458 research outputs found
A new sea-nettle from the Eastern Mediterranean Sea: Chrysaora pseudoocellata sp. nov. (Scyphozoa: Pelagiidae)
No full textMutlu, Erhan, Çağatay, I. Tulay, Olguner, M. Tunca, Yilmaz, Hasan Emre (2020): A new sea-nettle from the Eastern Mediterranean Sea: Chrysaora pseudoocellata sp. nov. (Scyphozoa: Pelagiidae). Zootaxa 4790 (2): 229-244, DOI: https://doi.org/10.11646/zootaxa.4790.2.
Impact of using thiocolchicoside during endoscopic ureteral calculi removal: A preliminary study
No full textAtes, Erhan/0000-0002-9677-5673;WOS: 000366731000005PubMed: 26174074
Multi-period scenario generation to support portfolio optimization:
No full textStochastic Programming (SP) models are widely used for real life problems involving uncertainty. The random nature of problem parameters is modeled via discrete scenarios, which makes the scenario generation process very critical to the success of the overall approach. In this study we consider a portfolio management problem and propose two scenario generation algorithms and a SP model to support investment decisions. The main objective of the scenario generation algorithms is to infer representative probability values to be assigned to the scenario realizations sampled from historical data.
The first algorithm assigns the probabilities by using similarity scores, assigning higher probabilities to the scenarios with data paths that are relatively similar to historical paths, where similarity scores are computed by means of distance measures. We first implement this approach using the weighted Euclidean distance (WED). We also propose a new distance measure to obtain similarity scores as an alternative to WED.
The second scenario generation algorithm is based on the combination of moment-matching technique and the Exponential Generalized Auto-Regressive Conditional Heteroskedasticity (EGARCH) model. Scenario probabilities are assigned such that the first four moments of the sampled returns are fit to target moments through a linear programming model, where the second target moments are set to be conditional on the past scenarios on the scenario tree using the EGARCH model. An additional set of constraints are proposed to increase robustness.
The generated scenarios become input to the SP model to restructure the existing portfolio such that the expected final wealth is maximized and the risk exposure is controlled through constraining Conditional Value-at-Risk at each decision epoch on the scenario tree. We finally propose a generic approach to reduce potential losses and implement it on a logistic regression framework.Ph.D.Includes bibliographical references (p. 216-220)by Erhan Deni
The social issues in novels of Hikmet Erhan Bener
No full textSosyal Bilimler Enstitüsü, Türk Edebiyatı Bölümü, Türk Dili ve Edebiyatı Ana Bilim Dalı, Yeni Türk Dili ve Edebiyatı Bilim DalıHikmet Erhan Bener'in Romanlarında Toplumsal Konular adlı tezde yazarın hayatı, edebî kişiliği ve romanları objektif bir şekilde incelendi. Tezin başlığı Romanlarda Toplumsal Konular olmasına rağmen nesnel bir inceleme olabilmesi için yazarın diğer eserleri de tarandı.Sanata ve edebiyata yatkın bir aile içinde yetişen Bener'in edebiyat dünyasına yolculuğu şiirle (Sesler) ve öyküyle (Küçük İstasyon) başlamıştır ve ilk eserlerinin yayınlanması için gerekli maddi desteği babasından almıştır. Edebiyata şiir ve öyküyle başlayan yazar asıl ününü romancılığıyla kazanmıştır. Yeni Türk Edebiyatı sahasında romancı kimliği ile tanınan yazarın deneme, öykü, tiyatro, anı-öykü, anı türünde eserleriyle, mesleği olan maliye alanıyla ilgili eserleri ve çevirileri de vardır. Bener, edebiyat sahasında yazmaya ara verdiği 1966-1975 yılları arasında maliye alanındaki kitaplarını yazmıştır.Romanlarında insanı merkeze alan yazar, her yönüyle insanı anlatır. İnsan, sosyal ve ruhsal durumuyla, siyasal anlayışıyla onun romanlarının en önemli öğesidir. Amacı her yönüyle insan gerçeğini yansıtmaktır. Her fırsatta ?Roman bir trajedidir? diyen yazar bu sözüyle roman anlayışını özetlemektedir. Bu, insanın varoluşuyla ilgili, psikolojik, sosyal ve siyasal trajedisidir. O romanlarında bireyi bütün boyutlarıyla ele alır; yani Bener'in romanlarının arka planında bütün boyutlarıyla insan vardır. Erhan Bener'in romanlarına baktığımızda İkinci Dünya Savaşı yıllarından bugüne kadar Türkiye'nin siyasal, sosyal değişimlerini, bu değişimlerin bireydeki yansımalarını görmek mümkündür; buradan yola çıkarak eserlerinin yazıldıkları dönemlerin zihniyetini taşıdığı anlaşılır. Bener'in eserlerinde, onun kurgu süzgecinden geçerek gelen ?Türkiye'nin Panoraması?, ?Türkiye'nin Gerçeği? beraberinde insanın siyasal, sosyal ve ruhsal panoraması, gerçeği ortaya çıkar.Türkiye ile birlikte Dünya'daki ve Avrupa'daki siyasal-sosyal değişme ve gelişmeler, olaylar, bunların insan üzerindeki etkileri Bener'in romanlarında var olan bir gerçektir. Ortadakiler romanı bunun en güzel örneğidir. Atom bombasının kullanılması, Stalin'in ölümü Sovyet Rusya'nın durumu ve Türkiye'deki siyasi-sosyal olaylar (6/7 Eylül Olayları, Köy Enstitüleri'nin durumu), bunların ?Dokuzlar Çetesi? olarak adlandırılan gençler üzerindeki ve tabii ki Türkiye'deki etkileri vardır.Erhan Bener'in romanlarının arka planında onun toplumcu düşünce yapısının ipuçlarını görmek mümkündür. Olay-zaman-mekân ve kahraman unsurlarını olay örgüsü içine yerleştirirken kendi toplumsal düşünce anlayışını da verir. Yazar siyasal, sosyal, psikolojik ve felsefi yaklaşımlarını sergilerken çeşitli kurgu ve anlatım tekniklerinden yararlanır.Aydının ve küçük burjuvazinin açmazlarını, çıkmazlarını da eserlerine yansıtan yazar Yalnızlar romanında büyük kentlerden küçük bir kasabaya gelen bir grup aydının mekân-ruh çatışmasını, kendi dar çerçevelerinde boğulmalarını, Baharla Gelen'de aydının kendi içinde sorgulamasını; siyasal, sosyal, ruhsal sıkıntılarını, topluma karşı kendi kendini eleştirmesini ele alır. Ölü Bir Deniz, Ortadakiler, Işığın Gölgesi romanlarında da farklı şekillerde aydının problemlerini görmek mümkündür. Bu problemler bazen ruhsal, bazen sosyal ve siyasal problemlerdir.Hemen hemen bütün edebî türlerde ve meslekî alanla ilgili eserler veren, değişik anlatım yöntemleri ve kurgu teknikleri kullanan Erhan Bener, bireyden yola çıkarak insanın, toplumun evrensel sorunlarına eğilir.In the thesis titled The Social Issues in Novels of Hikmet Erhan Bener, the life of the author, his literary character and his novels are objectively studied. Although the title of the thesis is The social Issues in his Novels, the other works of the o the author are scanned for an abjective study.The journey of the author-grown up in a family inclined to fine arts-to literature set off with poetry (Sesler) and story (Küçük İstasyon) and he provided the financial support for publishing his first pieces form his father. The author, dealing with poetry and story as a first step to literature, gained his real fame with his novels. The author, famous for his novels in Contemporary Turkish Literature, also has other works; essays, stories, plays and vocational books and translations related to his real job financ. Bener, wrote his books in the field of finance when he made a pause in writing in the field of literature.The author concentrating human in his novels, reflects human in every aspect. Mankind, with his social and psychological mood, political, views, is the most important element of his novels. His aim is to reflect the reality of human in every aspect. The author, who says that ?Novel is a tragedy? at every turn, summarizes the perception of novel with this saying. This tragedy is the human tragedy; his existence,psychological, social and political tragedy. He deals with human in every aspect in his novels, the humanbeing with his every aspect in his novels, that?s to say in the background of Bener?s novels the humanbeing with his every aspect in his novels, that is to say; ın the background of Bener?s novels, the human being with his all aspects, stands. When we examine the novels of Erhan Bener, it is possible to observe the political and social changes and developments in Turkey, form World War II until now and the individual reflection of these changes and developments. It is understood that is novels reflects the mentality of the period those works are written. In Bener?s works it appears that the political, social and psychological panorama and reality of human being along with the panorama and reality of Turkey is strained from the filter of fiction.The social and political changes and development in the World and Europe along with Turkey, and their effects on human being are the reality of Bener?s novels. The novel Ortadakiler is the most presenting one of this view. The use of atomic bombs, the collapse of the Nazi Empire, Establishment of United Nations, death of Stalin, the condition of Soviet Russia and the social and political events in Turkey (the events in 6/7 September, the state of the Rural İnstitutes) and their effects on the young group called as Dokuzlar Çetesi and the effects on Turkey are all reflected in this novel.It is possible to see the clues of the author?s socialist views in the background of Erhan Bener?s novels. While locating the event, time, place and heroes in setting of the event, he puts forward his perception of social thoughts. While the author ıs reflecting his political, social psychological and philosophical approaches, he uses variour expression and fiction techniques.The author reflects the problems and dilemma of the Intellectual an bourgeoise to his works; in the novel Yalnızlar he mentions about a group of intellectuals moved to a small town form big cities and the conflict of place and spirit, In Baharla Gelen he mentions about the intellectual questioning himself in innerside and his political, social, spiritual problems and autocriticizing. Also in Ölü Bir Deniz, Ortadakiler, Işığın Gölgesi it is possible to see the problems of the intellectual in various types. These problems are sometimes spiritual, sometimes political or social.The author, who has written mostly in every literary types and professional areas and used various expression methods and fiction techniques, deals with the unıversal problems of the individual and society while examining the human
The life, art and works of Erhan Bener
No full textIn our thesis named as The Life, Art and Works of Erhan Bener, we aimed to search and examine author's life, artist personality and works with a objective- scientific consideration. Erhan Bener, who grew in an intellectual family, began to do with literature by writing poems, then went on with stories and novels. Though he gained fame with his novels and his memory-story style work, Bürokratlar, he wrote stories, theaters and essays. He got a lot of awards with his novels, stories and theatres and many works of him were adapted for the movies. In addition Bener wrote ten books concerning finance when he made a break for literature works between 1966 and 1975.,In bis novels, Erhan Bener exposed the human reality by giving importance to psychological elements. "Novel is a tragedy" word summarizes Bener's novel conception and his novel's main problematic is "existence". He considered this problematic in three different ways. In his first five novels {Acemiler, Yalnızlar, Loş Ayna, Kedi and Ölüm ile Baharla Gelen) he exposed existence pains in the individual's interior world. He wrote his books in this period with a parallel expression to subjects that was handled by Existentialists, hi the second period, which began with Elifin Öyküsü, he reflected the individual's personality that was formed by social factors and difficult situation which they got into against the society. His well known novels like Oyuncu, Böcek, Ortadakiler are the example for this preference. In his novels Tekilleşme, Dönüşler and Köleler ve Tutkular he scrutinized the reasons of human being philosopicaHy. While scrutinizing the human being and cause-effects of human behaviours, he used some scientific approaches too. Some ideas of Freud, Jung and Nietzche came up in various event paths in his novels. He always fictionalized the individual in social realities and his view focused on the individual's interior world. Almost in his every novel, Bener, depending on realistic aesthetic, exposed the complicated structure taking it's source from the clash between the individual's personality supressed by society and his interior world in various expression methods and techniques. Novel in novel in Oyuncu, diary in Elifin Öyküsü, detective fiction in Loş Ayna ve Sisli Yaz are the examples of method variety in his novels. Besides this fictions variety, Bener used many various expression techniques to expose his novel characters' interior world. mclining to publish story books when he was in 63, Bener began to write stories in the early stages of his authorship. He has been writing stories since 1945 and he narrates life sections based on instant emotions and thoughts in most of his stories. In his long stories, which are less in number, he draws near to novel in point of volume, intensity and expression. Erhan Bener, who shows a versatile author personality by using very different expression ways, conduced towards psychological novel which was begun by Mehmet Rauf. In his works the individual's adventure advancing and transforming since 1940s can be observed. Key words.: Erhan Bener, psychological novel, existence, new literature.Erhan Berter, Hayatı, Sanatı ve Eserleri başlıklı tezimizle, yazarın hayatını, sanatçı kişiliğini ve eserlerini nesnel-bilimsel bir anlayışla araştırıp incelemeyi amaçladık. Entelektüel bir aile ortamında yetişen Erhan Bener, edebiyata şiirle başlamış, öykü ve romanla devam etmiştir. Daha çok romanlarıyla ve Bürokratlar adlı anı- öyküsüyle tanınan yazar, öykü, tiyatro oyunu, deneme gibi edebî türlerde de ürün vermiştir. Roman, öykü ve oyunlarıyla pek çok ödül kazanan yazarın kimi eserleri de sinemaya uyarlanmıştır. Bener, edebiyatla ilgili çahşmalarınn yanı sıra edebiyata uzun bir süre ara verdiği dönemde (1966-1975) maliye ile ilgili on eser yazmıştır. Erhan Bener, romanlarında insan gerçeğini psikolojik öğeleri ön plânda tutarak dile getirmiştir. "Roman bir trajedidir." sözüyle roman anlayışını özetleyen Bener' in romanlarının ana sorunsalı "varoluş" tur. Yazar, bu sorunsalı romanlarında üç farklı yönelimle ele almıştır. İlk beş romanında (Acemiler, Yalnızlar, Loş Ayna, Kedi ve Ölüm ile Baharla Gelen) bireyin içsel dünyasındaki varoluş sancılarım sergilemiştir. Bu dönemde yazdığı eserlerde varoluşçuların işlediği konulara paralel bir anlatım vardır. Elifin Öyküsü ile başlayan ikinci döneminde ise, bireyin sosyal ve toplumsal etkenler altmda biçimlenen kişiliği ile toplum karşısındaki açmazım dile getirir. Oyuncu, Böcek, Ortadakiler gibi tanınmış romanları bu yöneliminin örnekleridir. Bener, Tekilleşme, Dönüşler ile Köleler ve Tutkular romanlarında ise, insanın varlık nedenleri üzerine felsefî irdelemeler yapar.Yazar, romanlarında insanın varoluşu ve davranışlarının neden-sonuçlan üzerine irdelemeler yaparken çeşitli bilimsel yaklaşımlara da yer vermiştir. Freud, Jung ve Nietzche'nin kimi düşünceleri, çeşitli olay örgüleri içinde onun romanlarında yer alırlar. Romanlarında bireyi hep toplumsal gerçeklikler içinde kurgulayan yazarın bakışı insanın iç dünyasında yoğunlaşmıştır. Gerçekçi estetiğe bağlı olan Bener, bireyin toplum tarafından baskılanan kişiliği ile onun iç dünyası arasındaki uyuşmazlıktan kaynaklanan karmaşık yapıyı hemen her romanında farklı anlatım yöntem ve teknikleriyle karşımıza çıkarır. Oyuncu 'da roman içinde roman, Elifin Öyküsü'nde günce, Loş Ayna ve Sisli Yaz'da. polisiye roman kurgusu, onun romanlarrmn yöntem çeşitliliğini gösteren örneklerdir. Bener, bu kurgu çeşithliğinin yam sura, roman kişilerinin iç dünyasını sergilerken çok çeşitli anlatım tekniklerini de başarıyla kullanmıştır. 63 yaşında iken öykü kitabı yayımlamaya yönelen Bener' in öykücülüğü yazarlığının ilk dönemlerinde başlamıştır. 1945 yılından bu yana öykü yazan Bener, öykülerinin çoğunda anlık duygu ve düşünce yoğunluklarına dayanan yaşam kesitlerine yönelir. Sayıca az olan kimi uzun öykülerinde de hacim, yoğunluk ve anlatım açılarından romana yaklaşır. Eserlerinde birbirinden çok farklı anlatım biçimleri kullanarak çok yönlü bir yazar kimliği ortaya koyan Erhan Bener'in edebiyatımızda Mehmet Rauf la başlayan psikolojik roman türüne önemli katkıları vardır. Onun eserlerinde 1940'h yıllardan günümüze uzanan süreçte gelişip dönüşen bireyin serüvenini izleyebiliriz Anahtar Sözcükler: Erhan Bener, psikolojik roman, varoluş, yeni edebiya
From data to bench to bedside: therapeutic targets in breast cancer
No full textUnderstanding individualized breast cancer treatment options can help physicians care for their patients by careful selection of personalized therapies. The first steps towards this goal have already been taken by clinicians, with the frequent use of molecular and genetic biomarkers to classify breast cancer into categories which direct treatment. This thesis will propose new therapeutic targets for different breast cancer subtypes, as well as a new set of biomarkers that more efficiently predict hormone resistance in estrogen positive (ER+) breast tumors. A novel methodology for therapeutic target prediction will be proposed, based on a new paradigm called “gene centrality”. In addition to being over-expressed, good therapeutic targets should have a high degree of connectivity in the tumor network. Gene centrality encompasses this concept by measuring the connectivity of genes in a network in which each edge is weighted by the level of over-expression of the target gene. Using this method, a series of high centrality SRC proto-oncogenes (LYN, YES1, HCK, FYN, and LCK) were identified in subsets of Basal-like and HER2+ breast cancers. The hypothesis that YES1 is a therapeutic target in breast cancer was experimentally tested. We found that Basal-like breast tumor cell lines showed a significant decrease in fitness upon silencing the expression of YES1. Another validated therapeutic target in breast cancer is the estrogen receptor ESR1, targeted by drugs such as Tamoxifen. However, a significant fraction (~30%) of ER+ cases doesn’t respond well to this therapy. A novel outlier analysis method was applied to gene expression data from ER+ breast cancer patients to identify genes highly associated with Tamoxifen resistance. These included cell cycle genes as well as several chromosomal amplification sites. In addition to the well known HER2 amplicon on 17q12, we discovered that amplicons in 8q24.3, 8p11.2 and 17q21.33-q25.1 correlate strongly with early distant metastasis and poor long term survival. As independent biomarkers for Tamoxifen resistance, together these chromosomal regions are predictive for ~75% of patients that suffer early disease relapse.Ph.D.Includes bibliographical referencesIncludes vitaby Erhan Bila
Intracavity optogalvanic spectroscopy for radiocarbon analysis with attomole sensitivity
No full textCarbon-14 (radiocarbon) is a naturally occurring radioactive isotope of carbon, having an extremely low natural abundance in living organisms (14C/C ~ 10-12) and a long half life of ~ 5730 years. These properties make it an ideal organic tracer for various applicationsin biological, pharmaceutical and environmental sciences as well as carbon dating. Today, the state of the art radiocarbon quantitation technique is Accelerator Mass Spectrometry (AMS) which is based on ion counting using a several megavolt tandem electrostatic accelerator as a mass spectrometer. Although AMS sets the standard for high sensitivity detection, its size, cost and complexity as an analysis system, limits its wide and routine use especially in laboratory or field applications. In this thesis, a new ultrasensitivelaser based analytical technique that can quantify attomoles of 14C in submicrogram samples is demonstrated. The new system exhibits similar or bettermeasurement capabilities as AMS, in sensitivity (14C/C ≤ 10-15), precision (≤3%) and accuracy (≤5%). Additional advantages include non destructive analysis capability, small size, being a table top instrument, high sample throughput capability via flow processingand the potential to be coupled to GC/LC instrumentation.The developed Intracavity Optogalvanic Spectroscopy (ICOGS) system is based on measuring changes in electrical properties of a weakly ionized glow discharge placed inside the cavity of a periodically modulated high power (50 W) 14CO2 laser. This new configuration enabled improvement of the signal detection sensitivity by about six orders of magnitude compared to the conventional external cell optogalvanic spectroscopymethod. The signal enhancement mechanism is similar to, but with key differences from the well studied optical detection method Intracavity Absorption Spectroscopy (ICAS). Measurement capability of this new system is demonstrated with calibration curvesrelative to AMS measurements with a dynamic range of more than five orders of magnitude. The systems studied exhibited saturation effects with laser power andmeasurement time and also non-linearities in response with samples having enrichments greater than 12 Modern. (1 Modern = 1.10-12 14C/12C ratio.) However, standard operating procedures were developed for accurately measuring unknown samples. For a more thorough quantitative understanding of the enhancement mechanism, a physical rate equations model has been outlined.Ph.D.Includes bibliographical references (p. 88-93)by Erhan Ilkme
Ecological distribution of semi-demersal fishes in space and time on the shelf of Antalya Gulf
No full textIn this study we provide a baseline data on semidemersal fish assemblages and biology in a heterogeneous and yet less studied portion of the shelf of Antalya Gulf. The distribution of fish abundance in three transects subjected to different fisheries regulations (fishery vs non fishery areas), and including depths of 10, 25, 75, 125, 200 m, was studied between May 2014 and February 2015 in representative months of winter, spring, summer and autumn seasons. A total of 76 fish species belonging to 40 families was collected and semidemersal species distribution was analyzed in comparison with the whole community. Spatial distribution of fish was driven mainly by depth and two main assemblages were observed: shallow waters (10-25; 75 m) and deep waters (125-200 m). Significant differences among transects were found for the whole community but not for the semidemersal species. Analysis showed that this was due to a strong relation of these species with local environmental characteristics rather than to a different fishing pressure over transects. Firstly all species distribute according to the bathymetrical gradient and secondly to the bottom type structure. Semidemersal species were then found more related to zooplankton and suspended matter availability. The main morphological characteristics, sex and size distribution of the target semidemersal species Spicara smaris (Linnaeus, 1758), Saurida undosquamis (Richardson, 1848), Pagellus acarne (Risso, 1827) were also investigated
İzmir Körfezi’nin (Ege Denizi) Farklı Sektörleri Boyunca Bulunan Epimegafaunanın Dağılımının Ekolojik Yönelimi
No full textDuring 2009-2010 epifaunal materials were collected seasonally with a beam trawl from seven fixed stations in the infralittoral of Gulf of Izmir to study spatiotemporal distribution of megabenthic fauna and their ecology. A total 153 megafaunal species were identified belonging to nine phyla, comprised mostly of 54 molluscans, 43 chordates (mostly fish), 20 arthropods, and 18 echinoderms. Nine alien species were recorded. Four species (two fish species, one gastropod and one Asteroidea species) were constant species and 16 species were common species in the study area. Lesueurigobius friesii, Buglossidium luteum, Turritellinella tricarinata and Astropecten irregularis were the most frequently occurred, and Lesueurigobius friesii, Varicorbula gibba, Anomia ephippium, Turritellinella tricarinata and Dentalium sp were the most abundantly occurred species. Excluding the evenness index, faunistic characteristics tended to increase as a factor of depth. Seasonal density (abundance and biomass) was minimal in April and maximal in February, followed by November having 2-fold higher abundance than that inJuly. Faunal assemblages were correlated with regions of the gulf and habitat type. Buglossidium luteum overspread the entire gulf excluding the inner gulf. Varicorbula gibba and Fulvia fragilis, a pollution indicator predominated the inner gulf. Hydrographical parameters and depth were associated to dictate faunal assemblages with difference among the sectors and habitats.Dağılımlarını ve ekolojilerini çalışmak için 2009-2010 yılları içerisinde İzmir Körfezinin infralittoral zonunda yer alan 7 ayrı ve sabit tutulan derinliklerden epifaunal materyalleri kirişli trol ile mevsimsel toplanmıştır. 9 filuma ait toplam 153 tür bulunmuştur ve bunların bir çoğu 54 tür Mollusca, 43 Chordata (çoğu balık türü), 20 Arthropoda ve 18 to Echinodermata filumlarına ait bulunmuştur. 9 tür yabancı tür olarak tespit edilmiştir. Dört tür (2 balık, 1 gastropod ve 1 Asteroidea türü) bölge için kalıcı ve 16 tür yaygın tür olarak tahmin edilmiştir. Lesueurigobius friesii, Buglossidium luteum, Turritellinella tricarinata ve Astropecten irregularis bölgede en sık, ve Lesueurigobius friesii, Varicorbula gibba, Anomia ephippium, Turritellinella tricarinata and Dentalium sp en bol bulunan türlerdir. Düzenlilik indeksi hariç, diğer faunistik karakterler deniz tabani derinliği ile artış eğilimdedir. Mevsimsel bolluk ve biyokütle Nisan ayında minimum ve Şubatta maksimum iken, bunu Temmuz ayındaki değerlerden iki katı değere sahip Kasım ayı takip etmiştir. Fauna topluluğu, körfezin bölgeleri ve habitatları ile ilişkili bulunmuştur. Buglossidium luteum iç bölge hariç körfezin her yerine yayılmıştır. Organik kirlilik göstergesi olan Varicorbula gibba ve Fulvia fragilis iç körfezde oldukça baskındır. Körfezin farklı bölgeleri ve dip yapısı yanında, hidrografik ve dip derinliği farklı faunal topluğun oluşumuna neden olmaktadır
Recent Occurrence of Rare Echeneis naucrates from the Turkish Mediterranean Coast
No full textOne specimen of live sharksucker was caught with a bottom trammel net in Taşucu Bay, south-eastern coast of Turkey, at 1 m depth on May, 2021. Meristic parameters were determined by fin ray counts and metric parameters were measured from the photos of the specimen. Excluding the recent record in Antalya Gulf, previous records of this species occurred later than May, generally in July in the Mediterranean Sea as well as in the Aegean Sea. The biometrical measurements were different in Taşucu Bay compared to those caught from the Aegean Sea and the central Mediterranean Sea (Tunisian and Sicilian waters), but relatively similar to those reported from Croatia. Major discriminative variables, albeit less significant in individuals from the central Mediterranean, were the number of anal, pectoral and dorsal fin rays. Numbers of suction disc laminae were higher in individuals from the central Mediterranean Sea and New Zealand than those from the Turkish coasts (all 21 disc laminae). The statistical analyses (Principal Component and Discriminant analyses) affirmed successful use of meristic parameters to differentiate the biometric characteristics of the species from the Aegean Sea, the central and eastern Mediterranean Sea. The length-weight relationship showed that the species had a negative allometric growth
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