Browsing by Author "Yavuzatmaca, Mehmet"
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Item Correlational patterns of species diversity, swimming ability and ecological tolerance of non-marine ostracoda (Crustacea) with different reproductive modes in shallow water bodies of agri region (Turkey)(Taylor & Francis, 2019-01-01) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya; Yılmaz, Ozan; Çelen, Ebru; Dere, Şükran; Dalkıran, Nurhayat; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; 0000-0002-1222-8809; 0000-0002-6780-1270; ABE-6749-2020; 6508318183; 35606877400A total of 52 ostracod taxa (35 live spp. 17 subfossils) were collected from 70 shallow aquatic bodies with 11 different habitat types in Agri province (Turkey). Fabaeformiscandona acuminata is a new record for the Turkish ostracod fauna while 29 species were new for the province. Three types of habitats (stream, ditch and pond) contained the highest numbers of 24, 15, 11 species, respectively. Species were clustered into four main groups based on their distribution among habitats. Canonical Correspondence Analysis was able to explain 73.9% of the correlation between the 18 most frequently found species and five environmental variables. Water temperature and elevation were found to be the most effective factors on ostracods. Species with and without swimming setae tend to be found mostly in lentic and lotic habitats, respectively. Besides, species with swimming setae showed relatively higher ecological optimum and tolerance values for pH, electrical conductivity and water temperature than species without setae. The numbers of non-swimmer sexually reproducing species were twice the number of parthenogenetic species. Parthenogenetic species tend to have higher tolerance and optimum values for different environmental variables than sexual species. Results suggest a strong correlation among reproductive modes, swimming ability and ecological tolerances of the species.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.Item Ecological classification of the freshwater Ostracoda (Crustacea) based on physicochemical properties of waters and habitat preferences(Edp Sciences S. A., 2018-07-16) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya; Çelen, Ebru; Dalkıran, Nurhayat; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; ABE-6749-2020; 6508318183The relationship between ecological characteristic of freshwater ostracods and their habitat preferences has been a critical issue for understanding of both current and past aquatic conditions. To evaluate this idea, 121 water bodies with 11 different habitat types were randomly sampled in the province of Kutahya. Water quality measurements indicated high to low (Ca2+ > Mg2+ > Na+) cations and relatively low (SO42- > Cl- > F-) anion concentrations with Ca2+ being the dominant ion. Sixteen of 23 species were new reports for the area. Alpha diversity (H' = 3.64) was found relatively high. Four most abundant species with ca. 93% of similarities contributed highest alpha values in warm to cooler (lower than 25 degrees C), alkaline (pH 8.22), and fresh to slightly brackish waters. Heterocypris sauna and Ilyocypris bradyi also revealed the highest tolerances for electrical conductivity. Based on habitat type, species were clustered into three main groups (I-III). Canonical Correspondence Analyses explained about 57.4% of correlation between species and environmental variables. Redox potential, pH, water temperature and electrical conductivity were found to be the most effective factors on species occurrences while habitat type and dissolved oxygen were not effective. Total number of species showed strong negative and positive relationships with water temperature and dissolved oxygen, respectively. Results clearly showed that cosmopolitan species exhibited relatively wide tolerance ranges to different environmental variables. Accordingly, having wide tolerance ranges seems to provide advantages to cosmopolitan species, increasing their survival chances in a variety of habitats.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.