Seasonal and spatial variation of bacterial production and abundance in the northern Levantine Sea

Spatial and temporal heterogeneity in bacterial production and abundance in relation to ambient bio-physicochemical parameters has been investigated in the Levantine Sea. Five stations with different trophic states in an area extending from highly eutrophic Mersin bay to the mesotrophic Rhodes gyre area including the oligotrophic offshore waters were sampled four times. Integrated bacterial production varied between 6.1 and 90.3 g C m(-2) d(-1) with higher rates occurring during September 2012 in offshore waters. Bacterial abundance ranged between 0.18 and 7.3 x 10(5) cells ml(-1) within the euphotic zone and was generally higher up to 100 meters throughout the study period. In offshore waters, bacterial production (0.401 to 0.050 mu g C m(-3) d(-1)), abundance (4.5 to 1.6 x 10(5) cells ml(-1)) and depth of the productive layer decreased from 150 to 75 meters westward along the transect. Although the highest abundance was observed in July 2012 in offshore waters, the highest activity was measured in September 2012. These results indicated that the temperature played a key role in regulating bacterial abundance and production in the area. High chlorophyll concentrations in March did not correspond to high bacterial abundance and production at the same time. Increase in dissolved organic carbon content following spring phytoplankton bloom and the increase in temperature in the mean time might have enhanced the bacterial activity towards summer.
Mediterranean Marine Science


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Yucel, Nebil (Elsevier BV, 2018-7)
Spatial and temporal variations in size-fractionated primary production (PP) and chl a, in relation to ambient physicochemical parameters, were studied in the three distinct ecosystems of northeastern Levantine Basin namely eutrophic Mersin Bay, mesotrophic Rhodes Gyre, and oligotrophic offshore waters. These ecosystems were visited in July and September 2012 and March and May 2013. Total primary production (TPP) rates ranged between 0.22 and 17.8 mg C m(-3) h(-1) within the euphotic zone, whereas depth-int...
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Seasonal and spatial distribution of phytoplankton pigment composition in July & Sep 2012 and Mar & May 2013 was studied at five stations in different parts of the northern Levantine Sea from Mersin Bay to Rhodes Gyre. Total chlorophyll a concentrations varied 0.001 – 0.578 mg m-3 during the study. The highest value was measured in cyclonic Rhodes Gyre at 70 meters in Deep Chlorophyll Maximum (DCM). But, concentrations were found less than 0.1 mg m-3 in offshore waters and Rhodes Gyre. Seven phytoplankton g...
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The aim of this study was to understand spatial and temporal variations of inorganic and organic forms of phosphorus in the surface and deep waters of Erdemli shelf zone of the Mersin Bay. For this goal, timeseries hydrographical and phosphorus data were obtained monthly at the three selected stations between December 2001 and December 2003. The present results have shown that the concentrations of different fractions of total phosphorus displayed a decreasing trend from nearshore to shelfbreak zone of the ...
Seasonal Changes in the Composition and Abundance ofZooplankton in the Seas of the Mediterranean Basin
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Seasonal changes in the composition, abundance and biomass of zooplankton in the seas of the Mediterranean basin (the Mediterranean, Black and Azov seas) have been reviewed using our own data and data from the literature. In the deep-water central regions of the seas, the seasonal cycle of zooplankton abundance is characterised by one maximum occurring in spring or summer. In the coastal regions, two to three peaks (spring, summer and autumn) exist for the zooplankton abundance. The amplitude of seasonal fl...
Öztürk, İlayda Destan; Kıdeyş, Ahmet Erkan; Department of Marine Biology and Fisheries (2015-10-07)
Spatial distribution and composition of zooplankton was studied in the southern Black Sea at 46 stations in July 2013. The southern Black Sea was examined as three different study areas namely; western, central and eastern regions. Each region was also examined as inshore and offshore to determine the difference in zooplankton communities. Additionally a DNA barcoding study was also performed with samples collected from seven stations in the southern Black Sea to generate a gene library of zooplankton speci...
Citation Formats
N. YUCEL, “Seasonal and spatial variation of bacterial production and abundance in the northern Levantine Sea,” Mediterranean Marine Science, 2017, Accessed: 00, 2020. [Online]. Available: