Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
Mar Pollut Bull. 2023 Jun;191:114931. doi: 10.1016/j.marpolbul.2023.114931. Epub 2023 Apr 17.
Biomass dynamics in the marine lake are strongly dependent on seasonal variability in vertical stratification, indicating rapid adaptation of phytoplankton to short-term changes in the water column. A small marine lake (Rogoznica Lake, Croatia), which fluctuates between stably stratified and holomictic euxinic conditions, was used as a model to study the phytoplankton responses to environmental perturbations, in particular the anoxic stress, caused by periodic holomixia. The epilimnion showed significant temporal and vertical variability with a chlorophyll a subsurface maximum with the highest biomass near the chemocline. Fucoxanthin-containing biomass (diatoms) dominated in the epilimnion in colder seasons and was first to recover after holomictic euxinic events. The shift towards the smaller groups prevailed during highly stratified water column conditions in warmer seasons. Results for the hypolimnion were more enigmatic, with high concentrations of alloxanthin, zeaxanthin, and violaxanthin indicating the presence of a viable small-size mixotrophic community under extreme conditions.
海洋湖泊中的生物量动态强烈依赖于垂直分层的季节性变化，这表明浮游植物能够快速适应水柱的短期变化。一个小型海洋湖泊（克罗地亚的罗戈日尼亚湖）的水层在稳定分层和全混相缺氧之间波动，被用作研究浮游植物对环境干扰（特别是周期性全混相缺氧引起的缺氧胁迫）的响应的模型。表水层表现出显著的时间和垂直变化，在化变层附近存在叶绿素 a 次表层最大值，生物量最高。含有岩藻黄素的生物量（硅藻）在较冷季节占表水层的主导地位，并且在全混相缺氧事件后首先恢复。在较温暖季节水柱高度分层时，向更小群体的转变占主导地位。深水层的结果更加神秘，所有黄质、玉米黄质和紫黄质的高浓度表明在极端条件下存在可行的小型混合营养群落。
