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首页> 外文期刊>International Journal of Aquatic Biology >Benthic community structure in the Gorgan Bay (Southeast of the Caspian Sea, Iran): Correlation to water physiochemical factors and heavy metal concentration of sediment
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Benthic community structure in the Gorgan Bay (Southeast of the Caspian Sea, Iran): Correlation to water physiochemical factors and heavy metal concentration of sediment

机译：Gorgan湾（伊朗里海东南部）的底栖生物群落结构：与水的物理化学因子和沉积物中重金属浓度的关系

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Macrobentos frequency and biomass was investigated in the Gorgan Bay in 2011. Five sampling sites were chosen to collect benthos and sediment from the Bay using a Van Veen grab sampler. Samples were collected seasonally. Macrobenthos were indentified and their biomass was recorded. Sediment heavy metals concentration were measured using Atomic Absorption Spectroscopy. A total of 11 families belonging to three phyla of invertebrates were found. The phyla were Annelids (Nereidae, Naididae, Ampharetidae, Lumbriculidae, Tubificidae and Amphiporidae), Arthropods (Pontogammaridae, Balanidae and Chironomidae) and Mollusks (Cardiidae and Scrobicularidae). Lumbriculidae (413 individuals m -2 , corresponding to 18.7%) and Cardiidae (55.2 g m -2 , corresponding to 82.4%) had the highest frequency and biomass, respectively. Annelids with an average of 1557 individuals m -2 was the most frequent groups, while, mollusks with the average of 141 g per m 2 had the highest biomass. Results showed that macrobenthos frequency in summer was significantly higher than those of the other seasons, however, in the case of biomass, there was a significantly higher biomass in the spring than the other seasons. The maximum metal concentration was related to Zn and Pb, whereas, Cr and Cd had the lowest values. There was no significant difference in Zn and Cr concentrations among the sampling seasons. Pb concentration in winter was significantly lower than the other seasons, whereas, Cd concentrations in the spring and summer were significantly lower than the autumn and winter. There were some correlations between benthos frequency and water physiochemical characteristics and sediment heavy metal levels. This study indicated that benthic fauna of the Gorgan Bay and the Caspian Sea are not similar. Also, results showed that benthic fauna communities are affected by sediment heavy metal concentrations and water physiochemical characteristics, however, different benthos groups show unsimilar relationship with heavy metal concentration.
机译：2011年在Gorgan湾调查了大本钟的频率和生物量。使用Van Veen抓斗采样器，选择了五个采样点从该湾收集底栖生物和沉积物。季节性收集样品。识别大型底栖动物并记录其生物量。使用原子吸收光谱法测量沉积物中重金属的浓度。总共发现了11个科，它们属于3种无脊椎动物。菌群是Annilidas（Nereidae，Naididae，Amphartretidae，Lumbriculidae，Tubificidae和Amphiporidae），节肢动物（Pontogammaridae，Balanidae和Chironomidae）和软体动物（Cardiidae和Scrobicularidae）。 mb科（413个个体m -2，占18.7％）和小Card科（55.2 g m -2，占82.4％）分别具有最高的发生频率和生物量。平均频率为1557个个体的鸭-m -2是最常见的群体，而平均分子质量为141 g / m 2的软体动物则具有最高的生物量。结果表明，夏季大型底栖动物的频率明显高于其他季节，但是，在生物量方面，春季的生物量明显高于其他季节。最大金属浓度与Zn和Pb有关，而Cr和Cd最低。在采样季节之间，锌和铬的浓度没有显着差异。冬季铅的浓度显着低于其他季节，而春季和夏季的镉浓度显着低于秋季和冬季。底栖生物频率与水的理化特性和沉积物重金属含量之间存在一定的相关性。这项研究表明，戈根湾和里海底栖动物区系不相似。结果还表明，底栖动物群落受到沉积物重金属浓度和水的理化特性的影响，但是，不同的底栖动物群与重金属浓度的关系却不相似。

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