Effects of coral reef benthic primary producers on dissolved organic carbon and microbial activity.
Effects of coral reef benthic primary producers on dissolved organic carbon and microbial activity.
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珊瑚礁底栖初级生产者对溶解有机碳和微生物活性的影响。
DOI：
10.1371/journal.pone.0027973
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Smith JE
中科院分区：
文献类型：
--
作者：
Haas AF;Nelson CE;Wegley Kelly L;Carlson CA;Rohwer F;Leichter JJ;Wyatt A;Smith JE
海洋生态系统中的底栖初级生产者可显著改变其周围环境中的生物地球化学循环和微生物过程。为了研究这些相互作用，我们研究了溶解的有机物释放的优势底栖生物类群和随后的微生物生物化的穆雷阿，法属波利尼西亚泻湖礁。光合作用，呼吸作用，溶解有机碳（DOC）的释放率进行了评估几个常见的底栖生物礁生物从backreef栖息地。我们评估了微生物群落对每个底栖生产者溶解分泌物的反应，通过测量浮游细菌的生长，呼吸和DOC下降在两天的黑暗稀释培养孵育。对六种底栖生产者进行了实验：三种大型藻类（每种代表不同的藻类门：装饰螺藻- Ochrophyta;红柄鹅膏菌-红藻门;仙人掌仙掌藻-绿藻门）、一种草坪藻类混合组合、一种甲壳珊瑚藻（水石藻）和一种占优势的造礁石珊瑚（裂叶滨珊瑚）。我们的研究结果表明，所有五种类型的藻类，但不是珊瑚，分泌大量的不稳定DOC到周围环境中。总体而言，光合速率最高的初级生产者释放的DOC最多，浮游细菌的生长量也最大;草坪藻类产生的DOC每单位表面积几乎是其他底栖生产者的两倍（14.0±2.8 µmol h−1 dm−2），刺激浮游细菌快速生长（0.044±0.002 log 10 cells h−1）和伴随的氧气下降（0.16±0.05 µmol L−1 h−1 dm−2）。我们的研究结果表明，底栖礁藻可以释放的光合固定碳的DOC的显着部分，这些释放速率因物种而异，这种DOC是可利用的，并消耗礁相关的微生物。这些数据提供了令人信服的证据，表明底栖初级生产者对珊瑚礁微生物动力学和生物地球化学参数（即，DOC和氧的可用性，细菌丰度和代谢）的珊瑚礁社区。
Benthic primary producers in marine ecosystems may significantly alter biogeochemical cycling and microbial processes in their surrounding environment. To examine these interactions, we studied dissolved organic matter release by dominant benthic taxa and subsequent microbial remineralization in the lagoonal reefs of Moorea, French Polynesia. Rates of photosynthesis, respiration, and dissolved organic carbon (DOC) release were assessed for several common benthic reef organisms from the backreef habitat. We assessed microbial community response to dissolved exudates of each benthic producer by measuring bacterioplankton growth, respiration, and DOC drawdown in two-day dark dilution culture incubations. Experiments were conducted for six benthic producers: three species of macroalgae (each representing a different algal phylum: Turbinaria ornata – Ochrophyta; Amansia rhodantha – Rhodophyta; Halimeda opuntia – Chlorophyta), a mixed assemblage of turf algae, a species of crustose coralline algae (Hydrolithon reinboldii) and a dominant hermatypic coral (Porites lobata). Our results show that all five types of algae, but not the coral, exuded significant amounts of labile DOC into their surrounding environment. In general, primary producers with the highest rates of photosynthesis released the most DOC and yielded the greatest bacterioplankton growth; turf algae produced nearly twice as much DOC per unit surface area than the other benthic producers (14.0±2.8 µmol h−1 dm−2), stimulating rapid bacterioplankton growth (0.044±0.002 log10 cells h−1) and concomitant oxygen drawdown (0.16±0.05 µmol L−1 h−1 dm−2). Our results demonstrate that benthic reef algae can release a significant fraction of their photosynthetically-fixed carbon as DOC, these release rates vary by species, and this DOC is available to and consumed by reef associated microbes. These data provide compelling evidence that benthic primary producers differentially influence reef microbial dynamics and biogeochemical parameters (i.e., DOC and oxygen availability, bacterial abundance and metabolism) in coral reef communities.
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影响因子：
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