Investigation of the Seasonal Variation in the Phytoplankton in the Surface Waters of the Gulf of Edremit

Ece Ağlaç, N. Balkıs
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引用次数: 1

Abstract

The aim of this study was to determine the phytoplankton species existing in the Gulf of Edremit and some environmental conditions affecting them. Samples were collected in July and October 2003 and in January and April 2004 from 3 stations through horizontal tows using a plankton net. After the analysis of plankton samples, 123 species that belong to 5 classes were identified. It was determined that one species (Phalacroma cuneus Schutt, 1895) was a new record for Turkish waters. The species composition mostly consisted of dinoflagellates (53.7%) which were followed by diatoms (43.9%). Most of the species which were identified in this study were similar to those phytoplanktonic algal species which were reported from the Eastern Mediterranean Sea in previous studies. These are neritic, oceanic, temperate and subtropical climate species. It was detected that 10 out of 19 potentially harmful algal species identified in this study were toxic species; however, they did not show an extreme increase. Dinophyceae had the highest cell number in July (1100 cell/L, St.1) and Bacillariophyceae in April (2280 cell/L, St.2). The environmental variables of the seawater such as temperature (13.0-26.5 oC), salinity (35.9-38.5‰) and dissolved oxygen (4.43-8.46 mg/L) were measured in every sampling period. Consequently, the phytoplankton species and their abundances in the Gulf of Edremit were firstly determined with this study, and phytoplankton composition representing oligotrophic sea water characteristic in the Aegean Sea was obtained.
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埃德梅特湾表层浮游植物季节变化的调查
本研究的目的是确定在Edremit湾存在的浮游植物种类和一些影响它们的环境条件。在2003年7月和10月以及2004年1月和4月,利用浮游生物网通过水平拖网在3个站点采集样本。通过对浮游生物样本的分析,鉴定出5纲123种。其中一种(Phalacroma cuneus Schutt, 1895)为土耳其水域新记录。种类组成以甲藻类(53.7%)居多,其次为硅藻(43.9%)。本研究鉴定的浮游藻类种类与以往在东地中海报道的浮游藻类种类相似。这些是浅海,海洋,温带和亚热带气候物种。在本研究中发现的19种潜在有害藻类中,有10种是有毒的;然而,它们并没有显示出极端的增长。7月甲藻门细胞数最多(1100个/L, St.1), 4月硅藻门细胞数最多(2280个/L, St.2)。测定各采样周期海水温度(13.0 ~ 26.5℃)、盐度(35.9 ~ 38.5‰)、溶解氧(4.43 ~ 8.46 mg/L)等环境变量。因此,本研究首次确定了Edremit湾的浮游植物种类及其丰度,并获得了代表爱琴海低营养海水特征的浮游植物组成。
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