Mesozooplankton in the open Black Sea: Regional and seasonal characteristics

Арашкевич, Е. Г.; Stefanova, Kremena; Bandelj, Vinko; Siokou, I.; Kurt, Tuba Terbıyık; Örek, Yesim Ak; Timofte, Florin; Timonin, A. G.; Solidoro, Cosimo

doi:10.1016/j.jmarsys.2013.07.011

Cited by 27 publications

(15 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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: 90%

Controls of Multiple Stressors on the Black Sea Fishery

Oğuz

2017

Front. Mar. Sci.

View full text Add to dashboard Cite

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.

show abstract

Section: Stressor 4: Invasion By Alien Gelatinous Speciesmentioning

confidence: 90%

Controls of Multiple Stressors on the Black Sea Fishery

Oğuz

2017

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…However, variance partitioning in our study showed that the explained percentage of community variation by pollutants alone was larger (13.9%) than that by natural variables (9.8%) alone, indicating that anthropogenic pollutants contributed larger than natural variables to the variation of zooplankton community in the coastal regions of Bohai Sea. In the open seas, natural variables such as ocean current and water temperature may play major roles in structuring zooplankton structure 59,60 . Whereas in semi-closed seas such as Bohai Sea, both higher pollution levels 36,46 and weaker ocean currents 61 may lead to the observed distribution patterns of mesozooplankton communities in the present study.…”

Section: Discussionmentioning

confidence: 99%

Anthropogenic pollutant-driven geographical distribution of mesozooplankton communities in estuarine areas of the Bohai Sea, China

Gao

Yang

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Mesozooplankton communities in marine ecosystems are mainly influenced by both anthropogenic pollutants (e.g. nutrients and heavy metals) and natural variables (e.g. temperature, salinity and geographic distance). To achieve a deeper understanding of the effects of anthropogenic pollutants on mesozooplankton communities, we analyzed the community structure of mesozooplankton from 91 stations representing five typical estuarine regions in the Bohai Sea and assessed the relative importance of anthropogenic pollutants and natural variables by using multiple statistical approaches. Cd was identified as the leading pollutant for observed community variation among the five regions, followed by NH 4 -N and COD. Redundancy analysis (RDA) model demonstrated that mesozooplankton communities were largely determined by both anthropogenic pollutants and natural variables, and the indicator species of mesozooplankton also varied when responding to different factors. Variance partitioning analysis showed both anthropogenic pollutants and natural variables posed significant influences (ANOVA, P < 0.05) on the mesozooplankton community structure, but the explanatory power of anthropogenic pollutants overrode the natural variables. These observations highlighted the importance of anthropogenic pollutants in the shifts of zooplankton structures among different regions. Our results obtained in this study provided new insights into the mechanism of the influence of anthropogenic pollutants on mesozooplankton communities in estuarine areas.

show abstract

“…This study constitutes a first attempt to compare the Nansen, Juday and WP2 nets, which were (and probably still are) used mostly in the Black Sea (see Kovalev et al, 1977;Konsulov, 1990;Besiktepe & Unsal, 2000;Vinogradov et al, 1992;Stefanova et al, 2012;Arashkevich et al, 2014) and the Baltic Sea (see Hernroth, 1987;Johansson et al, 1993;Flinkman et al, 1998;Ojaveer et al, 1998;Kornilovs et al, 2001;Mollmann et al, 2005). The effort was based on tests performed for a variety of parameters (abundance, biomass-total and per size classes-, taxonomic composition), for nets with the same shape and mouth diameter, but with different mesh size (Juday with 150, 180 and 200 µm mesh size), and for nets with different shape, mouth diameter and length, but the same mesh size (Juday-200 vs WP2-200), as well as for nets with different shape and mesh size.…”

Section: Discussionmentioning

confidence: 99%

“…For copepodite stages, the taxonomic keys by Dolgopolskaya et al (1969) and by Sazhina (1969) were used. Biomass values, as wet weight, were estimated based on the number of individuals and the individual weight given per taxon and size class in Arashkevich et al (2014). Parasagitta setosa and Pleurobrachia pileus biomass values were not included in the estimation of total biomass, because their high values "skewed" the size fractionation of biomass considerably.…”

Section: Methodsmentioning

confidence: 99%

Intercomparison of five nets used for mesozooplankton sampling

et al. 2015

View full text Add to dashboard Cite

Intercomparison of nets commonly used for mesozooplankton sampling in the Black and Mediterranean seas was attempted within the SESAME (Southern European Seas: Assessing and Modelling Ecosystem Changes) project. Five nets were compared: three Juday nets equipped with 150 μm, 180 μm and 200 μm mesh size, a Nansen net (100 μm mesh size) and a WP2 (200 μm mesh size). Replicated samples were taken at one station in the western Black Sea offshore waters in April 2009. The samples were analyzed at species level (except for meroplankton), stages (for copepods) and body length was measured for all organisms. A decrease of total abundance values was observed with increasing mesh size, due to the significantly higher numbers of animals smaller than 1 mm in the samples obtained using fine mesh size rather than with coarser nets. Few comparisons were revealed significant as regards the abundance of 1-2 mm long animals, while no significance was detected for specimens larger than 2 mm. The above differences resulted in discripancies between nets as regards species and stage composition. Biomass values did not differ significantly between nets, due to the important contribution of the large animals (Calanus euxinus) to total biomass. The smallest and the largest animals revealed high variability between replicates collected using the Nansen, Juday-200 μm and WP2 nets. Correction factors were calculated for the conversion of abundance values between each pair of nets. The differences observed between nets regarding abundance and biomass, community taxonomic composition and size structure, as well as the estimated correction factors, provide useful information for the harmonization of data obtained using the above nets in the Black Sea.

show abstract

Mesozooplankton in the open Black Sea: Regional and seasonal characteristics

Cited by 27 publications

References 35 publications

Controls of Multiple Stressors on the Black Sea Fishery

Controls of Multiple Stressors on the Black Sea Fishery

Anthropogenic pollutant-driven geographical distribution of mesozooplankton communities in estuarine areas of the Bohai Sea, China

Intercomparison of five nets used for mesozooplankton sampling

Contact Info

Product

Resources

About