins (PST), and bioactive extracellular compounds (BEC) of unknown structure ecological significance. toxic bloom-forming species, minutum, is distributed worldwide adversely affects many bivalves including the commercially ecologically important Pacific oyster, Crassostrea gigas. In France, recurrent A. minutum blooms can co-occur with C. gigas spawning larval development, may endanger recruitment population renewal. present study explores how oyster early development by exposing embryos larvae, under controlled laboratory conditions, to two strains producing only BEC or both PST BEC. Results highlight major role in toxicity upon development. strain caused lysis embryos, most sensitive stage among planktonic life stages. addition, non-PST-producing inhibited hatching, disrupted swimming behavior, feeding, growth, induced drastic decreases survival settlement umbonate eyed larvae (9 68 %, respectively). findings indicated accumulation (e.g. stages), possibly impairing response PST-producing strain. This work provides evidences could hamper shellfish.