Genetic structure of modern and ancient swordfish populations from coasts of Turkey

Yüncü, Eren
In this study, partial mitochondrial DNA (mtDNA) and 8 microsatellite loci of swordfish collected from Northern Levantine Sea and Northern Aegean Sea were analyzed. Also same mtDNA region of ancient swordfish samples unearthed from Yenikapı excavation were sequenced. Obtained sequences were evaluated comparatively with the sequences from Balearic Sea, Ligurian Sea, Ionian Sea and Southern Aegean Sea, available in databases. Analysis of the molecular variance revealed a significant differentiation between Western (Balearic, Ligurian) and Eastern (Ionian, Southern Aegean, Northern Aegean, and Northern Levantine) Mediterranean. Eastern Mediterranean had lower diversity and lower long term effective population size (Ne) than Western Mediterranean. Generally, migration from Eastern Mediterranean to Western Mediterranean was higher. Ancient DNA (aDNA) population was slightly different from modern populations based on FST. However, continuity between aDNA/ Southern Aegean, aDNA/ Northern Aegean and aDNA/ Northern Levantine could not be rejected. Long term Ne and genetic diversity of aDNA were higher than Eastern Mediterranean and nearly equal to Western Mediterranean. FST, PCA and STRUCTURE results showed Northern Aegean and Northern Levantine were not differentiated based on microsatellites. All short term Ne’s calculated with various methods were less than 150 and MSVAR results showed dramatic Ne reduction in swordfish of both Northern Aegean and Northern Levantine, started 1240 and 599 years ago respectively. Mediterranean swordfish is considered as a single stock and only one conservation plan is offered. According to results, different conservation plans must be implemented for Eastern and Western Mediterranean and Eastern population, harboring the swordfish of Turkish coasts, is at great risk.  


A Study on possible variant forms of anchovy in the black sea
Şahin, Ezgi; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
The anchovy in the Black Sea is a commercially important fish source for Turkey, which is represented by two different subspecies in the basin. Spawning and feeding occurs in northern coasts where food supplies are more abundant. When the water temperature starts to decrease, the anchovy migrate toward the warmer waters of the southern coasts. The schools formed during this migration make them a primary target for fishing fleets. Due to morphological similarities, it is not possible to report the catches by...
Composition of eggs and larvae of fish and macrogelatinious zooplankton in Sinop Region (The Central Black Sea) during 2002
Satilmis, Hasan Huseyin; Bat, Levent; Ozdemir, Zekiye Birinci; Ustun, Funda; Sahin, Fatih; Kıdeyş, Ahmet Erkan; Erdem, Yakup (2006-01-01)
This study was carried out in order to determine abundance and distribution of macrogelatinous organisms (Aurelia aurita, Pleurobranchia pileus, Mnemiopsis leidyi ve Beroe ovata) with respect to fish egg and larvae in Sinop region in 2002. Three stations were selected this region and plankton tows were made both verticallly and horizontally. In study the ctenophores M. leidyi between January and September, and B. ovata between August and December period were appeared. The cnidarian Aurelia aurita and the ct...
Dogan, Gulden; Yılmaz, Aslı; Bagci, Eyup; Kaya, Zeki (2017-12-01)
The phylogenetic relationships of Drosanthe section of Hypericum genus (Hypericaceae) were analyzed by using non-coding chloroplast DNA region (trnL 3'-trnF) for 58 individuals. The section is represented by 23 taxa and nine of which are endemic to Turkey. The chloroplast phylogeny suggested that the members of this section belonged to a polyphyletic group, which imply at least two independent origins. The individuals of this section clearly formed two main clades. One clade included all members of this sec...
MTDNA based genetic diversity of native sheep breeds and Anatolian mouflon (Ovis Gmelini Anatolica)
Demirci, Sevgin; Togan, İnci Zehra; Department of Bioinformatics (2012)
In the present study, history of domestic sheep were investigated by mitochondrial DNA (mtDNA) based haplogroups (HPG) of 628 samples and mtDNA control region (CR) sequences of 240 samples from 13 Turkish sheep breeds which were located in the hearth of the first domestication center. Also, 30 Anatolian wild sheep (Ovis gmelinii anatolica) mtDNA CR sequences were obtained to contribute to the scenarios on initial domestication stages of sheep. Haplogroup compositions of breeds were identified with SSCP meth...
Genetic and physiology of cold and drought resistance in Turkish red pine (Pinus brutia, Ten.) populations from southern Turkey
Kandemir, Gaye Eren; Kaya, Zeki; Önde, Sertaç; Department of Biology (2002)
The purpose of the study was to determine the pattern of genetic variation in morphological and physiological traits associated with cold and drought stress using seedling from over-exploited and natural populations of Pinus brutia Ten. (Turkish red pine) from southern Turkey. To determine the pattern of genetic variation existing in over-exploited and natural populations, seedlings from 6 populations each with 40 families were raised in Ankara forest nursery from 1998-2000. Three of the populations (Yaylaa...
Citation Formats
E. Yüncü, “Genetic structure of modern and ancient swordfish populations from coasts of Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2017.