Seasonal cycles of phytoplankton in relation to the hydrography of Monterey Bay
Seasonal cycles of phytoplankton in relation to the hydrography of Monterey Bay
复制标题
浮游植物的季节循环与蒙特利湾水文学的关系
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
G. Schrader
中科院分区：
文献类型：
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作者：
G. Schrader
描述了 1974 年 7 月至 1976 年 6 月从加利福尼亚州蒙特利湾收集的浮游植物物种的相对丰度的年度周期，以及种群数量
与年度水文循环有关的动态。浅海质
上升流期间硅藻种类占主导地位
和海洋时期，甲藻物种在戴维森时期在数量上变得更加重要。使用法格的重组分析确定的经常出现的物种群体揭示了一个具有压倒性数量重要性的大型浅海群体的存在。该群体由本地物种组成，一年中大部分时间都出现在海湾中。浮游植物种群的显着变化主要发生在该组内的物种中。在戴维森时期，
南部水域进入海湾的平流可能会暂时取代当地特有物种，甲藻在数量上变得更加重要。 1974年这一时期发生了一次膝沟藻赤潮水华，在长达六周的时间里，它在浮游植物种群中占据主导地位。
两个水道的种群动态
不同站点进行了比较。一个车站位于
海底峡谷的深水区上空展示了很多
浮游植物现存量低于海湾南部陆架区域的一个站，但相对丰度和物种组成的季节变化相似。两个监测站之间观察到的物理和化学差异似乎是由于峡谷地区最近出现了上升的水，以及海湾南部生物利用率较高的结果。
观察到物种多样性与混合层深度密切相关，多样性随着温跃层浅滩的增加而增加。这表明这可能反映了由于上升流活动而将新物种从温跃层下方引入到混合层中。还表明这可能是由于与内波相关的采样问题而造成的伪影。 （文档包含 100 页。）
Annual cycles of relative abundance are described for phytoplankton species collected from Monterey Bay, California, from July 1974 to June 1976, and the population
dynamics related to the annual hydrographic cycle. Neritic
diatom species dominated the population during the Upwelling
and Oceanic periods, with dinoflagellate species becoming numerically more important during the Davidson period. Recurrent species groups identified using Fager's regroup analysis revealed the presence of a large neritic group of overwhelming numerical importance. This group is composed of indigenous species and is present in the bay during most of the year. Conspicuous changes in the phytoplankton population occurred predominantly among species within this group. During the Davidson period, the
advection of southern waters into the bay may temporarily displace the endemic species with dinoflagellates becoming numerically more important. A red tide bloom of Gonyaulax polyedra occurred during this period in 1974, which dominated the phytoplankton population for a period of six weeks.
The population dynamics of two hydrographically
different stations were compared. A station located
over the deep waters of the submarine canyon exhibited much
lower phytoplankton standing stocks than a station located over the shelf area in the south of the bay, but seasonal changes in relative abundance and species composition were similar. Physical and chemical differences observed between the two stations appear to be the result of the presence of more recently upwelled water in the canyon area, and higher biological utilization in the south of the bay.
A close correlation of species diversity with the depth of the mixed layer was observed, with diversity rising with the shoaling of the thermocline. It is suggested that this may reflect the introduction of new species from below the thermocline into the mixed layer as a result of upwelling activity. It is also suggested that this may be an artifact due to sampling problems associated with internal waves. (Document contains 100 pages.)