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Abaza V.,National Institute for Marine Research and Development Grigore Antipa
Journal of Environmental Protection and Ecology | Year: 2010

On the basis of 18 samples collected in 6 stations on three transects at 30 and 40 m depth, the author analysed the status of the benthic communities present there, which proved to be more stable than those in shallow waters. 14 major taxonomic groups with 55 different taxa were present. In term of abundances meiobenthos prevailed, and in term of biomass, molluscs (Mytilus). Among 11 euconstant species, 7 were polychaetes. General ecological status of the area can be characterised as satisfactory.

Gubanova A.,Ukrainian Academy of Sciences | Altukhov D.,Ukrainian Academy of Sciences | Stefanova K.,Bulgarian Academy of Science | Arashkevich E.,RAS Shirshov Institute of Oceanology | And 5 more authors.
Journal of Marine Systems | Year: 2014

This paper reviews the changes in the marine planktonic copepods of the Black Sea species' list from the beginning of taxonomic research to the present day. The study was based on the SESAME biological database, unpublished data, literature and data obtained during the course of the SESAME project. Comparisons were made with the Guidebook for Marine Fauna of the Black Sea and the Sea of Azov, which revealed changes both in the taxonomic status of some species and in the structure of the copepod community. The taxonomic status of two species ( Acartia clausi small form and Centropages kroyeri pontica) and the nomenclature of two species ( Oihona minuta and Calanus helgolandicus) have been changed. Three native species ( Acartia margalefi, Oithona nana, and Paracartia latisetosa) have disappeared. Two non-indigenous copepods ( Acartia tonsa and Oithona davisae) became established in the Black Sea ecosystem in the 1970s and 2000s, respectively. The success of their establishment was determined by biological features of the species and vulnerability of the native copepod community to invasions. It is highly probable that both species were introduced to the Black Sea by vessel ballast water. The hypothesis of "mediterranization" of the Black Sea fauna does not appear to hold true for zooplankton. Numerous claims of alien copepod species in the Black Sea remain largely unverified due to insufficient information. Data on newly discovered species of the Acartia genus are not authenticated. An updated list of marine planktonic copepods of the Black Sea is hereby presented. © 2013 Elsevier B.V.

Radu G.,National Institute for Marine Research and Development Grigore Antipa | Anton E.,National Institute for Marine Research and Development Grigore Antipa
Scientia Marina | Year: 2014

The abundance of the three species of endemic Black Sea marine mammals represented by Delphinus delphis ponticus (Barabasch-Nikiforov 1935), Tursiops truncatus ponticus (Barabasch-Nikiforov 1940) and Phocoena phocoena relicta (Abel 1905) has shown a dramatic decline due to direct killing practiced in earlier times, incidental catches in fishing gears, depletion of the fish populations entering the cetacean food web, and habitat degradation. These threats are more severe in the Black Sea owing to its semi-enclosed nature, high human density, and human activities being carried out especially in coastal zones. Each year, incidental cetacean catches are registered on the Romanian littoral and, consequently, mortalities occur among individuals which strand on the beaches. These mortalities affect in particular the species Phocoena phocoena, considered the most vulnerable one to gillnet fishing. The greatest hazard for Black Sea marine mammals is turbot gillnets, taking into account their number and distribution area. This paper presents data on the description of the current fishing system used in the commercial fisheries of the Romanian Black Sea area, the geographical distribution of the incidental catches, fishing effort, IUU fishing and ghost fishing, CPUE values of cetacean by-catches, indirect impacts of fisheries and recommendations. © 2014 CSIC.

Micu D.,National Institute for Marine Research and Development Grigore Antipa | Nita V.,National Institute for Marine Research and Development Grigore Antipa | Todorova V.,Bulgarian Academy of Science
Aquatic Invasions | Year: 2010

The Japanese shore crab Hemigrapsus sanguineus is recorded for the first time from a Black Sea locality: Tomis Marina in Constanţa, Romania. The suggested vector of introduction is as adults in the hull fouling of yachts. The species has not established and salinity requirements for larval development make it unlikely that it will ever establish in the Black Sea. © 2010 The Author(s).

Lazar L.,National Institute for Marine Research and Development Grigore Antipa | Gomoiu M.-T.,Romanian National Institute of Marine Geology and Geoecology GeoEcoMar | Boicenco L.,National Institute for Marine Research and Development Grigore Antipa | Vasiliu D.,Romanian National Institute of Marine Geology and Geoecology GeoEcoMar
Geo-Eco-Marina | Year: 2012

The paper presents the distribution of the Total Organic Carbon (TOC) in the surface layer sediments of the Black Sea Romanian shelf, since September 2009 to September 2010. The study is based on the analysis of samples from 21 stations. The results have led to the following conclusions: the TOC content in the surface sediments revealed values in the range "undetectable" up to 14.94% (mean 3.38%, median 3.28%, standard deviation 2.70%). The values generally highlighted a gradient increasing with distance from the shore and, at the same time, nearby the Danube's mouths, with the fine sediment fractions increase. Statistically, the TOC content of the stations under the direct influence of the river discharge was significantly higher in 2010 than 2009, due to the historical raised flow of the Danube. The spatial and temporal distribution of TOC content showed also high values in the Constanta area, in late summer, due to the increased river discharge in 2010, algal blooms and the anthropogenic influence of the wastewater treatment plants.

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