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Spatio-temporal variation of microphytoplankton communities in Obhur Creek, the central Red Sea
Oceanological and Hydrobiological Studies ( IF 0.9 ) Pub Date : 2021-03-01 , DOI: 10.2478/oandhs-2021-0010
Mohsen M. El-Sherbiny 1, 2 , Mamdouh A. Al-Harbi 1 , Anand J. Kumar 1
Affiliation  

The abundance and distribution of microphyto-plankton and related physicochemical factors were assessed monthly in Obhur Creek, the central Red Sea. Sampling was carried out near the entrance, the middle and end parts of the creek. During the course of the present study, the Red Sea was characterized by predominantly oligotrophic conditions. Nutrient concentrations were relatively higher in the end part of the creek compared to the two other study sites. Chlorophyll a was also low throughout the year (average: 0.35 ± 0.32 mg m −3 ), except in May when it showed clear peaks at open-water and middle sites of the creek (1.85 and 1.04 mg m −3 , respectively). Phytoplankton abundance followed a similar pattern to that of chlorophyll a with considerably higher abundance at these sites in May (3063.27 × 10 3 and 1082.34 × 10 3 individuals m −3 , respectively). This unusually higher abundance was mostly due to the proliferation of the diatom Pseudo-nitzschia cf. delicatissima (Cleve) Heiden. Silicate concentrations were statistically significantly correlated with total phytoplankton. A total of 220 phytoplankton species were recorded during the study period (117 diatoms, 99 dinoflagellates and four cyanophytes). Diatoms dominated in the phytoplankton abundance (75%) and were followed by dinoflagellates (20%), while cyanophytes accounted for a minimal proportion. Of all phytoplankton species observed during the study, 21 diatom and four dinoflagellate species were considered as new records for the Red Sea, and two diatom and 14 dinoflagellate species were listed as harmful algal species worldwide.

中文翻译:

红海中部奥伯河微浮游植物群落的时空变化

每月在红海中部的奥伯河(Obhur Creek)评估微浮游植物的丰度和分布以及相关的理化因子。采样是在小溪的入口,中部和末端附近进行的。在本研究过程中,红海的主要特征是贫营养。与其他两个研究地点相比,小溪末端的养分浓度相对较高。叶绿素a全年也很低(平均:0.35±0.32 mg m -3),除了5月份叶绿素a在小溪的开阔水域和中间位置显示出明显的峰值(分别为1.85和1.04 mg m -3)。浮游植物的丰度与叶绿素a的模式相似,在五月的这些位置具有较高的丰度(3063.27×10 3和1082.34×10 3个个体m -3,分别)。这种异常高的丰度主要是由于硅藻假拟南芥cf的增殖。delicatissima(Cleve)海登。硅酸盐浓度与浮游植物总含量在统计学上显着相关。在研究期间共记录了220种浮游植物(117种硅藻,99种鞭毛藻和4种蓝藻)。浮游植物丰富度中,硅藻占主导地位(75%),鞭毛鞭毛藻(20%)紧随其后,而蓝藻仅占最小比例。在研究过程中观察到的所有浮游植物物种中,有21种硅藻和4种鞭毛藻被认为是红海的新记录,并且有2种硅藻和14种鞭毛藻被列为全球有害藻类。这种异常高的丰度主要是由于硅藻假拟南芥cf的增殖。delicatissima(Cleve)海登。硅酸盐浓度与浮游植物总含量在统计学上显着相关。在研究期间共记录了220种浮游植物(117种硅藻,99种鞭毛藻和4种蓝藻)。浮游植物丰富度中,硅藻占主导地位(75%),鞭毛鞭毛藻(20%)紧随其后,而蓝藻仅占最小比例。在研究期间观察到的所有浮游植物物种中,有21种硅藻和4种鞭毛藻被认为是红海的新记录,并且有2种硅藻和14种鞭毛藻被列为全球有害藻类。这种异常高的丰度主要是由于硅藻假拟南芥cf的增殖。delicatissima(Cleve)海登。硅酸盐浓度与浮游植物总含量在统计学上显着相关。在研究期间共记录了220种浮游植物(117种硅藻,99种鞭毛藻和4种蓝藻)。硅藻在浮游植物的丰度中占主导地位(75%),其次是鞭毛藻(20%),而蓝藻仅占最小比例。在研究期间观察到的所有浮游植物物种中,有21种硅藻和4种鞭毛藻被认为是红海的新记录,并且有2种硅藻和14种鞭毛藻被列为全球有害藻类。硅酸盐浓度与浮游植物总含量在统计学上显着相关。在研究期间共记录了220种浮游植物(117种硅藻,99种鞭毛藻和4种蓝藻)。浮游植物丰富度中,硅藻占主导地位(75%),鞭毛鞭毛藻(20%)紧随其后,而蓝藻仅占最小比例。在研究期间观察到的所有浮游植物物种中,有21种硅藻和4种鞭毛藻被认为是红海的新记录,并且有2种硅藻和14种鞭毛藻被列为全球有害藻类。硅酸盐浓度与浮游植物总含量在统计学上显着相关。在研究期间共记录了220种浮游植物(117种硅藻,99种鞭毛藻和4种蓝藻)。浮游植物丰富度中,硅藻占主导地位(75%),鞭毛鞭毛藻(20%)紧随其后,而蓝藻仅占最小比例。在研究期间观察到的所有浮游植物物种中,有21种硅藻和4种鞭毛藻被认为是红海的新记录,并且有2种硅藻和14种鞭毛藻被列为全球有害藻类。浮游植物丰富度中,硅藻占主导地位(75%),鞭毛鞭毛藻(20%)紧随其后,而蓝藻仅占最小比例。在研究期间观察到的所有浮游植物物种中,有21种硅藻和4种鞭毛藻被认为是红海的新记录,并且有2种硅藻和14种鞭毛藻被列为全球有害藻类。浮游植物丰富度中,硅藻占主导地位(75%),鞭毛鞭毛藻(20%)紧随其后,而蓝藻仅占最小比例。在研究期间观察到的所有浮游植物物种中,有21种硅藻和4种鞭毛藻被认为是红海的新记录,并且有2种硅藻和14种鞭毛藻被列为全球有害藻类。
更新日期:2021-03-22
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