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Öğe Assessing age, growth, and reproduction of Alburnus mossulensis and Acanthobrama marmid (Cyprinidae) populations in Karakaya Dam Lake (Turkey)(Turkish Journal of Zoology, 2015) Alkan, Aysel Uçkun; Gökçe, DidemAbstract: In total, 626 individuals of Alburnus mossulensis and 586 individuals of Acanthobrama marmid were collected monthly from Karakaya Dam Lake on the upper Euphrates River. The gonadosomatic index, somatic condition, oocyte size, and fecundity were calculated on a monthly basis. Reading of scales indicated that the maximum age was 4+ years for A. mossulensis and A. marmid. The estimated length weight relationships were W = 0.206 × FL2.065 for females and W = 0.119 × FL2.138 for males in A. mossulensis, and W = 0.029 × FL2.678 for females and W = 0.030 × FL2.631 for males in A. marmid. Growth in length equations were Lt= 19.6[1 e 0.14(t + 1.39)] for females and Lt= 20.1[1 e 1.40(t + 1.04)] for males in A. mossulensis and Lt= 17.3[1 e 1.37(t + 1.04)] for females and Lt= 16.6[1 e 1.29(t + 1.04)] for males in A. marmid. This study investigated oocyte size and fecundity for A. mossulensis and A. marmid in Turkey for the first time. The spawning period was between May and August for A. mossulensis and between May and June for A. marmid. These 2 species usually play a key role in the food web of temperate freshwater systems. In addition to water quality, biological data of these 2 species are very important in terms of future water management of the basin of Karakaya Dam Lake.Öğe Evaluation of vertical and horizontal changes in community structure of zooplankton in a deep dam lake(Turkish Journal of Zoology, 2014) Gökçe, Didem; Özhan, Duygu TurhanÖz (İngilizce): The purpose of this study was to describe the horizontal and vertical distributions of the zooplankton community structure in Karakaya Dam Lake. Rotifers were numerically dominant (81.89%) in the community during the study period; they were followed by Copepoda (10.32%) and Cladocera (7.79%). In the metalimnetic maximum oxygen zone between 5 and 10 m, cladocerans made up 70.1% of the total number of zooplankton in June and 27.3% of the total number of zooplankton in November. Oxygen values decreased at 10 and 15 m in September and November. While the abundance of rotifers and cladocerans decreased as well, cyclopoids increased (60% of total zooplankton at 10 m). Nitrogen and soluble reactive phosphate were at low concentrations. Relationships among zooplankton, abundance, and environmental factors were analyzed using the unweighted pair-group method using arithmetic averages (UPGMA) and canonical correspondence analysis (CCA). UPGMA cluster analysis was used to illustrate unimodal species distribution by classification into 2 groups. Eigenvalues of axes clarified 42.7% of the cumulative variance in species data and 62.9% of the relationship between species and environmental data in the CCA. Many zooplankton species, rather tolerant to different environmental conditions, are good indicators for water quality and can be used for the biomonitoring of water ecosystems.Öğe Little Known Aspects of Aquatic Insects: Myiasis(2022) Gökçe, DidemAmong invertebrates, Diptera, an aquatic insect, has the largest group of species. Aquatic Diptera larvae live in a highly distinctive environment in contact with vertebrates, humans, contaminated water, and depositing eggs in the host organism due to their life cycle. This study aims to describe various aspects of Clogmia albipunctata one of myiasis insects causing a disease that affects both living and dead vertebrates as well as humans and whose symptoms are often overlooked. Furthermore, the study is remarkable since it is the first report of C. albipunctata (Psychodidae) in an indoor drainage system, except for humans, vertebrates, and natural ecosystems. SEM images gave a detailed description of the larvae and confirmed the species identification. When their life cycles were investigated, it was determined that in addition to myiasis, C. albipunctata larvae (drain fly or moth fly) played a vital role in the movement of bacteria from drains to indoor places, such as toilets, bathrooms, showers, and kitchens. Multi-drug resistant bacteria populate C. albipunctata, which possesses synanthropic behavior, and may play a major role in its transmission. This study focused on accidental myiasis.Öğe Synanthropic Clogmiaalbipunctata Causing Urogenital and Gastrointestinal Myiasis(2020) Gökçe, DidemAbstract: Being a synanthropic cosmopolitan fly of tropical origin, Clogmia albipunctata is an aquatic species that is commonly found in moisture-rich places such as inside a house, sewage treatment plants, and hospitals. C. albipunctata can cause urogenital, intestinal, and even nasopharyngeal accidental myiasis under non-hygienic conditions or if a person consumes substandard food. Its larvae enter the human body via bodily cavities such as rectum, genitalia, or urinary canal, thereby leading to the development of infestation. This can in turn cause haematuria, bloody stool, vomiting and fever, with the appearance of larvae in urine and faeces. Here, we present the case of a 43-year-old woman with infection in the urogenital and gastrointestinal systems by the fourth instar larvae of C. albipunctata. To the best of our knowledge, this is the first report of myiasis caused by this species in Turkey. This study will provide general information about the biology of this species and methods to recognize it.Öğe Temporal and spatial variations of zooplankton community and biochemical response due to water quality in a Deep Dam Lake (Turkey)(2022) Gökçe, Didem; Özhan Turhan, DuyguIn this study, the zooplankton community and its relationship with environmental factors were investigated in the Karakaya Dam Lake (KDL). The physico-chemical characterization showed that there were obvious changes in the water quality and zooplankton population structure, which was mainly due to the organic matter source. Reactive phosphate (SRP) and nitrogen values were found in low concentrations. A total of 22 zooplankton taxa were determined, including 14 taxa of Rotifera, followed by 6 taxa of Cladocera and 2 taxa of Copepoda. The most abundant species were Synchaeta oblonga (Rotifera), Bosminia longirostris (Cladocera), and Cyclops scutifer (Copepoda). The abundance of zooplankton was highest in spring. Canonical correspondence analysis (CCA) was used to examine relationships between measured environmental variables and zooplankton composition. According to CCA, dissolved oxygen, and SRP values, there was a significant relation to zooplankton abundant with these factors. The triplots diagram demonstrated variations of the structure of zooplankton population composition which can be explained by the environmental variables. Oxidative stress (catalase, glutathione S-transferase, glutathione reductase) and neurotoxicity (acetyl cholinesterase) biomarkers were analyzed in copepod species. Glutathione reductase and acetyl cholinesterase activities were significantly inhibited in the summer. Catalase activity was induced in the spring. The seasonal changes of biomarker indicated that the KDL may be at risk of pollution that originated from agricultural and industrial activities.