scholarly journals Genetic divergence between the scad subspecies Trachurus Mediterraneus (Carangidae, pisces) from the Black Sea and the Mediterranean

2000 ◽  
Vol 1 (1) ◽  
pp. 133 ◽  
Author(s):  
I.S. DOBROVOLOV
Keyword(s):  
Population Structure ◽  
Isoelectric Focusing ◽  
Black Sea ◽  
Aegean Sea ◽  
The Black Sea ◽  
Sea Of Marmara ◽  
Large Form ◽  
Starch Gel ◽  
The Mediterranean ◽  
Nei's Genetic Distance

Analysis of myogen and eleven enzymes (AAT, ADH, EST, GPI, IDHP, LDH, MDH, MEP, PGDH, PGM and SOD) were carried out by using starch gel and isoelectric focusing electrophoresis on thinlayer and ultrathin polyacrylamide ampholine and servalite gels in scad species from the Black Sea, the Sea of Marmara, the Aegean Sea, and the Mediterranean. Data from electrophoretic investigations was used to clarify the population structure of the scad migrating in the Bulgarian aquatory of the Black Sea and consisting of two main subpopulations: a) a "Black Sea" one hibernating in this sea only, and b) a "Sea of Marmara" one hibernating in that sea and contiguous Black Sea regions around the Bosporus. Non-specific muscular esterases were used, because they were appropriate for identification of both subspecies: Trachurus mediterraneus ponticus Aleev and Tr.m.mediterraneus Steindachner. Nei's genetic distance (D=0,0113) was used as an indication of their isolation dated back to the Carangate Period. An attempt was made to check the hypothesis of the origin of "large" ("giant") scad in the Black Sea as a result of the heterozygotic interbreeding between Tr.m.ponticus Aleev and Tr.m.mediterraneus Steindachner. A new allele Est-1E as well as the previously known alleles Est-1A and Est-1-B, were found in Mediterranean scad Tr.m.mediterraneus caught off Nice (France). It's proposed that the presence of the large form of large scat in this area is also a consequence of the heterozytic efect from the interbreeding between a population marked by Est-1-A and Est-1-B and a population marked by Est-1-E, probably inhabiting the waters around Gibraltar in the Atlantic Ocean.

scholarly journals First record of the Combtooth Blenny, Microlipophrys adriaticus (Steindachner & Kolombatovic, 1883) (Pisces, Blenniidae), for the Italian Ionian Sea

Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1646 ◽  
Author(s):  
F. Tiralongo ◽  
R. Baldacconi
Keyword(s):  
Mediterranean Sea ◽  
Black Sea ◽  
Adriatic Sea ◽  
First Record ◽  
The Black Sea ◽  
Ionian Sea ◽  
Sea Of Marmara ◽  
Limited Distribution ◽  
The North ◽  
The Mediterranean

Microlipophrys adriaticus (Steindachner & Kolombatovic, 1883) is an endemic blenny of the Mediterranean Sea. It is also known from the Sea of Marmara and the Black Sea. However, unlike other species of combtooth blennies, M. adriaticus is a fish with a limited distribution in Adriatic Sea, especially in the north, where it can be common. We report here the first record of this species from the waters of the Ionian Sea.

Morphology and Late Pleistocene-Holocene Sedimentation of the Strait of İstanbul (Bosphorus): A review

2021 ◽  
pp. SP523-2021-48
Author(s):  
M. Namık Çağatay ◽  
K. Kadir Eriş ◽  
Zeynep Erdem
Keyword(s):  
Late Pleistocene ◽  
Black Sea ◽  
Aegean Sea ◽  
The Black Sea ◽  
Sea Of Marmara ◽  
Submarine Fan ◽  
Sedimentary Succession ◽  
Muddy Sediments ◽  
Lacustrine Facies ◽  
Irregular Topography

AbstractThe Bosphorus (Istanbul Strait) is natural strait that connects the Black Sea with the Aegean Sea via the Sea of Marmara and Dardanelles Strait. It is a 31 km long and 3.5 km wide winding channel, with an irregular bottom morphology. It has depressions up to -110 m deep, and two sills with depths of -35 and -58 m in the south and north, respectively.Presently, a two-layer water exchange exists through the strait, with the Mediterranean and Black Sea waters forming the lower and upper layers, respectively. The Bosphorus channel extends as shelf valleys on the Black Sea and Sea of Marmara shelves. However, it operated as a river valley or an estuary during the stadial low-stand periods.The infill sedimentary succession of the Bosphorus channel is up to ∼100 m thick above the Palaeozoic-Cretaceous basement with an irregular topography. The oldest sediments are sandy to muddy fluvial-lacustrine facies of late Pleistocene age, which are preserved only in up to -160 m-deep scoured depressions of the basement. They are overlain by mid-late Holocene estuarine-marine shelly sandy to muddy sediments with patches of bioherms and shelly lag deposits.The Bosphorus outlet areas of the Black Sea and Sea of Marmara are characterized by a submarine fan and a shelf valley, respectively. The fan system in the Black Sea started depositing ∼900 yr after the initial vigorous marine water incursion at ∼8.4 14C kyr BP. On the Marmara shelf, extension of the Bosphorus channel is a sinuous shelf valley with a channel-leveé complex, which was deposited by the Black Sea outflow during the 11-10 14C kyr BP. Catastrophic floodings of the Sea of Marmara by torrential Black Sea outflows during the Greenland Interstadial melt water pulses, as well as the strong Mediterranean current towards the Black Sea during the interglacial periods, were responsible for carving the Bosphorus channel and the shelf valleys, as well as removing the sediments belonging to the earlier periods.

scholarly journals New Information on the Hosts and Distribution of the Marine Fish Leeches Trachelobdella Lubrica and Pontobdella Muricata (Clitellata, Hirudinida)

2010 ◽  
Vol 44 (4) ◽  
pp. e-33-e-36 ◽  
Author(s):  
A. Öktener ◽  
S. Utevsky
Keyword(s):  
Black Sea ◽  
Marine Fish ◽  
Aegean Sea ◽  
The Body ◽  
The Black Sea ◽  
Sea Of Marmara ◽  
New Information ◽  
Thornback Ray ◽  
Labrus Bergylta ◽  
First Time

New Information on the Hosts and Distribution of the Marine Fish LeechesTrachelobdella LubricaandPontobdella Muricata(Clitellata, Hirudinida)Fish leeches collected in the Aegean Sea, the Sea of Marmara and the Black Sea were examined.Trachelobdella lubrica(Grube, 1840) was recorded for the first time from the ballan wrasseLabrus bergylta(Osteichthyes, Labridae), marine breamDiplodus vulgaris(Osteichthyes, Sparidae) and the grouperEpinephelus aeneus(Osteichthyes, Serranidae) from aquiculture. The leeches of this species were found in the Aegean Sea and the Sea of Marmara on the body surface, in the mouth and gill cavities of their hosts. Leeches identified asPontobdella muricata(Linnaeus, 1758) were collected from the thornback rayRaja clavata(Chondrichthyes, Rajidae) in the Black Sea.

scholarly journals A Review of the Marine Crab Fisheries in the Turkish Seas

2018 ◽  
Vol 76 (3) ◽  
pp. 125-134 ◽  
Author(s):  
Muzaffer Mustafa Harlıoğlu ◽  
Ardavan Farhadi ◽  
Abdullah Suat Ateş
Keyword(s):  
Black Sea ◽  
Callinectes Sapidus ◽  
Management Strategies ◽  
Aegean Sea ◽  
The Black Sea ◽  
Crab Species ◽  
Sea Of Marmara ◽  
Brachyuran Crab ◽  
Portunus Segnis ◽  
Conservation And Management

Abstract The paper presents a review of the distribution of marine crabs (Brachyura) along the Turkish coast and the amount of economically important marine crabs harvested between 1967 and 2016. Previous records reported that Turkey had 102 brachyuran crab species, only five of them being economically important, but this review identifies two more species, Inachus phalangium and Ashtoret lunaris. The Aegean Sea has more crab species than the Mediterranean, the Black Sea and the Sea of Marmara. The most harvested species are Callinectes sapidus, Maja squinado, Eriphia verrucosa, Carcinus aestuarii and Portunus segnis, respectively. This review shows that there have been fluctuations in the harvest of marine crabs between years, the lowest being 5 tonnes in 2015 and the highest, 2116 tonnes in 1984. The information provided in this review provides a basis for potential profitable development of conservation and management strategies of marine crabs in Turkey.

scholarly journals Assessment of goatfish fisheries in Turkey based on the microdata set of official landing statistics

2021 ◽  
Vol 38 (3) ◽  
pp. 303-309
Author(s):  
Nuray Çelik Mavruk ◽  
Sinan Mavruk ◽  
Dursun Avşar
Keyword(s):  
Mediterranean Sea ◽  
Black Sea ◽  
Large Scale ◽  
Aegean Sea ◽  
Bottom Trawl ◽  
The Black Sea ◽  
Marmara Sea ◽  
Trawl Fishery ◽  
Red Mullet ◽  
The Mediterranean

Although goatfishes (Mullidae Rafinesque, 1815) are among the most important commercial fishes in Turkey, no research has been found investigating the characteristics and spatial patterns of goatfish fishery. Here, we assessed the goatfish fishery of Turkey based on the microdata set of Turkish National Fishery Statistics gathered by Turkish Statistical Institute (TÜİK) between 2014 and 2017. In this context, we investigated the variation of total goatfish catch by cities. In addition, we compared the contribution of small (boat <10m) and large scale (boat >10m) fishers as well as different fishing techniques to the total goatfish catch in Turkey. Finally, an evaluation was made on the discard rates recorded in the official landing statistics. The results showed that higher red mullet (Mullus barbatus Linnaeus, 1758) catch was reported in the eastern Mediterranean, whereas surmullet (Mullus surmuletus Linnaeus, 1758) catch was significantly higher in the western Black Sea. On the other hand, fishery-independent investigations revealed that the Turkish fishery fleet mostly catches red mullet throughout the coasts of Turkey. Therefore, the separate records of red mullet and surmullet in the landing statistics likely represent the local names of red mullet rather than two different species. Large scale fishers were the main source of fishery pressure in the Mediterranean Sea, the Aegean Sea and the Black Sea. However, the majority of the catch was landed by small scale fishers in the Marmara Sea. The bottom trawl fishery landed 88, 92 and 87% of total goatfish catch in the Black Sea, the Aegean Sea and the Mediterranean Sea, respectively. Purse seiners provided the largest part of total goatfish catch (40%) in the Marmara Sea, where the bottom trawl fishery is prohibited. The overall average for the discard rate was found to be 0.47%. There were no statistically significant differences among the discard rates of two species, marine regions or fishing methods.

scholarly journals First recording of the non-native species Beroe ovata Mayer 1912 in the Aegean Sea

2007 ◽  
Vol 8 (1) ◽  
pp. 5 ◽  
Author(s):  
T.A. SHIGANOVA ◽  
E.D. CHRISTOU ◽  
I. SIOKOU
Keyword(s):  
Alien Species ◽  
Black Sea ◽  
Coastal Area ◽  
Native Species ◽  
Aegean Sea ◽  
The Black Sea ◽  
Ballast Waters ◽  
Beroe Ovata ◽  
The Mediterranean ◽  
Atlantic Coastal

A new alien species Beroe ovata Mayer 1912 was recorded in the Aegean Sea. It is most likely that this species spread on the currents from the Black Sea. Beroe ovata is also alien to the Black Sea, where it was introduced in ballast waters from the Atlantic coastal area of the northern America. The species is established in the Black Sea and has decreased the population of another invaderMnemiopsis leidyi, which has favoured the recovery of the Black Sea ecosystem.We compare a new 1 species with the native species fam. Beroidae from the Mediterranean and predict its role in the ecosystem of the Aegean Sea using the Black Sea experience.

scholarly journals The Activity of Ptolemy II’s Fleet in the Aegean Sea

Electrum ◽  
2020 ◽  
Vol 27 ◽  
pp. 131-148
Author(s):  
Tomasz Grabowski
Keyword(s):  
International Relations ◽  
Black Sea ◽  
Aegean Sea ◽  
Balance Of Power ◽  
The Black Sea ◽  
International Conflicts ◽  
Political Relationship ◽  
Sea Power ◽  
The Mediterranean ◽  
Naval Force

Ptolemy I, the founder of the Lagid dynasty, heavily invested in the navy and thus established the Ptolemies as a formidable sea power, his work continued by his successor Ptolemy II Philadelphus, who employed his fleet to pressure lesser powers of the Mediterranean. The following article examines the activity of Ptolemy II’s fleet in the Aegean Sea. At the end of the 270s, Ptolemy II sent a naval expedition to the Black Sea; the operation helped him establish a political relationship with Byzantion and demonstrated that maintaining a naval presence on foreign waters could influence other rulers to favor the Ptolemies. The Ptolemaic fleet under Ptolemy II Philadelphus operated in the Aegean during two major international conflicts, the Chremonidean War and the Second Syrian War. In this article I argue that the surviving evidence on the Chremonidean War indicates that Ptolemy II’s aim was not to subdue Greece or even Macedonia but to maintain the Ptolemaic hold over the Aegean with Egypt’s relatively small naval force under Patroclus. In turn, the outcome of the Second Syrian War led to a considerable weakening of the Lagids’ position in the Aegean. Ptolemy II adroitly cultivated international relations through diplomacy, propaganda, international euergetism and spreading his dynastic cult; sending the Ptolemaic fleet to patrol foreign seas constituted one crucial instrument Philadelphus could employ to shift the Mediterranean balance of power in his favor.

scholarly journals Alien species on the coasts of Turkey

2005 ◽  
Vol 6 (2) ◽  
pp. 119 ◽  
Author(s):  
M.E. CINAR ◽  
M. BILECENOGLU ◽  
B. OZTURK ◽  
T. KATAGAN ◽  
V. AYSEL
Keyword(s):  
Alien Species ◽  
Black Sea ◽  
Aegean Sea ◽  
The Black Sea ◽  
Sea Of Marmara ◽  
Levantine Sea ◽  
Pelagic Environment ◽  
Lessepsian Migration ◽  
Pelagic Ecosystems ◽  
Hard Substrata

The compilation of data on alien species reported from the Turkish coasts yielded a total of 263 species belonging to 11 systematic groups, of which Mollusca had the highest number of species (85 species), followed by Crustacea (51), fishes (43) and phytobenthos (39). The Black Sea is represented by a total of 20 alien species, the Sea of Marmara by 48 species, the Aegean Sea by 98 species and the Levantine Sea by 202 species. The majority of aliens found in the Black Sea and the Sea of Marmara were transported via shipping, whereas the Levantine coast is extensively subjected to Lessepsian migration. Benthic habitats (soft and hard substrata) comprise 76% of the total alien species and the pelagic environment is inhabited by thirty-nine species. Almost 50% of aliens collected from the Turkish coasts were found only at 0-10 m depth. Eight species occur at depths deeper than 100 m. The impacts of aliens on the benthic and pelagic ecosystems are presented.

On Postlarvae and Pelagic Juveniles of Rocklings Gaidropsaurus Mediterraneus and G. Biscayensis

1982 ◽  
Vol 62 (3) ◽  
pp. 647-665 ◽  
Author(s):  
Neclå Demir
Keyword(s):  
Life History ◽  
Black Sea ◽  
Standard Length ◽  
The Black Sea ◽  
Sea Of Marmara ◽  
Larval Stages ◽  
History Of ◽  
The Mediterranean ◽  
Eggs And Larvae ◽  
Pelagic Juveniles

Little is known about the life history of the species of Gaidropsaurus Rafinesque, 1810. Two species of this genus, G. mediterraneus (Linnaeus, 1758) and G. biscayensis (Collett, 1890) = Antonogadus megalokynodon Kolombotovic, 1894 occur in the Sea of Marmara. The egg, larvae and pelagic juveniles of G. biscayensis have never been described. Egg, prelarval and early postlarval stages attributed to G. mediterraneus have been described and illustrated by many workers, but there has been confusion in their identifications.Three species of Gaidropsaurus, G. mediterraneus, G. biscayensis and G. vulgaris (Cloquet, 1824) are recorded from the Mediterranean. Raffaele (1888) made artificial fertilizations of eggs of Naples specimens that he identified as Motella tricirrata Nilsson, 1832 = G. vulgaris. Holt (1899) found some eggs which are similar to those described and figured by Raffaele in the plankton off Marseille, but he considered it impossible to distinguish whether the larvae which hatched out from those eggs were Motella tricirrata i.e. G. vulgaris or Motella mediterranea Lütken, 1882 i.e. G. mediterraneus. Ehrenbaum (1905–9) who re-examined the various records of eggs and larval stages of Gaidropsaurus believes that those figured by RafFaele (1888) and Holt (1899) as well as the larvae referred to Phycis Artedi, 1792 and a pleuronectid by Emery (1886) and Marion (1894) respectively probably belong to Onos (Gaidropsaurus) mediterraneus. Aboussouan (1964) who worked on ichthyoplankton of the Gulf of Marseille also attributed some eggs and larvae to G. mediterraneus and figured one of those postlarvae which is 2·65 mm in standard length.The eggs and prelarval stage of G. mediterraneus have more precisely been described and illustrated by Soviet investigators (Vodyanitskii & Kazanova, 1954; Duka, 1958; Dekhnik, 1973)> from the Black Sea.

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