Temporal variability of phytoplankton biomass and net community production in a macrotidal temperate estuary
Temporal variability of phytoplankton biomass and net community production in a macrotidal temperate estuary
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DOI：
10.1016/j.ecss.2022.108182
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发表时间：
2022-12-13
影响因子：
2.8
通讯作者：
Purdie，Duncan A.
中科院分区：
文献类型：
--
作者：
Gomez-Castillo，Africa P.;Panton，Anouska;Purdie，Duncan A.
海岸带在地球生物地球化学过程中起着重要作用。在这些区域内，河口因其复杂的生态相互作用和时空变化而尤为重要。本研究的目的是应用长达一年的高频（15分钟）环境数据时间序列来确定影响南安普顿河口浮游植物繁殖的时间和因素。利用固定式光电仪测量的溶解氧数据，采用开放式氧法估算了总初级生产量（GPP）、生态系统呼吸（ER）和净群落生产量（NCP）的日综合速率。额外的水质数据，包括温度、盐度、叶绿素浓度和浊度，可以研究在不同时间尺度上发生的物理和生物过程之间的关系。春夏期主要浮游植物华的发生与河口水温和平均水柱辐照度临界值有关。此外，发现小潮在春末和夏季促进浮游植物华的开始。河口生态系统的年日平均NCP呈现出估计的净异养状态（−0.8 mmol O2m−2d−1），尽管季节性生产力事件将这种状态转变为净自养状态数天，有时甚至数周。本研究的结果表明，光电仪的高频率情境溶解氧测量可以为了解温带大潮河口影响水华事件的关键因素做出有价值的贡献。因此，如果将这种方法更广泛地应用于其他沿海地区，将有助于巩固沿海地区的全球年度初级生产预算。
Coastal zones play a significant role in Earth's biogeochemical processes. Within these regions, estuaries are particularly important due to their complex ecological interactions and spatial and temporal variability. The aim of this study was to apply a year long high-frequency (15 min) environmental data time series to identify both the timing and factors influencing phytoplankton blooms in the Southampton Water estuary. Dissolved oxygen measurements from anin situdeployed optode were applied to the open diel oxygen method to estimate daily integrated rates of gross primary production (GPP), ecosystem respiration (ER) and net community production (NCP). Additional water quality data including temperature, salinity, chlorophyll concentration and turbidity allowed the relationship between physical and biological processes occurring over different time scales to be investigated. The occurrence of major phytoplankton blooms during the spring-summer period were associated with critical values of estuarine water temperature and mean water column irradiance. In addition, neap tides were found to promote the initiation of phytoplankton blooms in late spring and summer months. Annual daily average NCP for the estuarine ecosystem presented an estimated net heterotrophic state (−0.8 mmol O2m−2d−1), although seasonal productivity events shifted this state for several days and sometimes weeks to net autotrophic conditions. The results of this study have demonstrated how high frequencyin situdissolved oxygen measurements from an optode can make a valuable contribution to understanding the key factors influencing bloom events in a temperate macrotidal estuary. This approach if applied more widely to other coastal sites could therefore contribute to consolidating global annual primary production budgets for coastal regions.