Nehir Kaymak

Yesilirmak Nehrinin yaklasik ucte ikilik bolumu Tokat ili sinirlari icerisindedir. Ayrica cok sayida sulak alan ekosistemini de barindiran ilin bu zenginligi balik cesitliligine de yansimistir. Bu calismada konu ile ilgili literatur ve proje reporlari sentezlenmis ve bunlardan elde edilen veriler degerlendirilmisstir. Bu kapsamda 7 familyaya ait 27 adet balik taksonu (Cyprinidae; Alburnus chalcoides, Alburnus orontis, Alburnoides bipunctatus, Barbus tauricus, Barbus plebejus, Capoeta banarescui, Capoeta capoeta, Capoeta tinca, Capoeta sieboldii ,Carassius auratus, Carassius carassius, Carassius gibelio ,Chondrostoma colchicum, Chondrostoma regium,Cyprinus carpio, Scardinius erythrophthalmus, Squalis cephalus,Nemacheilidae Seminemacheilus spp., Oxynoemacheilus angorae, Siluridae; Silurus glanis, Gobiidae;Knipowitschia caucasica, Percidae; Perca fluviatilis Salmonidae; Oncorhynchus mykiss, Salmo coruhensis, Salmo abanticus, Salmo macrostigma, Atherinidae; Atherina boyeri)tespit edilmi...

Dams interrupt the longitudinal connectivity of rivers by impeding the movement of water, sediments and organisms, which, in turn, could affect aquatic biodiversity and food web ecology. Using stable isotope analysis, we examined spatiotemporal variation in food web structure at four sites in the upper Yeşilırmak River, Anatolia Peninsula, Turkey, in relation to environmental parameters and a dam. It was apparent that the dam created discontinuity in the longitudinal fluvial gradient of fish species richness, with more species observed at upstream sites. Fish assemblages from different sites and seasons occupied distinct areas of isotopic space. Isotopic niche space, trophic diversity, variation in δ13C of basal resources and assemblage redundancy were all higher for the fish assemblage at the site downstream from the dam compared with the site above the dam, a possible indication of greater interspecific dietary variation. Food chain length (the range in δ15N) was lower at the down...

This study analyzed variation in stable isotope ratios of aquatic and terrestrial primary producers and two common cyprinid fishes (Capoeta banarescui and Squalius cephalus) at seven sites in the upper Yes¸ilırmak River Basin, Turkey, to estimate relative contributions of basal production sources to fish biomass. We hypothesized that seasonal and spatial variation in fish assimilation of basal production sources would be affected by hydrological variation, with results for a reach downstream from a reservoir differing from those from upstream sites. Carbon and nitrogen isotopic ratios of primary producers and S. cephalus and d15Nof C. banarescui revealed significant spatial variation. d13C of primary producers, d15N of S.cephalus, and both d13C and d15N of C. banarescui revealed significant seasonal variation. C. banarescui biomass in the river channel was mostly derived from terrestrial herbaceous plants, and its biomass in the reservoir derived mostly from aquatic plants. Estimate...

River impoundments change flow regimes, habitats, and both longitudinal and lateral fluvial gradients that determine how primary production sources are transferred to higher consumers in aquatic food webs. We analyzed carbon and nitrogen stable isotope ratios to examine spatial and seasonal variations of primary production sources supporting two common cyprinid fishes (Capoeta banarescui and Squalius cephalus) in the upper Yeşilırmak River, Turkey. Seven sites in the basin were surveyed during three seasons. We hypothesized that assimilation of alternative basal production sources would be influenced by seasonal flows and location in relation to a dam. Overall, isotopic ratios of basal production sources and fish did not vary significantly between seasons. Assimilation of material derived from riparian vegetation was greater during spring for fish at sites within and downstream from the reservoir. Isotopic ratios of both basal resources and fishes varied significantly in relation to...

Yeşilırmağın ana kolu üzerinde bulunan Almus Baraj Gölü ile barajı besleyen Tozanlı çayı, Çevreli (Muhad) ve Karadere’de yaşayan balık türlerini belirlemek amacıyla yapılan bu araştırma, Ocak 2011 – Ocak 2012 tarihleri arasında gerçekleştirilmiştir. Bu amaçla Yeşilırmak üzerinden belirlenen 10 istasyondan balık örnekleri yakalanmış ve değerlendirilmiştir. Araştırma alanından yakalanan örneklerin değerlendirilmesi sonucu Cyprinidae familyasından Capoeta banarescui, Capoeta sieboldii, Chondrostoma colchicum, Squalius cephalus, Barbus plebejus, Cyprinus carpio, Cyprinus carpio carpio, Alburnus chalcoides, Alburnoides bipunctatus, Carassius carassius; Salmonidae familyasından Oncorhynchus mykiss, Salmo coruhensis; Balitoridae familyasından Seminemacheilus spp., Oxynoemacheilus angorae; Siluridae familyasından Silurus glanis; Atherinidae familyasından Atherina boyeri, Gobiidae familyasından Knipowitschia caucasica teşhis edilmiştir. Bu çalışma ile ilk kez Almus Barajını besleyen Tozanlı ...

Laophontid copepods inhabiting interstitial and phytal habitats in the mediolittoral zone of sandy beaches of the Black Sea Coast of Turkey were investigated. 66 different localities were sampled and 8 species/subspecies were determined. These taxa are: Heterolaophonte uncinata, H. curvata, Klieonychocamptus ponticus, K. kliei adriaticus, Paralaophonte brevirostris, Laophonte setosa, L. elongata triarticulata, Asellopsis sarmatica. Among the 3 subspecies of L. elongata, only L. elongata triarticulata has the 3-segmented P1 exopod in addition to the other differentiating characteristiscs, therefore this subspecies was raised to specific rank as L. triarticulata stat. nov. All taxa identified were recorded for the first time from the study area. Comparison with published marine harpacticoid records from Turkey also revealed that 4 species had not previously been reported from Turkish coastal waters. Türkiye Karadeniz Sahili Laophontidae (Crustacea: Copepoda: Harpacticoida) Faunası Öze...

Aim: The food web structure (trophic chain length and sources of primary production) of Almus Dam Lake was determined with the stable Nitrogen (δ¹⁵N) and Carbon (δ¹³C) isotopes methods. Stable isotope analysis was also used to determine the importance of external and internal carbon sources. Methods: The specimens of fish and invertebrates and primer producers (potential food sources) were collected during January 2011 and September 2012 in Almus Dam Lake which is lacated in Tokat province. It also includes identification process of stable isotope signature of these specimens. We used the SİAR mixing model, which developed by Parnell & et. al (2010), to determine the main sources of primary production supporting the food webs and feeding habits of fishes. The trophic position of organisms is identified by the formula: Results and Discussion: A total of 108 individuals of fish species representing 11 species and one subspecies were analyzed for stable isotopes. The maximum chin lengt...

Both sexes of Heterolaophonte uncinata (Cherniavski, 1868) and H. curvata (Douwe, 1929) are redescribed based on newly collected material from the Black Sea and Mediterranean coasts of Turkey in view of the fact that there has been no detailed redescription since their original descriptions. Neotypes are also designated for both species. Detailed comparisons of the characters displayed among Heterolaophonte Lang, 1948 species reveal that the genus cannot be defined by any unique apomorphy. We propose that the structure of the male appendages, especially the swimming legs, can provide a considerable number of significant characters that are valuable both for taxonomic identification and phylogenetic inferences. In addition, several mistakes leading to a great confusion in the accurate interpretation of the relationships among species within Heterolaophonte are discovered in earlier species descriptions. Therefore, H. rottenburgi (T. Scott, 1912), H. exigua (T. Scott, 1912), H. australis (T. Scott, 1912), and H. insignis (T. Scott, 1914) are removed from the genus and placed as incertae sedis in Laophontidae. We also conclude that H. phycobates (Monard, 1935), H. pygmaea (T. Scott, 1893), H. tupitskyi Chislenko, 1976, and H. curvata micarthros Marcus & Por, 1960, which still need further taxonomic investigation, have doubtful identity within the genus, and we place them as species inquirendae.