Cyanobacteria are biogeochemically significant constituents of coral reef ecosystems; however, little is known about biotic and abiotic factors influencing the abundance and composition of cyanobacterial communities in fringing coral reef waters. To understand the patterns of cyanobacterial biogeography in relation to coastal environmental factors, we examined the diversity of planktonic and benthic cyanobacteria at 12 sites along the west coast of Hawaii's Big Island. We found distinct cyanobacterial communities in sediments compared to the water column. In both sediments and water, community structure was strongly related to overall biomass (chlorophyll a concentration), although both these communities corresponded to different sets of biotic/abiotic variables. To examine the influence of freshwater input on planktonic cyanobacterial communities, we conducted a mesocosm experiment where seawater was amended with freshwater from two sources representing high- and low-human population influence. Planktonic cyanobacterial abundance decreased over time in mesocosms, although chlorophyll a concentration significantly increased with time, indicating cyanobacteria were likely outcompeted by other phytoplankton in incubations. Our results show that cyanobacterial community structure may be affected by runoff from terrestrial habitats, but that the composition of cyanobacterial communities inhabiting these locations is also structured by factors not measured in this study.

译文

:蓝细菌是珊瑚礁生态系统的生物地球化学重要组成部分;然而,关于在珊瑚礁边缘水域影响蓝藻群落数量和组成的生物和非生物因素知之甚少。为了了解与沿海环境因素相关的蓝细菌生物地理格局,我们检查了夏威夷大岛西海岸12个地点的浮游和底栖蓝细菌的多样性。与水柱相比,我们在沉积物中发现了独特的蓝细菌群落。在沉积物和水中,群落结构都与总生物量(叶绿素a浓度)密切相关,尽管这两个群落对应于不同的生物/非生物变量集。为了检验淡水输入对浮游蓝藻群落的影响,我们进行了中观实验,其中海水被来自代表高人口和低人口影响的两个来源的淡水修正。尽管中叶的浮游藻类蓝细菌丰度随着时间的推移而降低,但是叶绿素a的浓度随时间显着增加,这表明在孵化中蓝藻细菌的竞争能力可能超过其他浮游植物。我们的结果表明,蓝细菌群落结构可能受到陆地生境径流的影响,但是居住在这些位置的蓝细菌群落的组成也受到本研究中未测量的因素的影响。

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