Iron, silicate, and light co-limitation of three Southern Ocean diatom species
Iron, silicate, and light co-limitation of three Southern Ocean diatom species
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DOI：
10.1007/s00300-008-0448-6
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发表时间：
2008-08-01
期刊：
影响因子：
1.7
通讯作者：
Lochte, K.
中科院分区：
文献类型：
--
作者：
Hoffmann, L. J.;Peeken, I.;Lochte, K.
结合铁，硅酸盐，和光的共同限制的效果进行了研究，在三个硅藻物种Actinocyclus sp. Escherberg，角毛藻dichaeta Escherberg，和角毛藻debilis Cleve，分离自南大洋（SO）。所有物种的生长都受到铁和硅酸盐的共同限制，反映在与对照相比细胞分裂数量的显著增加。在铁和硅酸盐共同限制下，C. dichaeta，而硅的限制，一般引起细胞伸长角毛藻种。类似于SO表面条件的较高光强对C. dichaeta和Actinocyclus sp.对C.虚弱这与假设的SO硅藻由于深风驱动混合的光限制相反。我们的研究结果表明，南大洋硅藻的生长和物种组成的非生物因素，铁，硅酸盐和光的敏感的相互作用的影响。
The effect of combined iron, silicate, and light co-limitation was investigated in the three diatom species Actinocyclus sp. Ehrenberg, Chaetoceros dichaeta Ehrenberg, and Chaetoceros debilis Cleve, isolated from the Southern Ocean (SO). Growth of all species was co-limited by iron and silicate, reflected in a significant increase in the number of cell divisions compared to the control. Lowest relative Si uptake and drastic frustule malformation was found under iron and silicate co-limitation in C. dichaeta, while Si limitation in general caused cell elongation in both Chaetoceros species. Higher light intensities similar to SO surface conditions showed a negative impact on growth of C. dichaeta and Actinocyclus sp. and no effect on C. debilis. This is in contrast to the assumed light limitation of SO diatoms due to deep wind driven mixing. Our results suggest that growth and species composition of Southern Ocean diatoms is influenced by a sensitive interaction of the abiotic factors, iron, silicate, and light.