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Abstract

This study concentrated on temporal distribution and species composition of phytoplankton connected with physicochemical variations between January 2003 and November 2004 in the South Western Caspian Sea. During the study, 75 phytoplankton were distinguished in total and average phytoplankton densities in 2003 and 2004 were 1.47×10 5 ±6.05×10 4 and 1.97×10 5 ±7.18×10 4 cells L-1 , respectively. Contributions of diatoms (66.0% in 2003; 57.0% in 2004) and cyanophytes to total phytoplankton (17.0 in 2003; 36.0% in 2004) were higher than any other group. Diatoms Dactyliosolen fragilissimus and Thalassionema nitzschioides, and cyanophytes Oscillatoria sp. and Anabeanopsis raciborskii provided the biggest contributions to the total phytoplankton. Average DIN concentration in 2003 was higher (3.86±1.65 µM) than the average in 2004 (3.37±1.13 µM). However, average DIP concentration in 2003 was lower (1.45±1.37 µM) than the average in 2004 (1.99±0.67 µM). Average DIS concentration was twofold higher than average DIN concentration. Average DIN:DIP without

Viromes of Coastal Waters of the North Caspian Sea: Initial Assessment of Diversity and Functional Potential

“…This fact is confirmed by active oil production on the Caspian shelf that causes contamination of seawater during transportation and pumping on oil tankers and in terminals [89]. The presented data confirm the fact that the population growth in the cities of the Caspian basin, increasing discharge of various wastewaters (industrial, agricultural and urban wastewater), development of oil production in the area, growing river navigation and eventual connection of the Caspian Sea with the World Ocean resulted in a significant increase in anthropogenic pressure on the unique ecosystem of the Caspian Sea and disturbance of its balance [90].…”

Seasonal species diversity and abundance of phytoplankton from the southwestern Caspian Sea

“…This survey showed that diatoms such as Thalassionema nitzschiodes and pyrrophyte Exuviaella cordata and cyanophyte Oscillatoria limosa were prevalent in Phytoplankton populations at the site. Bagheri et al (2014) showed that diatom communities were represented by a few dominant species such as D. fragilissimus and T. nitzschioides in the system.…”

“…In the Caspian Sea, various factors such as hydrological regimes, climate anomalies, increasing detergents, increasing the flow of fresh water through rivers, and increasing the level of nutrients due to the discharge of industrial and agricultural waste can affect the diversity and density of phytoplankton in coastal water of Caspian Sea (Kideys et al 2008;Bilio and Niermann 2004). Bagheri et al (2014) theorized that hydro-biological changes in the Caspian Sea, Black Sea, and Baltic Sea during the 1990s and 2000s could be definitely correlated with climatical and hydrological characters.…”