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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effects of carbonic anhydrase inhibition on biomass and primary production of estuarine benthic microalgal communities
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Effects of carbonic anhydrase inhibition on biomass and primary production of estuarine benthic microalgal communities

机译：碳酸酐酶抑制对河口底栖微藻群生物量和初次生产的影响

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Recent studies have focused on carbon concentrating mechanisms and the associated enzyme, carbonic anhydrase, to better understand the efficiency of CO2 uptake rates and carbon fixation in photoautotrophs. Some benthic microalgae (BMA) may be limited by inorganic carbon availability because high photosynthetic rates withdraw a large amount of CO2 and HCO3- in the top layer of sediment. Investigating the mechanisms that affect carbon acquisition are necessary if we are to fully understand the functioning and structuring processes of these systems. From this, we can better predict the potential impacts of increasing atmospheric CO2 concentrations on BMA communities. The purpose of this research was to examine a carbon concentrating mechanism used by BMA through their responses to induced carbon limitation. This approach was conducted through the removal of carbonic anhydrase (CA) activity using an inhibitor, ethoxyzolamide. Microcosm experiments were performed on intertidal muddy sediments from North Inlet Estuary, SC. Exposure to ethoxyzolamide resulted in a reduction of gross primary productivity (GPP) without a reduction in total BMA biomass. Furthermore, removed CA activity caused BMA cumulative GPP maxima to shift upward toward the surface in the sediment column. Active CA was necessary to maintain high GPP rates in these communities and allowed motile BMA to use a wider portion of the sediment column. Available HCO3- at lower depths could still be dehydrated into CO2 by microalgae with CA. Changes in global atmospheric CO2 concentrations leading to higher CO2 availability at the atmosphere-sediment interface may alter the structure and function of these BMA systems, and the vertical distribution of GPP. These consequences may have important implications for the biogeochemical cycling occurring in estuaries.
机译：最近的研究专注于碳浓缩机制和相关酶，碳酸酐酶，以更好地了解光学萎缩中CO2吸收率和碳固定的效率。一些底栖微藻（BMA）可以受到无机碳的限制，因为高光合速率在沉积物顶层中取出大量的CO 2和HCO3-。调查影响碳获取的机制是必要的，如果我们完全理解这些系统的功能和结构化过程。由此，我们可以更好地预测增加大气CO2浓度对BMA社区的潜在影响。本研究的目的是通过对诱导碳限制的反应来检查BMA使用的碳浓缩机制。通过使用抑制剂，乙氧基唑胺去除碳酸酐酶（CA）活性来进行这种方法。对北入口河口河口跨境泥质沉积物进行微观微观实验。暴露于乙氧基齐氧酰胺导致初级生产率（GPP）的降低而不会降低总BMA生物质。此外，除去Ca活动使BMA累积GPP最大值朝向沉积物柱中的表面向上移动。有源CA是在这些社区中维持高GPP速率的必要条件，并允许动机BMA使用沉积物柱的更宽部分。 HCO3-在较低深度下仍然可以通过微藻与CA将CO2脱水。在大气沉积物界面处导致全局大气CO2浓度的变化导致高于CO2可用性，可以改变这些BMA系统的结构和功能，以及GPP的垂直分布。这些后果可能对河口中发生的生物地良化循环具有重要意义。

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