Bioaccumulation of zinc in the scleractinian coral Stylophora pistillata
Bioaccumulation of zinc in the scleractinian coral Stylophora pistillata
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DOI：
10.1007/s00338-005-0045-x
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发表时间：
2005-12-01
期刊：
影响因子：
3.5
通讯作者：
Boisson, F
中科院分区：
文献类型：
--
作者：
Ferrier-Pagès, C;Houlbrèque, F;Boisson, F
研究了光合作用和钙化作用所必需的营养元素锌（Zn）在藻体中的吸收动力学。pistillata表明，运输的Zn是由一个线性组件（扩散）在高浓度和活性载体介导的组件在低浓度。载体亲和力（K（m）=28 pmol l（-1））很低，表明珊瑚对海水中低浓度Zn有很好的适应性。锌在骨骼中的积累是线性的，其水平取决于孵育的长度以及外部浓度的溶解锌。也有一个光刺激的锌吸收，这表明虫黄藻，通过光合作用，参与了这一过程。在培养液中添加10 nM Zn显著提高了S.雌蕊这一结果表明，生活在贫营养沃茨的珊瑚可能受到锌等必需金属的限制。
The uptake kinetics of zinc (Zn), an essential nutrient for both photosynthesis and calcification, in the tissue of S. pistillata showed that the transport of Zn is composed of a linear component (diffusion) at high concentrations and an active carrier-mediated component at low concentrations. The carrier affinity (K (m)=28 pmol l(-1)) was very low, indicating a good adaptation of the corals to low levels of Zn in seawater. Zn accumulation in the skeleton was linear; its level was dependent on the length of the incubation as well as on the external concentration of dissolved Zn. There was also a light-stimulation of Zn uptake, suggesting that zooxanthellae, through photosynthesis, are involved in this process. An enrichment of the incubation medium with 10 nM Zn significantly increased the photosynthetic efficiency of S. pistillata. This result suggests that corals living in oligotrophic waters might be limited in essential metals, such as zinc.