A study on distribution of chlorophyll-<I>a</I> in the coastal waters of Anzali Port, south Caspian Sea

Abstract

Abstract. Phytoplankton as chlorophyll-containing organisms is the first step of production in most marine processes and food chains. Nutrient enhancement in the seawater due to the discharge of agricultural, industrial, and urban wastes threatens the Caspian Sea environment. Increasing concentrations of chlorophyll-a in seawater, in reaction to the elevation of nutrient supply can have severely damaging effects on the marine environment of the Caspian. In this research, seasonal variability of the chlorophyll-a concentrations in the western part of the southern coastal waters of the Caspian Sea near Iranian coast was examined using field observations. The data showed that the most chlorophyll-a was found below the sea surface. The thermal stratification in water column and outflow of the Anzali Lagoon affect the chlorophyll-a concentrations in the region. Concentrations of chlorophyll-a were recorded in midsummer in a range of 0.2–3.4 mg m−3.

Seasonal variations in physico-chemical parameters of Buleji and Paradise Point rocky shores at Karachi coast

“…They also observed higher chlorophyll concentration in the northern Arabian Sea is attributed with the winter cooling phenomena during the months of January to March. Vice versa the results of Jamshidi and Bin Abu Bakar (2011) found the greater concentrations of chlorophyll-a in midsummer than other seasons due to layers on the sea surface receive sufficient amount of sunlight in summer. Moreover besides the extent of light, nutrient concentrations and assimilation of the adjacent coastline also influence on chlorophyll-a.…”

“…Therefore, the investigation on variations of chlorophyll-a is very important to the study of water quality and marine pollution in the Sea. It is natural for levels of chlorophyll-a to fluctuate over the different seasons (Jamshidi, S and Bin Abu Bakar, N 2011). Physico-chemical parameters affected the primary production in different seasons; the primary production varied from season to season with the load of nutrient salts in addition to phytoplankton species (Muduli and Prasanna 2010).…”

Environmental Characteristic of Phyllophorus sp. (Echinodermata, Holothuroidea, Phyllophoridae) Habitat in the Madura Strait, Indonesia

“…This showed that the site has good light penetration so it allowed microalgae to do photosynthesis, which ultimately caused high chlorophyll-a content of 26.28 µg.L -1 (Table 1). Fluctuations in water chlorophyll-a content also depended on physical, chemical, and biological factors such as temperature, currents, phosphate, nitrates concentration (Jamshidi and Bakar, 2011), and suspended particulate matter. The latter is closely related to the penetration of light and nutrients related to its function in enzymatic reactions.…”