GROWTH LIMITATION OF A COASTAL DIATOM BY LOW ZINC ION ACTIVITY
GROWTH LIMITATION OF A COASTAL DIATOM BY LOW ZINC ION ACTIVITY
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DOI：
10.1038/276070a0
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发表时间：
1978-01-01
期刊：
影响因子：
64.8
通讯作者：
GUILLARD, RRL
中科院分区：
文献类型：
--
作者：
ANDERSON, MA;MOREL, FMM;GUILLARD, RRL
据报道，未受污染的海洋沃茨中的总锌浓度在10 - 10 M范围内1。这种必需微量营养素的低浓度表明，某些浮游植物的生长可能受到锌的限制。在浮游植物生长所需的微量金属中，只有铁被认为是海洋环境中潜在的限制性微量营养素2，3。根据主要集中在铜的实验室工作，众所周知，微量金属的毒性取决于其化学形态，并可能与其游离离子活性有关4，5。然而，尚未明确确定某些金属的可用性也可能受其自由离子活性的控制，因此可能受到有机络合作用的抑制。在这里，我们报告的实验室实验表明，锌离子的活动（而不是总锌浓度）可以限制沿海海链藻weissflocerus（Grun. =T。fluviatalisHust.）并且如果发生锌的任何有机络合，则限制发生在未污染的海水中存在的锌离子活性。
THE total zinc concentration in unpolluted marine waters has been reported to be in the 10−10M range1. Such low concentration of an essential micronutrient suggests that the growth of some phytoplankton may be zinc limited. Of the trace metals necessary for phytoplankton growth, only iron has been considered a potential limiting micronutrient in the marine environment2,3. On the basis of laboratory work which focused mostly on copper, it is well known that the toxicity of a trace metal depends on its chemical speciation and can be related uniquely to its free ion activity4,5. However, it has not been established unequivocally that the availability of some metals may also be controlled by their free ion activities and may thus be depressed by organic complexation. Here we report laboratory experiments demonstrating that the zinc ion activity (rather than the total zinc concentration) can limit the growth rate of a coastal diatomThalassiosira weissflogii(Grun. =T. fluviatalisHust.) and that the limitation occurs at zinc ion activities which would be present in unpolluted seawater if any organic complexation of zinc were taking place.