scholarly journals Taxonomic status of Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) – the Black Sea Flexopecten glaber (Linnaeus, 1758) (Bivalvia: Pectinidae)

2018 ◽  
Vol 3 (4) ◽  
pp. 14-28 ◽  
Author(s):  
I. P. Bondarev
Keyword(s):  
Comparative Analysis ◽  
Black Sea ◽  
Taxonomic Status ◽  
Morphological Data ◽  
Valid Species ◽  
The Black Sea ◽  
Marmara Sea ◽  
History Of ◽  
The Mediterranean ◽  
The Republic

The name Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) is generally used for the only Pectinidae representative inhabiting the Black Sea. It is registered in the Red Book of the Republic of Crimea as endemic subspecies reducing in amount. F. glaber ponticus is listed in WoRMS MolluscaBase as the only accepted subspecies of Flexopecten glaber (Linnaeus, 1758). In the past its taxonomic status has been changed from a geographic variety to valid species. The purpose of this study is to establish its correct taxonomic status. The study is based on a comparative analysis of conchological features of Flexopecten glaber and F. glaber ponticus in relation with the brief natural history of population in the Black Sea. Sampling was performed by snorkel equipment in Kazach’ya Bay (Black Sea, Crimea, Sevastopol) at 2–6 m depths. A total of 100 scallop specimens were sampled in September 2017. To assure a better understanding in a broader context those results are compared with the previously published morphological data based on the analysis of a large amount of material from the Black Sea and the Mediterranean Sea – Marmara Sea regions. Comparative analysis of conchological features of F. glaber ponticus from the Black Sea with F. glaber from the Mediterranean region has not revealed any distinct differences between them. Thus, there are no evidenced data for the diagnosis of F. glaber ponticus as a subspecies. Species F. glaber appeared in the Black Sea not earlier than 7,000 years ago and formed a well developed population less than 3,000 years ago. We have to conclude that the specified divergence period is not long enough to form a subspecies. As a result of the present survey the subspecific status of F. glaber ponticus is not retained and the name is placed in synonymy of the parent species Flexopecten glaber.

scholarly journals Lack of marine entry into Marmara and Black Sea-lakes indicate low relative sea level during MIS 3 in the northeastern Mediterranean

2019 ◽  
Author(s):  
Anastasia G. Yanchilina ◽  
Celine Grall ◽  
William B. F. Ryan ◽  
Jerry F. McManus ◽  
Candace O. Major
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
Global Ocean ◽  
The Black Sea ◽  
Marmara Sea ◽  
Independent Data ◽  
Relative Sea Level ◽  
Mis 3 ◽  
History Of ◽  
Marine Isotope Stage 3

Abstract. The Marine Isotope Stage 3 (MIS 3) is considered a period of persistent and rapid climate and sea level variabilities during which eustatic sea level is observed to have varied by tens of meters. Constraints on local sea level during this time are critical for further estimates of these variabilities. We here present constraints on relative sea level in the Marmara and Black Sea regions in the northeastern Mediterranean, inferred from reconstructions of the history of the connections and disconnections (partial or total) of these seas together with the global ocean. We use a set of independent data from seismic imaging and core-analyses to infer that the Marmara and Black Seas remained connected persistent freshwater lakes that outflowed to the global ocean during the majority of MIS 3. Marine water intrusion during the early MIS-3 stage may have occurred into the Marmara Sea-Lake but not the Black Sea-Lake. This suggests that the relative sea level was near the paleo-elevation of the Bosporus sill and possibly slightly above the Dardanelles paleo-elevation, ~80 mbsl. The Eustatic sea level may have been even lower, considering the isostatic effects of the Eurasian ice sheet would have locally uplifted the topography of the northeastern Mediterrranean.

The Sofia Ministerial Declaration on Black Sea Fisheries and Aquaculture

2019 ◽  
Vol 34 (4) ◽  
pp. 801-822
Author(s):  
Nicola Ferri ◽  
Nilüfer Oral
Keyword(s):  
Black Sea ◽  
Working Group ◽  
The Black Sea ◽  
Management Measures ◽  
History Of ◽  
The Mediterranean ◽  
High Level

AbstractThe General Fisheries Commission for the Mediterranean (GFCM), established in 1949 has always included Black Sea fisheries and in 1976 its constitutive agreement was amended to expressly include the Black Sea. A working group on the Black Sea (WGBS) established in 2011 was instrumental in adopting the first GFCM management measures for Black Sea fisheries. On 7 June 2018, the GFCM organized a High-Level Conference on Black Sea Fisheries and Aquaculture in Sofia which culminated with the signature of a ministerial declaration on Black Sea fisheries and aquaculture. This marked a milestone in the history of cooperation for fisheries among the Black Sea riparian countries.

scholarly journals PONTO-CASPIAN AND MEDITERRANEAN FAUNAL AND FLORAL RECORDS OF UPPER PLEISTOCENE-HOLOCENE SEDIMENTS FROM THE İZMİT GULF (MARMARA SEA, TURKEY)

2021 ◽  
pp. 23-62
Author(s):  
ELMAS KIRCI-ELMAS ◽  
ATIKE NAZIK ◽  
SEVINÇ KAPAN ◽  
ENGIN MERIÇ ◽  
EMINE ŞEKER ZOR ◽  
...  
Keyword(s):  
Black Sea ◽  
Environmental Changes ◽  
The Black Sea ◽  
Marmara Sea ◽  
Mis 3 ◽  
The Mediterranean ◽  
Mollusc Assemblages ◽  
Mis 5 ◽  
Palaeoenvironmental Changes

İzmit Gulf is located between Kocaeli and Armutlu peninsulas at east of Marmara Sea and the interaction area of North Anatolian Fault Zone (NAFZ) and Marmara Graben systems. In this study, the faunal and floral contents (ostracod, foraminifer, mollusc and diatom) of the samples belonging to seven drilling cores were studied and obtained the radiocarbon and optically stimulated luminescence (OSL) age data in order to establish on the Black Sea – Marmara Sea - Mediterranean water connections and palaeoenvironmental changes. The sediments in this study are Late Pleistocene-Holocene aged and only cover the Marine Isotope Stages MIS-5 (interglacial), MIS-3 (an interstadial period between MIS-4 and MIS-2 glacial epochs) and MIS-1. The determination of ostracod and mollusc fauna of the Mediterranean and Ponto-Caspian origin provide important clues to water exchange between the Mediterranean and the Black Sea. Although some Mediterranean originated ostracods occur sporadically with low abundance, absence of foraminiferal fauna and existence of Ponto-Caspian ostracods together with fresh water and cosmopolitan diatom flora indicate that the area strongly interacted with the Black Sea waters during MIS-5. The faunal and floral characteristics of the sediments deposited during MIS-3, clearly denote that the Izmit Gulf was connected with the Black Sea and the Mediterranean Sea at the beginning of MIS-3 (ca. 52.0 - 40.0 ky BP) and the shallow shelf areas were frequently affected by both the Black Sea discharge and Mediterranean input. A thick Holocene sedimentary sequence recovered from the southern Hersek Burnu drilling cores reflects the environmental changes after the latest Black-Mediterranean seas connection. The studied ostracod and mollusc assemblages are mainly characterized by the Mediterranean originated species with a few relict Ponto-Caspian fauna. Also, the benthic foraminiferal assemblages are dominated by normal marine and euryhaline species, reflecting the salinity fluctuations in the Holocene interval.

scholarly journals Genoese Traces in the Black Sea Coast of Turkey’s Forts

X ◽  
2020 ◽  
Author(s):  
Nurhilal Burak
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Historical Documents ◽  
Marmara Sea ◽  
Trade Routes ◽  
Black Sea Coast ◽  
Strong Winds ◽  
The Republic ◽  
Sea Coast

The Black Sea is an interior sea and located between Bulgaria, Romania, Moldova, Ukraine, Russia, Georgia and Turkey. The Black Sea flows through the Bosporus and reaches the Marmara Sea. Strong winds and stream has seen in the Black Sea in most of times in a year. Because of that natural bays were preferred while the ports and settlements were established. Republic of Genoa has started to plan the trade routes that will be carried out on the Black Sea coast since the Treaty of Nymphaeum signed in 1261. The settlements of the Genoese colonies along the Black Sea coast were not simultaneous. From 1266 onwards, there had been a growth of about 200 years. They intervened in some of the defense structures in these ports. They have placed their own coat of arms on the walls of the defensive structures they had built or repaired. The information is obtained about the colonies in these ports from the trade records which kept by Genoese (Massaria di Caffa, Massaria di Pera), the maritime maps (portolans) produced in those centuries and the medieval historians. The scope of this paper is to be examined that between Bulgaria and Georgia borders the Black Sea port of Turkey’s remaining strongholds which Genoese used for trade. Historical documents and maps will be used as well. In the light of these methods, the ports used by the Republic of Genoa on the shores of the Black Sea, established colonies and construction activities in the thirteenth - fifteenth centuries will be examined.

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 Records of Polydora cornuta and Streblospio gynobranchiata (Annelida, Spionidae) from the Black Sea

2013 ◽  
Vol 14 (2) ◽  
pp. 261 ◽  
Author(s):  
V.I. RADASHEVSKY ◽  
Z.P. SELIFONOVA
Keyword(s):  
Mediterranean Sea ◽  
Black Sea ◽  
The Black Sea ◽  
Sea Of Azov ◽  
Soft Bottom ◽  
Diagnostic Characters ◽  
The Sea Of Azov ◽  
Bottom Communities ◽  
History Of ◽  
The Mediterranean

Two spionid polychaetes, Polydora cornuta and Streblospio gynobranchiata, were identified in benthic samples collected in the northern Black Sea and adjacent waters. These species have earlier been classified as the worst invaders in soft bottom communities in the Mediterranean Sea. Polydora cornuta had been previously misidentified and widely reported from the Black Sea and the Sea of Azov as P. ciliata, P. ciliata limicola and P. limicola. Streblospio gynobranchiata is a new invader currently extending its distribution into the Mediterranean, Black and Caspian Seas. Morphology, diagnostic characters and biology of the species are discussed and the history of their records in the Mediterranean, Black and Caspian Seas and the Sea of Azov is reviewed.  

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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