Temporal (Seasonal and Interannual) Changes of Ecosystem of the Open Waters of the Black Sea

Vinogradov, M. E.; Shushkina, E. A.; Mikaelyan, Alexander S.; Nezlin, Nikolay P.

doi:10.1007/978-94-011-4568-8_8

Cited by 24 publications

(31 citation statements)

References 8 publications

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“…April and May) when nutrient-rich shelf waters are sufficiently warm for phytoplankton growth (Yunev et al, 2007;McQuatters-Gollop et al, 2008). On the other hand, major nutrient source for the open waters comes from the nutricline (Yilmaz et al, 2008) and experiences its bloom during autumn (Vinogradov et al, 1999). Besides, summer and early autumn blooms are mainly characterized by coccolithophores with the strong thermocline and depletion of nutrients (Hay et al, 1990;Vedernikov and Demidov, 1997;Yilmaz et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…The open Black Sea experiences its Chl-a maximum during autumn and winter with minimum levels reported during the summer months (McQuatters-Gollop et al, 2008;Vinogradov et al, 1999). It should be take into consideration that the pattern of primary productivity in most of the Black Sea is determined by material transported via the cyclonic boundary Rim current and the frontal jet instabilities between the Rim current and the interior eddy fields (Yilmaz et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

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Ağırbaş¹,

Feyzioglu²,

Kopuz³

2014

Turk. J. Fish. Aquat. Sci.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Ağırbaş¹,

Feyzioglu²,

Kopuz³

2014

Turk. J. Fish. Aquat. Sci.

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“…During the past few decades, the Black Sea has experienced high inter-annual variation in Chl-a, which was attributed to eutrophication (Kideys, 1994;Vinogradov et al, 1999;McQuatters-Gollop et al, 2008, Mikaelyan et al, 2013. Historic studies of primary production from 1960-1991 reported values of 570-1200 mgCm -2 d -1 along the NW shelf, 320-500 mgCm -2 d -1 along the continental slope, and 100-370 mgCm -2 d -1 in deep-sea regions of the Black Sea (Vedernikov & Demidov, 1993;Bologa, 1986;Demidov, 2008).…”

Section: Discussion Temporal Trends In Chl-a and Ppmentioning

confidence: 99%

“…Historic studies of primary production from 1960-1991 reported values of 570-1200 mgCm -2 d -1 along the NW shelf, 320-500 mgCm -2 d -1 along the continental slope, and 100-370 mgCm -2 d -1 in deep-sea regions of the Black Sea (Vedernikov & Demidov, 1993;Bologa, 1986;Demidov, 2008). Primary production for the southern Open ocean areas of the Black Sea experience Chl-a maxima during autumn and winter and minima during the summer (Vinogradov et al, 1999). Mean Chl-a in the open Black Sea from 1978-1991 was reported to be 0.97-1.52 mgm -3 during winter and 0.28-0.38 mgm -3 during summer (Vedernikov & Demidov, 1993).…”

Section: Discussion Temporal Trends In Chl-a and Ppmentioning

confidence: 99%

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Ağırbaş¹,

Tilstone²,

Feyzioglu³

2017

Turk. J. Fish. Aquat. Sci.

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A 12-year time series of SeaWiFS chlorophyll a (Chl-a), primary production (PP), sea surface temperature (SST), and meteorological wind speed were used to examine decadal changes in these parameters in the eastern and western Gyres of the Black Sea. In both Gyres, low wind speeds and SST led to higher PP. After 2004, there was a progressive decrease in PP and Chl-a, which co-varied with increasing SST. Chl-a and PP were significantly higher in the western Gyre compared to the eastern Gyre, especially from 1998 to 2004. Wind speed negatively correlated with PP in both Gyres, but the higher wind speed prior to relaxation in the western Gyre led to higher PP during spring and autumn. Variability in annual PP in both Gyres was coupled to fluctuations in the Multivariate ENSO Index (MEI), which affected the wind regime more in the eastern than in the western Gyre. The data suggest that localised wind regimes in the western gyre that are uncoupled from MEI, sustains higher PP in this area.

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“…Structural and functional characteristics of the phytoplankton are closely related to the intensity of eutrophication, and can be used as indices for determining the state of the phytoplankton community in the Black Sea (Vinogradov et al, 1999). Therefore, tracing temporal variations in chlorophyll a (Chl a), an acceptable indicator of phytoplankton biomass, is necessary in order to reliably identify changes induced by human activity or by natural fluctuations.…”

Section: Introductionmentioning

confidence: 99%

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Edi̇ger¹,

Beken²,

Feyzioglu³

et al. 2015

Turk. J. Fish. Aquat. Sci.

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Benthic macroinvertebrates, macroalgae and phytoplankton constitute the Biological Quality Elements (BQE) proposed in the Water Framework Directive (WFD, 2000/60/EC) to be used for the classification of the ecological status of a water body.Chlorophyll-a is a usefull expression of phytoplankton biomass and this indicator is an effective and relevant BQE for coastal ecosystems which is universally accepted. In the present study, interpretations of the class boundaries according to normative definitions of WFD, are presented for chlorophyll-a in South Eastern (SE) Black Sea. Water quality classification was determined in five different categories as "high, good, moderate, poor and bad". The coastal waters of SE Black Sea were classified in 8 different typologies (K1-K8) based on depth, salinity and substratum types. In this study, types K1 and K2 (>17.5 salinity, >30 m depth) were considered because of availability of time-series data for those typologies. Sinop and Sürmene sites were selected due to the best available long-term chlorophyll-a data set, respectively over the period of 2002-2010 and 2001-2011 for chlorophyll-a respectively. Type specific chlorophyll-a (Chl-a) reference and threshold values were determined based on the 90th percentile of the long-term collected chlorophyll data set. Due to the high seasonal variability of phytoplankton biomass, the annual values were not considered adequate and the classification tool was developed on seasonal basis. The High/Good (H/G) and Good/Moderate (GM) boundaries were defined as seasonal from the long term data sets for Sürmene and Sinop sites. All the boundaries were higher at the Sinop site.Ecological quality ratios distributed between 0-1. It would be necessary to underline the fact that these class boundaries might be higher for waters where depths are below 30 m and salinity values are less than 17.5. However, there is not enough data to support this assumption for the near coast waters of the SE Black Sea. Eventhough Chl-a scaling can not be used as a single tool for the ecological quality classification it is a reliable approach to use the obtained boundaries at temporal and spatial scales for the quality classification of SE Black Sea waters above 30 m depth.

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Temporal (Seasonal and Interannual) Changes of Ecosystem of the Open Waters of the Black Sea

Cited by 24 publications

References 8 publications

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