MICROPLANKTON OF GULF OF ELAT - ASPECTS OF SEASONAL AND BATHYMETRIC DISTRIBUTION
MICROPLANKTON OF GULF OF ELAT - ASPECTS OF SEASONAL AND BATHYMETRIC DISTRIBUTION
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DOI：
10.1007/bf00392014
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发表时间：
1977-01-01
期刊：
影响因子：
2.4
通讯作者：
GOLANDSKY, B
中科院分区：
文献类型：
--
作者：
KIMOR, B;GOLANDSKY, B
在以色列埃拉特H.Steinitz海洋生物实验室附近的一个永久站点，以600米的深度收集净样本，确定了4个主要微浮游生物组的组成，并确定了它们的数量丰度。所分析的样本从1974年6月开始，每两周收集一次，为期一年。研究的类群是浮游植物的蓝藻门、硅藻门和甲藻门，以及微型浮游动物的丁尼娜。浮游植物的垂直分布格局总体上表现为细胞数量随着深度的增加而减少。蓝藻，主要由毛霉菌组成。毛状体主要分布在100m以上，硅藻分布不均匀，有1种微小中心硅藻--枯草海链藻(Thalassiosira Subtilis)，与1975年3月300-400m之间的一次大规模水华有关。近海生物种类最多，包括在整个水柱中均匀分布的种类，根据其光强偏好，限制在上层或更深的水层。1975年4月，在200-300m的深度范围内，新出现的甲藻(一种弱甲甲藻)的甲藻孢囊大量出现，这表明甲藻的生殖过程也可能受光控制。与浮游植物类群一样，丁螺类在100米以上的水层中数量最多，在较深的水层中，个体数量逐渐减少，但种类不多。浮游生物的总体年分布模式有3个高峰：晚秋和初夏高峰，主要由蓝藻组成；1个高峰在早春，由几种硅藻和裙带藻组成，以及与浮游植物在同一生态位中繁盛的锡尼类物种。浮游植物和金龟子的产量在夏季都是最低的。
The components of 4 major groups of microplankton were identified and their numerical abundance determined in net samples collected at depth intervals down to 600 m at a permanent station off the H. Steinitz Marine Biological Laboratory, Elat, Israel. The samples analyzed were collected once a fortnight over a period of 1 yr beginning in June 1974. The groups studied were the Cyanophyta, Bacillariophyta and Pyrrhophyta of the phytoplankton and the Tintinnina of the microzooplankton. The pattern of vertical distribution of the phytoplankton as a whole showed a general decrease in cell numbers with increasing depth. The blue-green algae, consisting mainly of Trichodesmium sp. trichomes, were confined primarily to the upper 100 m. The diatoms were unevenly distributed, with 1 sp., a minute centric diatom, Thalassiosira subtilis, associated with a massive bloom during March 1975 between 300 and 400 m. The peridinians, the group with the largest number of species, included forms which were evenly distributed throughout the whole water column and forms limited either to the upper or deeper water strata in accordance with their light intensity preferences. The mass occurrence of newly-emerged dinoflagellate cysts of Pyrophacus horologicum, a weakly-armored dinoflagellate, in the 200-300 m depth interval during April 1975, suggests that reproductive processes in dinoflagellates may also be light-controlled. The tintinnids, like the phytoplankton groups, were most abundant in the upper 100 m with a gradual decrease in numbers of individuals, though not in species, in the deeper water strata. The overall yearly pattern of microplankton distribution indicated 3 peaks: late fall and early summer peaks consisting primarily of blue-green algae and 1 in early spring consisting of several species of diatoms and peridinians and of species of tintinnids which thrive in the same niches as the phytoplankton. Both phytoplankton and tintinnid production was lowest during the summer months.