Vertical migration by the marine dinoflagellate Prorocentrum triestinum maximises photosynthetic yield
Vertical migration by the marine dinoflagellate Prorocentrum triestinum maximises photosynthetic yield
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DOI：
10.1007/s004420000472
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发表时间：
2000-12-01
期刊：
影响因子：
2.7
通讯作者：
Ault, TR
中科院分区：
文献类型：
--
作者：
Ault, TR
虽然垂直迁徙在许多甲藻物种中已被广泛记录，但该策略的适应优势仍不清楚。为了研究海洋甲藻三原甲藻的日垂直迁移与光合作用产量随深度变化的关系，采用了两种实验方法。首先，根据光合作用速率随深度的变化，研究了浅水河口三裂叶藻的垂直分布格局。其次，在人工水柱中，研究了入射光通量变化对三柱藻垂直位置的影响。在田间试验中，三角帆船瓶装培养物中溶解氧浓度的变化表明，光合作用速率在0.5m深处达到最大值。水柱中的细胞密度在0.5m处也是最高的，并随着光合作用产量的不同而变化。荧光测量表明，在过饱和的光合作用光子通量密度(PPFDs)下，光抑制。类似的模式在人造水柱中也很明显。随着入射PPFD的不同，P.triestina的深度分布明显不同；随着PPFD的增加，最大细胞密度带向下移动，而随着PPFD的减少，最大细胞密度带向上移动。细胞相对于PPFD的分布与现场实验中观察到的非常相似。总体而言，三柱藻白天的垂直位置与最大限度地提高光合作用产量的主动迁徙机制是一致的。
Although vertical migration has been widely documented in many dinoflagellate species, the adaptive advantages of the strategy remain unclear. To investigate relationships between diurnal vertical migration and depth-related variation in photosynthetic yield in a marine dinoflagellate, Prorocentrum triestinum (Schiller), two experimental approaches were adopted. First, vertical distribution patterns of P. triestinum in a shallow estuary were investigated with respect to depth-related variation in photosynthetic rate. Second, changes in vertical positioning of P. triestinum in response to manipulations in incident light flux were investigated in an artificial water column. During the field experiment, changes in dissolved oxygen concentration in bottle cultures of P. triestinum indicated maximum rates of photosynthesis at 0.5 m depth. Cell densities of P. triestinum in the water column were also highest at 0.5 m depth and varied in accordance with photosynthetic yield. Fluorescence measurements indicated photoinhibition at super-saturating photosynthetic photon flux densities (PPFDs). Similar patterns were evident in the artificial water column. Depth distribution of P. triestinum varied significantly according to incident PPFD; the band of maximum cell density shifted downward in response to an increase in PPFD and upward in response to a PPFD decrease. Distributions of cells with respect to PPFD were very similar to those observed in the field experiment. Overall, vertical positioning of P. triestinum during the day is consistent with an active migratory mechanism for maximising photosynthetic production.