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首页> 外文期刊>Marine biology >Time-course uptake and elimination of benzo(a)pyrene and its damage to reproduction and ensuing reproductive outputs of Pacific oyster, Crassostrea gigas
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Time-course uptake and elimination of benzo(a)pyrene and its damage to reproduction and ensuing reproductive outputs of Pacific oyster, Crassostrea gigas

机译：太平洋牡蛎（Crassostrea gigas）的时程吸收和消除苯并（a）to及其对生殖和随后生殖输出的损害

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摘要

The time-course of uptake and elimination of benzo(a)pyrene (BaP) for the Pacific oyster, Crassostrea gigas and reproduction damage and reproductive outputs were studied. Sexually immature C. gigas broodstock were fed for 28 days with live algae grown in four BaP solutions of 0, 50, 500, and 5,000 μg L~(-1) (hereafter, control, 50, 500, and 5,000 oysters) and were subsequently conditioned to maturation by a feeding with BaP-free live algae under temperature manipulation for another 28 days. The 5,000 μg L~(-1) oysters gained a steady state concentration, around 30,000 ng L~(-1) d.w. for digestive gland, a week earlier compared to the 500 μg L~(-1) oysters. The earlier gain or longer persistence of the steady state concentration influenced elimination of BaP, with an eliminating trend for 500 μg L~(-1) oysters, while no elimination for 5,000μg L~(-1) oysters. The maternal persistence of the steady state concentration resulted in significant dam- ages in the reproductive success and their reproductive outputs in terms of the hatching rate and larval growth, survival, and settlement. The 50 μg L~(-1) oysters remained far below the steady state concentration, and showed a manifest eliminating behavior during the subsequent BaP-free 28 day maturation period. The reproductive success and initial larval events of 50 μg L~(-1) oysters were comparable to those of control. However, the damage potential of the 50 μg L~(-1) oysters might be more significant if their maternal exposure continued beyond 28 days, since the accumulation profile at this dose was linear.
机译：研究了太平洋牡蛎，Crassostrea gigas摄取和消除苯并（a）re（BaP）的时间过程以及繁殖损害和生殖输出。将性未成熟的C. gigas亲鱼喂食生长在四种BaP溶液中的活藻类28天，该溶液分别为0、50、500和5,000μgL〜（-1）（此后为对照，50、500和5,000牡蛎），随后在温度控制下，通过饲喂无BaP的活藻使其适应成熟状态，持续另外28天。 5,000μgL〜（-1）牡蛎的稳态浓度约为30,000 ng L〜（-1）d.w.。对于消化腺，比500μgL〜（-1）的牡蛎要早一周。稳态浓度的较早增加或持续时间更长，影响了BaP的消除，对500μgL〜（-1）牡蛎有消除的趋势，而对5000μgL〜（-1）牡蛎没有消除的趋势。孕产妇对稳态浓度的持续存在导致孵化率和幼虫生长，存活和定居方面的生殖成功及其生殖产出受到重大损害。 50μgL〜（-1）牡蛎仍远低于稳态浓度，并且在随后的无BaP 28天成熟期表现出明显的消除行为。 50μgL〜（-1）牡蛎的繁殖成功率和初始幼虫事件与对照组相当。但是，如果母体暴露持续超过28天，则50μgL〜（-1）牡蛎的破坏潜力可能会更大，因为在此剂量下的积累曲线是线性的。

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