The blooms of a cyanobacterium, Microcystis cf. aeruginosa in a severely polluted estuary, the Golden Horn, Turkey

Taş, Seyfettin; Okuş, Erdoǧan; Aslan-Yılmaz, Aslı

doi:10.1016/j.ecss.2006.02.025

Cited by 36 publications

(14 citation statements)

References 13 publications

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“…The Microcystis blooms generally occur during the summer months due to increasing temperature in lake ecosystems, and Microcystis aeruginosa blooms were mainly related to the poor water quality (TAŞ et al, 2006). In the previous studies, high values of WT, pH and Z eu /Z mix were detected when Microcystis aeruginosa dominated in Xiangxi Bay, indicating its good adaptability to the water column stratification conditions in summer influenced by weak water level fluctuations (WANG et al, 2010a).…”

Section: Discussionmentioning

confidence: 87%

Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

Wang

Cai

Tan

et al. 2011

International Review of Hydrobiology

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The Three Gorges Reservoir (TGR) had a great inflow discharge with small water level fluctuations in the flood season of the year 2008, when a large-scale cyanobacterial bloom broke out in Xiangxi Bay (a tributary bay behaving like a lake) for the first time after the construction of the TGR impoundment. To compare spatiotem poral longitudinal differences of phytoplankton community structure during this period, weekly surveys were performed in Xiangxi Bay. The cyanobacterial bloom lasted from June 6 to July 18, 2008, with Microcystis aeruginosa as the dominant species. During this bloom the species diversity, evenness and community change rate was relatively low. The probable causes for the interruption of the bloom were precipitation and water temperature. In the non-cyanobacterial bloom period (July 25 to September 26, 2008) many other species dominated the community including Stephanodiscus hantzschii and Cryptomonas ovata, with higher values of species diversity, evenness and community change rate. As for the longitudinal differences, the community structure in the riverine zone was different from that in other zones, indicating the important effect of inflow from the upstream of Xiangxi Bay. The management actions in Xiangxi Bay should prevent blooms in the mainstream, lacustrine and transitional zone. IntroductionPhytoplankton composition can be recognized as a natural bioindicator because of its complex and rapid responses to fluctuations of environmental conditions (L IVINGSTON, 2001). Phytoplankton community composition changes as a consequence of species succession, which occurs in response to new environmental conditions (ÁLVAREZ-GÓNGORA and HERRE- RA-SILVEIRA, 2006). Two important factors appear to control the phytoplankton community structure, as well as the species succession. The first one is related to physical processes such as mixing conditions, light, temperature, turbulence, and salinity; and the second one is associated with nutrients (YUSOFF et al., 2002;NUCCIO et al., 2003;DOMINGUES et al., 2005;ÁLVAREZ-GÓNGORA and HERRERA-SILVEIRA, 2006;BROGUEIRA et al., 2007;DOMINGUES et al., 2007).

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Section: Discussionmentioning

confidence: 87%

Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

Wang

Cai

Tan

et al. 2011

International Review of Hydrobiology

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“…Ultrasonication yielded a disintegration efficiency similar to that of alkaline hydrolysis only for M. novacekii and the field sample. In consequence, though widely employed (Oberholster et al 2009;Orr et al 2004;Taş et al 2006), we do not consider ultrasonication consistently valid for disintegrating different Microcystis samples. Other researchers have also found that ultrasonication leads to underestimation of cell concentrations (Humphries and Widjaja 1979;Joung et al 2006).…”

Section: Validation Of Unicellular Microcystis Enumeration By Flowcammentioning

confidence: 94%

A quantitative protocol for rapid analysis of cell density and size distribution of pelagic and benthic Microcystis colonies by FlowCAM

Wang

Tian

et al. 2014

J Appl Phycol

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Colony formation plays an important role in the life history of Microcystis. However, analyzing the colony size distribution with a microscope is time consuming, and colony formation also hinders the direct monitoring of cell density. In this study, a quantitative protocol for rapidly analyzing the cell density and colony size distribution of pelagic and benthic Microcystis was developed. Microcystis colonies were disintegrated by alkaline hydrolysis with 0.01-0.05 mol L −1 sodium hydroxide at 85°C for 6-8 min and automatically measured by the Flow Camera And Microscope (FlowCAM). Benthic Microcystis colonies were isolated from different lake sediments using 40 % Percoll solution. Alkaline hydrolysis was validated as a rapid and universally effective method to disintegrate different morphospecies of Microcystis colonies. The FlowCAM exhibited excellent accuracy, reproducibility, and efficiency in determining the cell density and size distribution of Microcystis. The developed protocol was successfully applied to field samples from Lake Caohai (China) and can accurately monitor the population dynamics and colony size distribution of bloom-forming Microcystis.

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“…4 and 5). The highest DO contents were measured in the inner estuary in April and May in accord with photosynthetic activity, whereas the lowest values were measured at Sünnet Bridge in November confirming organic matter degradation (Okuş et al 2001;Taş et al 2006Taş et al , 2008. Surface water DO values showed the decreasing variation from Camialtı to the inner estuary during this month because of eutrophication.…”

Section: Do Content Of Surface Watermentioning

confidence: 94%

“…In addition, the effect of lateral inputs to the surface water was easily noticeable, compared with DO concentrations in water masses of the Istanbul Strait (Kıratlı and Balkıs 2001;Sur et al 2002). Although DO values increased resulting from photosynthetic activities, the contents along the water May 2000, the sudden phytoplankton blooms (eutrophication) occurred in the estuary amounting to counts of 50 million cell l −1 (Okuş et al 2001;Taş et al 2006;Yüksek et al 2006). The organic matter content of the water column increased after these extreme phytoplankton blooms, and DO contents in both the surface and bottom waters decreased rapidly as a result of decomposition processes.…”

Section: Tss Content Of the Bottom Watermentioning

confidence: 99%

The chemical oceanographic consequences of environmental restoration projects in the Golden Horn estuary (Marmara Sea, Turkey)

Balkıs

Müftüoğlu

Aksu

et al. 2009

Environ Monit Assess

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The input of industrial and domestic waste to the horizontal circulation in the Golden Horn Estuary of Marmara Sea has resulted in one of the most polluted estuaries in the past. Consequently, the dissolved oxygen concentrations in both the surface and bottom waters decreased toward to the estuary head during 1998-2005. In contrast, the total suspended solids content of the surface water decreased toward to the estuary mouth. However, construction of the operational collector system surrounding the estuary during the process of rehabilitation projects, combined with the opening of the middle pontoons of the Valide Sultan Bridge, resulted in gradually improved water quality of the estuary with a concomitant decrease in pollution. However, phytoplankton blooms and eutrophication persist especially in the innermost part of the Golden Horn in 2005. The region from the estuary mouth up to Camialti has a dynamic structure, and sufficient circulation seemingly occurs in this part of the Golden Horn.

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The blooms of a cyanobacterium, Microcystis cf. aeruginosa in a severely polluted estuary, the Golden Horn, Turkey

Cited by 36 publications

References 13 publications

Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

A quantitative protocol for rapid analysis of cell density and size distribution of pelagic and benthic Microcystis colonies by FlowCAM

The chemical oceanographic consequences of environmental restoration projects in the Golden Horn estuary (Marmara Sea, Turkey)

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