Australian Institute of Marine Science, P.M.B. No. 3, 4810, Townsville, M.C., Queensland, Australia.
Microb Ecol. 1988 Jan;15(1):59-79. doi: 10.1007/BF02012952.
Bacterial productivity ((3)H-thymidine incorporation into DNA) and intertidal microbenthic communities were examined within five mangrove estuaries along the tropical northeastern coast of Australia. Bacteria in mangrove surface sediments (0-2 cm depth) were enumerated by epifluorescence microscopy and were more abundant (mean and range: 1.1(0.02-3.6)×10(11) cells·g DW(-1)) and productive (mean: 1.6 gC·m(-2)· d(-1)) compared to bacterial populations in most other benthic environments. Specific growth rates (¯x=1.1) ranged from 0.2-5.5 d(-1), with highest rates of growth in austral spring and summer. Highest bacterial numbers occurred in winter (June-August) in estuaries along the Cape York peninsula north of Hinchinbrook Island and were significantly different among intertidal zones and estuaries. Protozoa (10(5)-10(6)·m(-2), pheopigments (0.0-24.1μg·gDW(-1)) and bacterial productivity (0.2-5.1 gC·m(-2)·d(-1)) exhibited significant seasonality with maximum densities and production in austral spring and summer. Algal biomass (chlorophylla) was low (mean: 1.6μg·gDW(-1)) compared to other intertidal sediments because of low light intensity under the dense forest canopy, especially in the mid-intertidal zone. Partial correlation analysis and a study of possible tidal effects suggest that microbial biomass and bacterial growth in tropical intertidal sediments are regulated primarily by physicochemical factors and by tidal flushing and exposure. High microbial biomass and very high rates of bacterial productivity coupled with low densities of meiofaunal and macroinfaunal consumers observed in earlier studies suggest that microbes may be a sink for carbon in intertidal sediments of tropical mangrove estuaries.
在澳大利亚东北部热带沿海水域的五个红树林河口，我们研究了细菌生产力（（3）H-胸腺嘧啶掺入 DNA）和潮间带底栖微生物群落。通过荧光显微镜对红树林表层沉积物（0-2cm 深度）中的细菌进行计数，发现其丰度（平均值和范围：1.1(0.02-3.6)×10(11) 细胞·g DW(-1))和生产力（平均值：1.6 gC·m(-2)· d(-1))均高于大多数其他底栖环境中的细菌种群。特定生长率（¯x=1.1）范围为 0.2-5.5 d(-1)，在澳大利亚春季和夏季生长速度最高。在豪勋爵岛北部的约克角半岛沿岸的河口，细菌数量最高的是冬季（6-8 月），并且在潮间带和河口之间存在显著差异。原生动物（10(5)-10(6)·m(-2)、叶绿素（pheopigments）（0.0-24.1μg·gDW(-1))和细菌生产力（0.2-5.1 gC·m(-2)·d(-1))表现出明显的季节性，最大密度和生产力出现在澳大利亚春季和夏季。藻类生物量（叶绿素 a）较低（平均值：1.6μg·gDW(-1))，这是因为在茂密的森林树冠下光照强度较低，特别是在中潮带。偏相关分析和对潮汐可能影响的研究表明，热带潮间带沉积物中的微生物生物量和细菌生长主要受到理化因素以及潮汐冲刷和暴露的调节。在早期研究中观察到的微生物生物量高和细菌生产力非常高，以及小型和大型消费者的密度低，表明微生物可能是热带红树林河口潮间带沉积物中碳的汇。
