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首页> 外文期刊>Environmental Science & Technology >Dynamic Selenium Assimilation, Distribution, Efflux, and Maternal Transfer in Japanese Medaka Fed a Diet of Se-enriched Mayflies
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Dynamic Selenium Assimilation, Distribution, Efflux, and Maternal Transfer in Japanese Medaka Fed a Diet of Se-enriched Mayflies

机译：动态的硒同化，分布，外排和母体转移在日本Medaka喂养富硒五味子的饮食。

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摘要

Selenium (Se) trafficking in oviparous species remains understudied and a major source of uncertainty in developing sound Se regulations. Here, we utilized ~(75)Se to follow Se through a simulated natural food chain (water, periphyton, mayflies (Centroptilum triangulifer), fish (Japanese medaka)). We specifically examined Se assimilation efficiency, tissue distribution, efflux rate, and maternal transfer in medaka. Selenium assimilation efficiency (AE) averaged 63.2 ± 8.8% from mayfly diets and was not affected by mayfly [Se] across a dietary range of 5.6-38.7 μg g~(-1) (dry wt). However, AE decreased significantly as mayfly larva size increased. Efflux rate constants (k_e) were consistent between reproductively inactive (0.066 d~(-1)) and spawning females (0.069 d~(-1)). Total Se loss rate constant (K_(e+egg); efflux and egg deposition) was 0.17 d~(-1) in spawning females. Interestingly, medaka appeared to rapidly shuttle Se to their eggs directly from their diet via the ovary, as opposed to mobilization from surrounding tissues, resulting in dynamic egg [Se] that was more attributable to recent dietary Se ingestion than female whole body [Se] in this asynchronous spawning fish. Spawning strategy likely plays a large role in the process of fish egg Se deposition and requires further attention to understand risk and toxicity of Se to fish.
机译：卵子物种中硒的运输仍未得到充分研究，这是制定健全的硒法规的主要不确定性来源。在这里，我们利用〜（75）Se通过模拟的天然食物链（水，水生植物，may（Centroptilum triangulifer），鱼（日本））跟踪Se。我们专门研究了aka中硒的吸收效率，组织分布，外排率和母体转移。 may日粮中硒的同化效率（AE）平均为63.2±8.8％，在5.6-38.7μgg〜（-1）（干重）的日粮范围内不受may [Se]的影响。然而，随着may蝇幼虫大小的增加，AE显着降低。生殖不活跃（0.066 d〜（-1））和产卵雌性（0.069 d〜（-1））的外向速率常数（k_e）一致。产卵雌性的总硒损失率常数（K_（e + egg）；外排和卵沉积）为0.17 d〜（-1）。有趣的是，青aka似乎从饮食中直接通过卵巢直接将硒转运到它们的卵中，而不是从周围组织中转移出来，从而导致动态卵[Se]比女性整个身体[Se]归因于近期饮食中的硒摄入在这种异步产卵鱼中。产卵策略可能在鱼卵中硒的沉积过程中起着重要作用，需要进一步关注以了解硒对鱼类的风险和毒性。

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  • 来源
    《Environmental Science & Technology》 |2014年第5期|2971-2978|共8页
  • 作者

    Justin M. Conley; AtLee T. D. Watson; Lingtian Xie; David B. Buchwalter;

  • 作者单位

    Environmental and Molecular Toxicology Program, Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina 27695, United States;

    Environmental and Molecular Toxicology Program, Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina 27695, United States;

    Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;

    Environmental and Molecular Toxicology Program, Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina 27695, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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