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首页> 外文期刊>Marine ecology progress series >Production and consumption of extracellular polymeric substances in an intertidal diatom mat
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Production and consumption of extracellular polymeric substances in an intertidal diatom mat

机译：潮间硅藻垫中细胞外聚合物的生产和消费

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摘要

We investigated seasonal changes in the production of extracellular polymeric substances (EPS) and short-chain organic acids (SCOA) exuded by benthic diatoms, and the use of these exudates as a carbon source by heterotrophic bacteria. An in situ C-13 pulse-chase method was used to follow the fate of EPS for 5 consecutive days. These experiments were done at 2 mo intervals for 1 yr. The EPS were recovered from the sediment as 2 operationally defined fractions (i.e. water-extractable and EDTA-extractable EPS). Seasonal differences in EPS production correlated to light intensity and temperature. From February until June the biomass and production of diatoms and bacteria were closely coupled. It was concluded that SCOA were the most important substrates for the bacteria. Sulfate-reducing bacteria (SRB) in particular benefited from SCOA released by diatoms. From August on, the coupling of biomass and production of diatoms and bacteria weakened and was almost lost in December. During the period from August to December, EPS produced by diatoms promoted the growth of other bacterial taxa rather than SRB, and the production of SCOA was low. Thus, it appears that the seasonal variation in exudates produced by diatoms plays an important role in shaping community composition and maintaining the diversity of the associated bacteria.
机译：我们调查了底栖硅藻渗出的细胞外聚合物（EPS）和短链有机酸（SCOA）生产的季节性变化，以及这些渗出液作为异养细菌作为碳源的用途。采用原位C-13脉冲追踪方法连续5天追踪EPS的命运。这些实验以2 mo的间隔进行了1年。从沉积物中回收的EPS分为两个可操作定义的馏分（即水可提取和EDTA可提取的EPS）。 EPS产量的季节性差异与光强度和温度有关。从2月到6月，硅藻和细菌的生物量与产量紧密耦合。结论是SCOA是细菌的最重要底物。硫酸盐还原细菌（SRB）特别受益于硅藻释放的SCOA。从8月开始，生物量与硅藻和细菌产量的耦合减弱，并在12月几乎消失。在8月至12月期间，硅藻产生的EPS促进了其他细菌类群而不是SRB的生长，并且SCOA的产生较低。因此，看来硅藻产生的分泌物的季节变化在塑造群落组成和维持相关细菌的多样性方面起着重要作用。

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