scholarly journals Genetic analyses of non-native species Oithona davisae Ferrari F.D. & Orsi, 1984 in the Black Sea

2015 ◽  
Vol 4 (2) ◽  
pp. 91-95 ◽  
Author(s):  
Tamara Shiganova ◽  
Alexandra Stupnikova ◽  
Kremena Stefanova
Keyword(s):  
Black Sea ◽  
Native Species ◽  
The Black Sea ◽  
Genetic Analyses ◽  
Oithona Davisae

Oithona davisae: naturalization in the Black sea, inter-annual and seasonal dynamics, effect on the structure of the planktonic copepod community

2019 ◽  
Vol 59 (6) ◽  
pp. 1008-1015
Author(s):  
A. D. Gubanova ◽  
O. A. Garbazey ◽  
D. A. Altukhov ◽  
V. S. Mukhanov ◽  
E. V. Popova
Keyword(s):  
Black Sea ◽  
Coastal Waters ◽  
Native Species ◽  
Significant Decline ◽  
Acartia Tonsa ◽  
The Black Sea ◽  
Copepod Community ◽  
Oithona Davisae ◽  
Sevastopol Bay

Long-term (20032014) routine observations of zooplankton in Sevastopol Bay (the Black Sea) have allowed the naturalization of the invasive copepod Oithona davisae to be studied in the Black Sea coastal waters. Inter-annual and seasonal variability of the species and their impact on the native copepod community have been analyzed. The invasion of O. davisae and their undoubted dominance in terms of abundance were shown to alter the community structure but, at the same time, the abundances of the native species did not decrease, excepting the Black Sea earlier invader Acartia tonsa. A significant decline in A. tonsa numbers over the stages of O. davisae establishment and naturalization provided evidence of competition between the species. O. davisae have been demonstrated to gain competitive advantage over A. tonsa, that ensured their fast dispersal in the Black Sea, acclimatization in the new habitat and the successful competition over native species.

scholarly journals Feeding of 0-Group Mugilidae Juveniles in the Coastal and Open Waters of the Black Sea near Sevastopol and the Alien Copepod Oithona davisae as Their Diet Component

2017 ◽  
Vol 10 (1) ◽  
pp. 106-113
Author(s):  
Irina V. Vdodovich ◽  
◽  
Antonina N. Khanaychenko ◽  
Vitaly E. Giragosov ◽  
◽  
...  
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Oithona Davisae

scholarly journals The first unified inventory of non-native fishes of the South Caucasian countries, Armenia, Azerbaijan, and Georgia

2021 ◽  
pp. 32
Author(s):  
Tatia Kuljanishvili ◽  
Levan Mumladze ◽  
Bella Japoshvili ◽  
Namig Mustafayev ◽  
Shaig Ibrahimov ◽  
...  
Keyword(s):  
Black Sea ◽  
Fish Species ◽  
Caspian Sea ◽  
Native Species ◽  
Biological Diversity ◽  
Native Fish ◽  
The Black Sea ◽  
The South ◽  
In The Wild ◽  
Native Fishes

The South Caucasus (SC) region is recognized for its high biological diversity and various endemic animal taxa. The area has experienced many fish introductions over the years, but the overall information about non-native fishes in the three SC countries, Armenia, Azerbaijan, and Georgia did not exist. Although these three countries belong to the Kura River drainage, Caspian Sea basin (only the western half of Georgia drains into the Black Sea), the legislative framework for each country regarding introduction of non-native fish species and their treatment is different and poorly developed. The goal of the present study was to make an initial inventory of non-native fish species in the three SC countries, and summarize the existing knowledge as a basis for future risk assessment models and formulation of regional management policies. Here, we present a unified list of 27 non-native species recorded in the wild in Armenia, Azerbaijan, and Georgia. Among these 27 species, eight were translocated from the Black Sea basin to the Caspian Sea basin. Out of these 27 non-native fishes, 15 species have become established (three of them being considered invasive) and six fish species could not survive in the wild.

Oithona davisae: Naturalization in the Black Sea, Interannual and Seasonal Dynamics, and Effect on the Structure of the Planktonic Copepod Community

Oceanology ◽  
2019 ◽  
Vol 59 (6) ◽  
pp. 912-919
Author(s):  
A. D. Gubanova ◽  
O. A. Garbazey ◽  
E. V. Popova ◽  
D. A. Altukhov ◽  
V. S. Mukhanov
Keyword(s):  
Black Sea ◽  
Seasonal Dynamics ◽  
The Black Sea ◽  
Copepod Community ◽  
Planktonic Copepod ◽  
Oithona Davisae

scholarly journals ZOOPLANKTON OF THE NORTH-EASTERN PART OF THE BLACK SEA OFF THE COAST OF TAMAN IN THE SUMMER-AUTUMN PERIOD 2018–2019

2021 ◽  
Vol 49 (1) ◽  
pp. 26-36
Author(s):  
N.P. Remizova
Keyword(s):  
Black Sea ◽  
Taxonomic Composition ◽  
The Black Sea ◽  
Mnemiopsis Leidyi ◽  
Autumn Period ◽  
The North ◽  
Oithona Davisae ◽  
Invading Species ◽  
North Eastern ◽  
North Eastern Part

The taxonomic composition and quantitative characteristics of zooplankton in the northeastern part of the Black Sea near the Taman coast in the summer-autumn period of 2018–2019 were studied. Zooplankton was represented mainly by eurythermic and thermophilic forms. All the discovered species and taxa are currently typical of the Black Sea, including the invading species: copepods Acartia tonsa, Oithona davisae, and combtails Mnemiopsis leidyi, Beroe ovata. The average number of zooplankton in 2018 ranged from 2.7–15.9 thousand copies/m3, the biomass – 0.02–0.14 g/m3; its indicators in 2019; they were lower, respectively, 2.0–5.6 thousand copies/m3 and 0.02–0.07 g/m3. These indicators were within the values recorded earlier, in 2013–2014. A significant part of the coastal zooplankton is meroplankton, which accounted for 5–69% of the population and 4–47% its biomass. O. davisae dominated amoung copepods. This speciest was leading in numbers in both years except June 2019. Despite the similarity of the taxonomic composition of zooplankton, the dominant species in terms of biomass differed by month in two years.

scholarly journals Identification of some common food items in the guts of fish larvae and juveniles in the Black Sea

2017 ◽  
Vol 2 (1) ◽  
pp. 3-10 ◽  
Author(s):  
I. V. Vdodovich ◽  
A. N. Khanaychenko ◽  
A. D. Gubanova ◽  
E. A. Kolesnikova ◽  
L. O. Aganesova
Keyword(s):  
Black Sea ◽  
Fish Larvae ◽  
Cyclopoid Copepod ◽  
Annual Number ◽  
The Black Sea ◽  
Stages Of Development ◽  
Zooplankton Community Structure ◽  
Larvae And Juveniles ◽  
Oithona Davisae ◽  
Chitin Fragments

Over the past decade the positive trends in the average annual number of fish larvae and in the copepod population dynamics in the coastal area of the Black Sea agree. The increased fish larvae abundance is hypothesized due to improvement of their nutrition associated with the drastic increase in number of introduced invasive cyclopoid copepod Oithona davisae. This assumption is difficult to be verified through fish gut content analysis in absence of methodology allowing prey species identification from their fragmentary residual remnants. Our paper offers an original approach to identification of several common copepod prey using specific distinctive features detected on their chitin fragments from guts of fish larvae and juveniles. To identify specific features of the common species from the coastal areas off Sevastopol (Acartia tonsa, Oithona davisae, Longipedia sp., Cyclopina sp.), alive copepods were isolated from the samples and reared as monospecific cultures in laboratory. Images of alive copepods of each species at successive stages of development and their moulted exoskeletons were compared with the images of chitin remnants found in the fish guts. This technique discloses relatively intact specific morphological features remaining undigested in chitin fragments of prey. These species-specific taxonomic features are suggested to be used for trophic analysis of the Black Sea fishes at early stages of development. Application of proposed method is helpful for assessment of qualitative and quantitative composition of consumed prey and selectivity of fish, especially during the changes in zooplankton community structure affecting significantly survival of fish generations.

scholarly journals Short-term variation of metazoan microzooplankton in a coastal area of the Black Sea: the regularities and determining factors

2017 ◽  
Vol 2 (1) ◽  
pp. 56-65
Author(s):  
S. A. Seryogin ◽  
E. V. Popova
Keyword(s):  
Species Diversity ◽  
Black Sea ◽  
Coastal Area ◽  
Diversity Index ◽  
Seawater Temperature ◽  
The Black Sea ◽  
Short Term ◽  
Species Diversity Index ◽  
Oikopleura Dioica ◽  
Oithona Davisae

To many fishes, including commercially valuable species, metazoan microzooplankton (MMZP) are the essential prey ensuring survival of their larvae and juveniles. For the Black Sea dependence of the variability of MMZP abundance and structure on hydroclimatic factors (seawater temperature, wind force and direction, etc.) in the coastal area was not earlier studied over as short periods of time as days to weeks; hence this investigation is of high relevance. Samples of MMZP were collected daily in the mouth of Sevastopol Bay and the adjoining open-sea area from 13 May to 21 June 2013, the period when the quantity of MMZP began growing (spring-summer increase). The samples were taken from the sea surface by a 10 l plastic sampler, condensed in the laboratory by reverse filtration and processed in a Bogorov chamber under the microscope MBS-9. Increased crustacean fraction in which copepods dominated suggested growing abundance of the zooplankton with warming of the sea. This main, temperature-dependent, trend was modulated by short-term changes in the force and direction of wind launching quantitative and qualitative re-distribution of MMZP in the surface layer. Different behavioral responses the plankters showed to the wind-induced water turbulence can be a part of the re-distribution machinery. Contributors to the species diversity were largely the naupliar and early copepodid stages of genera Acartia, Oithona, Paracalanus, Centropages, the nauplii and copepodites of Harpacticoida, bivalve and gastropod veligers, larvae of the tunicate Oikopleura dioica, the nauplii of barnacles, and the larvae of polychaetes. The zooplankton assemblage structure changed in two phases: one, with moderately high values of species diversity index, was prior to, and the other, with low estimates, during the outbreak of the invasive copepod Oithona davisae. 

scholarly journals History of the studying of fauna of Ponticus decapods

2016 ◽  
Vol 1 (1) ◽  
pp. 93-101 ◽  
Author(s):  
S. E. Anosov ◽  
S. M. Ignatyev
Keyword(s):  
Species Composition ◽  
Black Sea ◽  
Native Species ◽  
The Black Sea ◽  
The Past ◽  
History Of

The history of the decapods crustaceans study in Pontus region over the past two centuries is described by analysis based on the source literary. The description shows how researcher’s attitudes at the composition and origin of the fauna of the Black Sea have changed over the time. The contribution of non-native species in biodiversity of decapods region is estimated. The results of the modern revision of the species composition of these crustaceans are made.

DISTRIBUTION OF ALIEN ZOOBENTHIC SPECIES ON THE SHELF OF THE BLACK SEA

2021 ◽  
Vol 14 (4) ◽  
pp. 157-177
Author(s):  
N. N. Shalovenkov
Keyword(s):  
Statistical Analysis ◽  
Species Composition ◽  
Alien Species ◽  
Black Sea ◽  
Native Species ◽  
The Black Sea ◽  
Multivariate Statistical ◽  
Spatial Gradients ◽  
Ecological Barriers ◽  
Danube Region

The number of alien species in the zoobenthos of the Black Sea increased up to 65 species. Depending on the scale of their distribution in the Black Sea, non-native zoobenthos species are combined into three groups: 1) 5 species have spread in the entire sea, 2) 35 species were found in several areas, and 3) 25 species were found only in one of the areas of the sea. Six areas of the Black Sea shelf have been identified (Varna - Burgas, Danube, Northwestern, Crimean, Caucasian and Anatolian) in accordance with the seasonal and annual values of the thermohaline characteristics. The zoobenthos differed not only in quantity, but also in the composition of non-native species between the six areas of the shelf. The results of multivariate statistical analysis revealed a low level of similarity between these areas of the Black Sea shelf. The greatest similarity in the composition of alien species of zoobenthos was observed for the Danube region with the Varna and Burgas bays, which border each other. The species composition of the alien species of the Caucasian shelf was more similar to the Varna - Burgas and Danube areas than to the neighboring Crimean and Anatolian areas. Spatial gradients of temperature and salinity form hydrological fronts of water masses, which are a kind of ecological barriers and can limit the natural exchange of alien species between shelf areas.

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