Person: DERE, ŞÜKRAN
Loading...
Email Address
Birth Date
5 results
Search Results
Now showing 1 - 5 of 5
Publication Do reproductive modes and swimming ability influence occurrence of non-marine ostracod (crustacea) species among aquatic habitats?(Zoological Soc Japan, 2019-12-01) Kulkoyluoğlu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet; Celen, Ebru; Dere, Şükran; Dalkıran, Nurhayat; DERE, ŞÜKRAN; DALKIRAN, NURHAYAT; ABE-6749-2020; CNS-5761-2022To gain a better understanding of the effect of reproductive modes and swimming ability on ostracod distribution, we visited 111 randomly selected aquatic sites in Kirsehir province. A total of 35 ostracods were newly reported for the area. The number of species with and without swimming setae was not statistically different, but numbers of sexual species was significantly lower than parthenogenetics. Species without setae did not show a significant difference between sexual and parthenogenetic forms. Numbers of species with (out) setae were not significant among different elevational ranges. Distribution of parthenogenetic species was common in all 11 habitat types when sexual species were only found from three different types located from 690 to ca. 1400 m of elevational ranges. Numbers of parthenogenetic species with or without setae did not show a difference among the ranges, but sexual species without setae exhibited wider distributional ranges (690-1289 m) than species with swimming setae (690-1089 m). Species' co-occurrence revealed two positive, five negative, and 44 random pairs of co-occurrences. Wards cluster analyses portrayed three main clustering groups. While group I includes parthenogenetic and sexual species, group II covers mostly parthenogenetic species with and without setae. Group III consists of species without setae. CCA results displayed three environmental variables (water temperature, pH and elevation) effective on species distribution. Species distributed in all elevational ranges tend to show lower optimum and wider ecological tolerances. Parthenogenetic species with swimming setae and with relatively higher tolerance ranges were dominant over sexual species. The present results suggest that swimming mode has a greater effect on species distribution among the habitats than reproductive modes.Publication Ecological characteristics and habitat preferences of ostracoda (Crustacea) with a new bisexual population record (MSGLA, Turkey)(Aloki Applied Ecological Research and Forensic Inst Ltd, 2020-01-01) Akdemir, D.; Kulkoyluoğlu, O.; Yavuzatmaca, M.; Tanyeri, M.; Gürer, M.; Alper, A.; Dere, Şükran; Celen, E.; Yılmaz, O.; Oezcan, G.; DERE, ŞÜKRAN; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü; CNS-5761-2022In order to compare the ecological characteristics of non-marine ostracods with different reproductive modes, 68 sites including 11 different habitat types were examined in the province of Mugla during July of 2014. A total of 28 taxa were found and 11 of them were new reports for Mugla. Sexual populations of Psychrodromus olivaceus and P. fontinalis were encountered from the same sampling site. Males of the latter species were reported for the first time from Turkey. The female/male ratio of these species was higher at low altitudes while it was about the same at medium altitudes. Numbers of species in sexual and/or parthenogenetic populations with/without swimming setae and individuals in natural and artificial habitats did not show significant difference (P > 0.05). Troughs were described as the richest habitats for ostracods. The first two axes of Canonical Correspondence Analysis explained 66.2% of the relationships between species and environmental variables when the water temperature was the most effective factor on species composition (P < 0.01). Results suggest that type of reproductive modes did not show significant relationship with species distribution among different water bodies. Hence, it seems distribution of species is most probably affected by several biotic and abiotic factors.Publication Effect of habitat type on algal species diversity and distribution at high altitudes(European Regional Centre Ecohydrology Polish Acad Sciences, 2021-02-15) Yavuzatmaca, Mehmet; Akdemir, Derya; Celen, Ebru; Dalkiran, Nurhayat; DALKIRAN, NURHAYAT; Kulkoyluoglu, Okan; Dere, Sukran; DERE, ŞÜKRAN; Karacaoglu, Didem; KARACAOĞLU, DİDEM; Akay, Enis; 0000-0002-1222-8809; 0000-0003-4712-5612; 0000-0002-0398-6763; 0000-0003-1253-3376; B-2635-2019; A-6441-2018To investigate how habitat type influences species diversity and distribution of algae, 115 sampling sites across eight different habitats (stream, spring, lake, pool, wetland, ditch, trough, hot-spring) were randomly sampled from Agri province, Turkey. A total of 392 algal taxa (gamma diversity) were identified, of which 212 taxa (54.08%) belonged to Bacillariophyta while the rest (180 taxa) belonged to seven other groups (Chlorophyta, Charophyta, Euglenophyta, Cyanobacteria, Miozoa, Ochrophyta, and Cryptophyta). 150 taxa were encountered only once. The highest alpha diversity was found in ditches (H' =4.57, 235 taxa) followed by streams (H' = 4.40, 238 taxa), and the lowest diversity was recovered in troughs (H' = 2.62, 42 taxa). Relatively high Whittaker's beta diversity (Bw = 19) indicated a low level of similarity among sampling sites suggesting that no common taxonomic group was solely effective enough to change dominancy level of any species among the habitats. The first two axes of Canonical Correspondence Analysis accounted for 58.1 % of the total variance in the occurrence of 152 algal taxa (all taxa recovered from more than three samples) and described gradients across four environmental variables (habitat type, pH, elevation and water temperature). Ditches significantly contribution to alpha and gamma diversity in the province although they have relatively small surface area and shallow water compared to other habitat types. High alpha diversity in ditches may be related to the positive effect of geographic and climatic factors in mountainous area. Future possibilities are discussed.Publication Seasonal variation of epilithic diatom todurge lake (Sivas)(Ege Univ, 2007-01-01) Sıvacı, E. Rıdvan; Kılınç, Sabri; Dere, Şükran; DERE, ŞÜKRAN; Bursa Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Biyoloji Bölümü.The seasonal variation of the composition and concentration of epilithic flora of diatom from chosen sampling eight station on Todurge Lake have been investigated and compared between November-2000 and November-2001. In addition, some physical and chemical parameters were measured at lake water. Calcium and Sulfate have been based chemical component in area. Although The species of genus Cymbella, Amphora, Cocconeis, Gomphonema, Achnanthes and Fragilaria constitute the main composition of the epilithic flora of Todurge Lake, howewer the species belonging to genus Navicula, Nitzschia, Epithemia, Gyrosigma, Pinnularia and Stauroneis are found to be less numerous. During the study, Cymbella affinis Kutz., Cocconeis placentula var. euglypta Ehr., Achnanthidium minutissimum Kutz. Czar., Amphora commutata Grunow, Gomphonema olivaceum (Hornemann) Breb., Mastogloia braunii Grunow have been the dominant species in whole station of Todurge Lake. The species of whole diatom except Epithemia argus Kutz., Caloneis clevei (Lagerst.) Cleve, Stauroneis anceps Ehr., Surirella minuta Breb., were found very frequently and numerous in the whole station. Generally, total organism in all of station increased in the late spring and early summer and decreased in the late winter and late summer. The richness and diversity indices were determined the highest in T6 station, the lowest in T1 and T7 station.Publication Relative variation of ionic composition in a karstic lake under the theory of unweighted vs weighted logratio analysis(Iwa Publishing, 2008-01-01) Çankaya, Emel; Sıvacı, E. Rıdvan; Kılınç, Sabri; Dere, Sükran; DERE, ŞÜKRAN; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; CMI-4679-2022The use of logratio analysis in limnological studies has proved to be effective for solving the problems of the constrained nature of compositional data. The method offers a graphical tool, the relative variation biplot, to explore relative changes of the ions. However, recent methodological developments have shown that the results can be perturbed by low-valued ions with high variances and proposed downweighting their influences as in correspondence analysis. Additional to all properties of the unweighted version, this weighted logratio analysis extends the previous work and has the advantage of the principle of distributional equivalence.As a motivating application, we chose a karstic lake with dominating ions calcium and sulphate causing other ions to be present relatively in low absolute levels. Besides, one of the collected compositional samples was suspected to be unusual which, in part, contributes to high relative variances. This paper is therefore concerned with the choice of the best method for the analysis of such extremely saline water systems by comparing performances of both unweighted and weighted logratio analyses.We concluded that introducing weights captured more features of ionic relationships with almost all compositional variability explained. We observed that the ratio of calcium to sulphate, ammonium or phosphorus (to a lesser extent) was particularly valuable in understanding the natural chemical process of the lake. A constant log-contrast model based on calcium, ammonium, nitrate and total soluble phosphorus appeared as an equilibrium equation.