Silicon uptake by sponges: a twist to understanding nutrient cycling on continental margins
Silicon uptake by sponges: a twist to understanding nutrient cycling on continental margins
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海绵对硅的吸收：理解大陆边缘养分循环的一个转折点
DOI：
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发表时间：
2011
影响因子：
4.6
通讯作者：
Isabel Vaquerizo
中科院分区：
文献类型：
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作者：
M. Maldonado;L. Navarro;A. Grasa;Alicia González;Isabel Vaquerizo
大约75%的现存海绵物种使用溶解硅（DSi）来构建硅质骨架。我们发现，硅（Si）的吸收亚沿海Axinella demosponges酶动力学。有趣的是，最大的吸收效率发生在实验DSi浓度两个数量级高于海绵栖息地，是无法实现的现代海洋沿海沃茨。这种吸收性能似乎植根于以前的条件，适合于在表面上高DSi值的特点前第三纪（>65百万年）的栖息地，这种海绵谱系多样化。祖先吸收系统的持久性导致海绵被更有效地吸收硅藻在低环境DSi水平表征最近的海洋竞争。然而，我们表明，亚沿海海绵消耗大量的沿海DSi（0.01-0.90 mmol Si m-2天-1）的初级生产电路的费用。 对这种消耗的忽视阻碍了对大陆边缘硅循环的准确理解。
About 75% of extant sponge species use dissolved silicon (DSi) to build a siliceous skeleton. We show that silicon (Si) uptake by sublittoral Axinella demosponges follows an enzymatic kinetics. Interestingly, maximum uptake efficiency occurs at experimental DSi concentrations two orders of magnitude higher than those in the sponge habitats, being unachievable in coastal waters of modern oceans. Such uptake performance appears to be rooted in a former condition suitable to operate at the seemingly high DSi values characterizing the pre-Tertiary (>65 mya) habitats where this sponge lineage diversified. Persistence of ancestral uptake systems causes sponges to be outcompeted by the more efficient uptake of diatoms at the low ambient DSi levels characterizing Recent oceans. Yet, we show that sublittoral sponges consume substantial coastal DSi (0.01–0.90 mmol Si m−2 day−1) at the expenses of the primary-production circuit. Neglect of that consumption hampers accurate understanding of Si cycling on continental margins.
影响因子：
1.6
作者：
Hendry, Katharine R.;Leng, Melanie J.;Halliday, Alex N.
通讯作者：
Halliday, Alex N.
影响因子：
4.1
作者：
Schröder, HC;Perovic-Ottstadt, S;Müller, WEG
通讯作者：
Müller, WEG