Long-term changes in nutrient supply of phytoplankton growth in the Black Sea

Mikaelyan, Alexander S.; Зацепин, А. Г.; Часовников, В. К.

doi:10.1016/j.jmarsys.2013.02.012

Cited by 56 publications

(30 citation statements)

References 36 publications

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“…Our findings agree with recent studies which have revealed that the phytoplankton community composition of the Black Sea has shifted substantially during the last three decades due to drastic changes (i.e. eutrophication) in the Black Sea ecosystems, and is numerically dominated by dinoflagellates and coccolithophores (Eker-Develi and Kideys, 2003;Kideys, 1994;Mikaelyan et al, 2011Mikaelyan et al, , 2013Moncheva and Krastev, 1997;Uysal et al, 1998).…”

Section: Discussionsupporting

confidence: 93%

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Spatio-temporal pattern of phytoplankton and pigment composition in surface waters of south-eastern Black Sea

2017

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Section: Discussionsupporting

confidence: 93%

“…In terms of species number, dinoflagellates were found to be the dominant group along the stations in agreement with previous studies (e.g. Agirbas et al, 2015;Mikaelyan et al, 2013) reported from the Black Sea.…”

Section: Discussionsupporting

confidence: 92%

Spatio-temporal pattern of phytoplankton and pigment composition in surface waters of south-eastern Black Sea

2017

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“…In fact, the narrow peripheral zone of the Black Sea appears to be always more productive at all trophic levels than the interior basin. The field observations performed in the northeastern Black Sea (i.e., almost 1,000 km away from the main source of eutrophication) documented relatively high concentrations of phytoplankton and zooplankton species/groups within the shelf-slope zone with respect to further offshore (Vinogradov et al, 2011;Mikaelyan et al, 2013;Arashkevich et al, 2014;Shiganova et al, 2014, and others). The fish eggs and larvae surveys (Niermann et al, 1994;Kideys et al, 1999;Gucu et al, 2016) and abundance and biomass measurements of gelatinous species (Mutlu, 2009) along the southern Black Sea showed their patchy distributions with higher concentrations closer to the coast.…”

Section: Stressor 4: Invasion By Alien Gelatinous Speciesmentioning

confidence: 89%

Controls of Multiple Stressors on the Black Sea Fishery

Oğuz

2017

Front. Mar. Sci.

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Black Sea is one of the most severely degraded and exploited large marine ecosystems in the world. For the last 50 years after the depletion of large predatory fish stocks, anchovy (with the partial contribution of sprat) has been acting as the main top predator species and experienced a major stock collapse at the end of 1990s. After the collapse, eastern part of the southern Black Sea became the only region sustaining relatively high anchovy catch (400,000 tons) whereas the total catch within the rest of the sea was reduced to nearly its one-third. The lack of recovery of different fish stocks under a slow ecosystem rehabilitation may be attributed, on the one hand, to inappropriate management measures and the lack of harmonized fishery policy among the riparian countries. On the other hand, impacts of multiple stressors (eutrophication, alien species invasions, natural climatic variations) on the food web may contribute to resilience of the system toward its recovery. The overfishing/recovery problem therefore cannot be isolated from rehabilitation efforts devoted to the long-term chronic degradation of the food web structure, and alternative fishery-related management measures must be adopted as a part of a comprehensive ecosystem-based management strategy. The present study provides a data-driven ecosystem assessment, underlines the key environmental issues and threats, and points to the critical importance of holistic approach to resolve the fishery-ecosystem interactions. It also stresses the transboundary nature of the problem.

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“…The Black Sea is prone to natural hydrogen sulfide contamination, and oxygen-dependent life forms only exist in its top layer, which has a thickness less than 200 m and is most susceptible to atmospheric impacts (Oguz et al, 2003, Capet et al, 2004, Mikaelyan et al, 2013, Capet et al, 2014. The stress of the ecosystem is aggravated by the fact that the shelf is narrow, with the exception of the NW part; thus, the benthic habitat is small compared to the total Ocean Sci.…”

Section: Introductionmentioning

confidence: 99%

The temporal variability of oxygen inventory in the NE Black Sea slope water

Ostrovskii

Зацепин

Solovyev

2018

Preprint

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Abstract. The time series of vertical profiles of hydrophysical parameters and dissolved oxygen are critical for identifying trends in water column stratification, mixing and ventilation in the Black Sea. Due to global warming, warm winters have recently become common over the Black Sea, and the temperature in the cold intermediate layer (CIL) is increasing. Regular measurements that are as frequent as every 2 h were performed using a moored profiler near the shelf break at a depth of 220 m in the northeastern Black Sea from January to early March 2016 to assess the temporal dynamics of the oxygen inventory 10 over the upper part of the continental slope on timescales from hours to months. The moored profiler was equipped with a sensor suit that included the CTD 52-MP CTD with the fast oxygen sensor SBE43F and the acoustic Doppler current meter Nortek Aquadopp 2 MHz, which allowed for direct observations of the CIL temperature, the pycnocline structure, the current velocity and the oxygen stratification, in particular, the depths of the hypoxia onset. The average oxygen inventory below a depth of 30 m was 24.9 mol m-2. Relatively high/low oxygen inventory cases were related to the thin/thick main 15 pycnocline that was associated with the inshore/offshore location of the Black Sea Rim Current. The pycnocline hindered the vertical transport of oxygenated water to the CIL. The new CIL emerged by horizontal advection above the pycnocline only at the end of the observational survey. The vertical displacements of the hypoxia onset depth ranged from 97-170 m, while the shelf edge depth in this region usually ranges from 90-100 m. Intermittently, the hypoxia boundary depth fluctuated on two time scales: ~17 h due to the inertial oscillations and approximately 5 days due to the current meanders and eddies. 20Further efforts are urgently needed for monitoring the rise of hypoxia onset depth above the shelf break in the Black Sea.

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Long-term changes in nutrient supply of phytoplankton growth in the Black Sea

Cited by 56 publications

References 36 publications

Spatio-temporal pattern of phytoplankton and pigment composition in surface waters of south-eastern Black Sea

Spatio-temporal pattern of phytoplankton and pigment composition in surface waters of south-eastern Black Sea

Controls of Multiple Stressors on the Black Sea Fishery

The temporal variability of oxygen inventory in the NE Black Sea slope water

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