Morphometric and genetic analyses on freshwater fish, Pseudophoxinus (Teleostei: Cyprinidae) populations in Turkey

Download
2017
Altun, Ayhan
With exceptional species richness and high level of endemism the Mediterranean region is recognized as one of the most important freshwater biodiversity hotspots in the world. One of the main temperate Mediterranean refugia is Anatolia with high biodiversity and strong genetic imprints. Complex patterns of population structure within the Mediterranean refugia are the results of the existence of fragmented distribution, dispersion process and gene flow occurred during range expansion in the interglacial periods. Pseudophoxinus is a highly diverse and endemic genus among freshwater fish belonging to the family Cyprinidae. The number of species of the genus is 29 of which 21 inhabits the freshwaters of Turkey. Despite the presence of the species in the territories of countries such as Algeria, Azerbaijan, Israel, Jordan, Lebanon, Syria and Tunisia almost 70% of Pseudophoxinus (20 species) is endemic to Turkey. High endemism and diversity of the genus and vulnerability of aquatic ecosystems necessitate thorough studies to be conducted for taxonomic investigation and conservation of the species of the genus. In this study geometric morphometrics and molecular markers, allozymes and microsatellites, were used to determine phylogenetic relationship among 17 populations comprising six species and five populations with undetermined taxonomic status. Pseudophoxinus battalgili represented with four populations, Çavuşçu Lake, Oymapınar Dam Lake, Taşağıl Stream and Suğla Lake was clustered together in the same species complex in all three methods used. While allozyme and microsatellite analyses revealed close relationship between P. hittitorum inhabiting Eflatun Spring and P. battalgili, landmark based geometric morphometrics placed P. hittitorum in a group geographically close to each other. Three populations of P. burduricus were usually grouped together. However, the species complex of P. burduricus obtained from morphometric data included P. fahrettini and P. crassus from İnsuyu Stream as well as Kuğulu Park and Kırkpınar populations. P. egridiri morphologically placed close to P. battalgili. However, both allozyme and microsatellite results showed that this species genetically distinctly singled out from the rest of 16 populations. P. crassus was represented with two populations, Gök Lake and İnsuyu Stream. Although they were genetically found to be closely related, Gök Lake population was the most divergent taxon morphologically. This population recently was revised as a new species, P. iconii.

Suggestions

Stock assessment of the Black Sea anchovy
Tutar, Özge; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
The Black Sea anchovy (Engraulis encrasicolus) is economically the most important fish species in Turkey since it provides 60% of the total fish catch. The Turkish fleet catches 90% of the anchovy stock in the Black Sea due to the anchovy winter migration to the Turkish coast. Over the last 50 years, the Black Sea basin has been subjected to pollution due to human sourced nutrient accumulation in the NW basin via the rivers Danube, Dniester and Dnieper and transportation. The ecosystem has been destroyed by...
A study on cobalt adaptation and memory retention of freshwater bacteria isolates
Çıtır, Gözde; Gözen, Ayşe Gül; Department of Biology (2010)
The mucus-dwelling bacteria previously isolated from the surface of a freshwater fish species (Alburnus alburnus from Lake Mogan, Ankara), were studied to discover their cobalt resistance. The minimum inhibitory concentrations (MIC) were determined for a total of thirty six bacterial isolates. The results of the resistance studies led us to design experiments on adaptation to cobalt and subsequent memory retention. Three selected isolates were exposed to an inhibitory cobalt concentration as a mixed culture...
Current distribution of the small pelagic fish populations in the North Eastern Levantine Sea in relation to environmental conditions and predicting the impacts of temperature rise on their future distributions
Sakınan, Serdar; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
Stocks of traditionally targeted fish species are in decline in the north eastern Levant Sea due to overfishing during recent decades, while catch statistics show a simultaneous increase in landings of commercially less valuable small pelagic species. Moreover, the number of species in the eastern Mediterranean is increasing due to Lessepsian migration and the response of native species to the continuous migration of lessepsian species is in question. Additionally, warming associated with climate change is ...
Genetic structures of salix alba and salix excelsa populations from two major river systems in Turkey
Özdemir Değirmenci, Funda; Kaya, Zeki; Department of Biology (2017)
Salix alba (white willow) is an indicator species and an important component of an healthy riparian ecosystem with great renewable energy potential in Turkey. It is used as one of the most effective phytoremediation tool in the world for river cleaning and ecosystem rehabilitation efforts. Genetic structure of Salix alba populations in two river systems (Göksu and Kızılırmak Rivers) in Turkey were studied with the use of 20 microsatellites markers to provide information for effective conservation and breedi...
Climate change impacts on primary production and economically important fish stocks in the Black Sea
Küçükavşar, Selin; Yılmaz, Ayşen; Ercan, Hakan; Department of Earth System Science (2013)
Coastal urbanization, heavy nutrient/pollutant loads due to intense anthropogenic activities and unsustainable fisheries have been threatening life-support system of marine environment and getting more drastic with the climatic variations and its impacts. Changes in sea surface temperatures and related dynamical processes have been threatening bottom-up / top-down control of marine food webs via variations in primary production and changes in biogeographic and temporal responses of thermophilic species. All...
Citation Formats
A. Altun, “Morphometric and genetic analyses on freshwater fish, Pseudophoxinus (Teleostei: Cyprinidae) populations in Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2017.