Phytoplankton community structure and productivity in relation to the hydrological regime of the Gulf of Carpentaria, Australia, in summer
Phytoplankton community structure and productivity in relation to the hydrological regime of the Gulf of Carpentaria, Australia, in summer
复制标题
澳大利亚卡奔塔利亚湾夏季浮游植物群落结构和生产力与水文状况的关系
DOI：
10.1071/mf9940265
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发表时间：
1994
影响因子：
1.8
通讯作者：
D. Vaudrey
中科院分区：
文献类型：
--
作者：
P. Rothlisberg;P. Pollard;P. Nichols;D. Moriarty;A. M. G. Forbes;C. Jackson;D. Vaudrey
为了描述水文对卡奔塔利亚湾浮游植物群落的影响，在生产力、生物量、群落结构、磷脂衍生脂肪酸、稳定碳同位素比率和光合作用与光照的关系等5个断面上测量了6个浮游植物参数。平均值(±S.E.)浮游植物生产力的深度综合估计值为914±185mgc·m-2·d-‘(n=9)。浅层(10微米，中间很少)。最高的生长速率出现在非常窄的光照范围内：在较深的水域中，自遮荫限制了生长(在低于125moL S-1m-2的光强下)，在浅水中(在大于150moL S-1m-2的光强下)生长受到光抑制。由此得到的生物量特定初级生产力(MGC、mChla-1day-1)的最大值与叶绿素a最大值或最高营养浓度的深度不一致。颗粒物的天然碳同位素比率表明，很少陆源碳被出口到狭窄的沿海边缘(约10至20公里)以外。磷脂脂肪酸组成分析还表明，颗粒状有机质以藻类化合物为主，这证实了卡奔塔利亚湾近海的大部分有机质来自海洋。因此，在本研究的夏季，海湾中部的分层水在生物和水文上都独立于沿岸水，不受陆地径流的影响。海湾中部浮游植物的生产是由来自内部来源的营养物质供应维持的，例如那些在沉积物中重新矿化和重新悬浮的营养物质。
To describe the influence of hydrology on the phytoplankton communites of the Gulf of Carpentaria, six phytoplankton parameters were measured on five transects: productivity, biomass, community structure, phospholipid-derived fatty acids, ratios of stable carbon isotopes and the relationship between photosynthesis and irradiance. The mean (±s.e.) estimate of depth-integrated phytoplankton productivity was 914±185 mgC m-2 day-' (n=9). In the shallow ( 10µm, with little in between. The highest rates of growth occurred within a very narrow light regime: self-shading limited growth in deeper water (at light intensities less than 125 mol s-1 m-2), and growth was photoinhibited in shallow water (at light intensities greater than 150 mol s-1 m-2). The resulting biomass-specific primary productivity (mgC mChla-1 day-1) maximum did not coincide with the depth of either the chlorophyll a maximum or the highest nutrient concentration. The natural carbon isotope ratio for the particulate matter showed that little land-derived carbon was exported beyond a narrow coastal fringe (about 10 to 20 km). The profiles of phospholipid fatty acids also showed that particulate organic matter was dominated by algal-derived compounds, which confirms that the bulk of the organic matter in the offshore Gulf of Carpentaria is of marine origin. Therefore, during the summer in this study, the stratified waters of the central gulf were both biologically and hydrologically independent of the coastal water and not influenced by terrestrial runoff. The phytoplankton production in the central gulf is maintained by nutrient supplies from internal sources, such as those that are remineralized in and resuspended from the sediment.