In recent years, marine bivalves cultured in the natural environment have been confirmed to accumulate diarrhetic shellfish toxins (DSTs) from the aqueous phase. To investigate the effects of varying seston concentrations on DST accumulation, mussels (Mytilus galloprovincialis) were exposed to comparable concentrations of okadaic acid (OA) and dinophysistoxin-1 (DTX1) in 0.45-μm filtered seawater spiked with varying concentrations of ambient suspended particles at 0, 10, 30, 60, 90, and 120 mg L⁻¹, for 96 h. Effects of seston additions on the mussels’ feeding on nontoxic microalgae, Isochrysis galbana, the stability of dissolved toxins and the anatomical compartmentalization of toxins were also assessed. Results showed that mussels more readily accumulated OA than DTX1 from the aqueous phase. Three potential mechanisms of the effects of seston on toxin accumulation were identified. First, seston at low concentrations (10 mg L⁻¹) adsorbed toxins and thus promoted toxin accumulation. Second, seston enhanced the degradation of aqueous OA and DTX1, and possibly reduced the adsorption by digestive gland (DG) cells through simple diffusion due to competitive adsorption. Third, the clearance rate of mussels was significantly reduced at high seston concentrations (120 mg L⁻¹). The esterification of DSTs was maximized in DG tissue, although a high percentage (52%) of DSTs was distributed in non-visceral tissues of mussels exposed to aqueous toxins. This study suggests that the risk of benthic DST-producing microalgae to marine cultured shellfish should be taken into consideration, even in the absence of a bloom of toxic microalgae in the water column.

近年来，已经证实在自然环境中培养的海洋双壳类动物会从水相中积聚腹泻性贝类毒素（DST）。为了研究不同浓度的活塞对DST积累的影响，将贻贝（Mytilus galloprovincialis）暴露于0.45μm过滤海水中的冈田酸（OA）和dinophysistoxin-1（DTX1）的相当浓度下，掺入浓度不同的环境悬浮颗粒0、10、30、60、90和120 mg L ^-1，持续96 h。在无毒的微藻在蚌喂养浮游物增加的影响，等鞭金藻，还评估了溶解毒素的稳定性和毒素的解剖学分区。结果显示，贻贝比水相中的DTX1更容易积聚OA。鉴定了三种可能的影响毒素积累的机制。首先，低浓度（10 mg L ^-1）的硒吸附毒素，从而促进了毒素的积累。其次，seston促进了OA和DTX1水溶液的降解，并可能由于竞争性吸附而通过简单扩散而减少了消化腺（DG）细胞的吸附。第三，在高浓度（120 mg L ^{-1）的情况下}，贻贝的清除率显着降低。）。DSTs的酯化作用在DG组织中达到最大，尽管DSTs的高百分比（52％）分布在暴露于含水毒素的贻贝的非内脏组织中。这项研究表明，即使在水柱中没有大量有毒微藻繁殖的情况下，也应考虑到产生底栖DST的微藻对海水养殖贝类的风险。