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Öğe Distribution and ecology of Ostracoda (Crustacea) from troughs in Turkey(2013) Külköylüoğlu, Okan; Akdemir, Derya; Sari, Necmettin; Yavuzatmaca, Mehmet; Oral, Ceren; Başak, ElifTroughs are artificially transformed natural springs, underground waters, or related habitats. Some effects of such transformation are mentioned in a few studies, but there has been no extensive study on species composition and diversity in troughs. To contribute to the knowledge on the ostracods in troughs, we examined ostracod composition and diversity in 105 troughs from 6 provinces (Bolu, Erzincan, Gaziantep, Kahramanmaraş, Ordu, Van) in Turkey. The troughs were randomly visited between the years 2006 and 2010. A total of 32 ostracod species and a mean number of 2.16 species per trough were found. The most common 4 species (Heterocypris incongruens, Ilyocypris bradyi, Psychrodromus olivaceus, Candona neglecta) occurred in 57, 48, 34, and 26 different troughs, respectively. A UPGMA dendrogram displayed these 4 species in the same clustering group. The first 2 axes of canonical correspondence analysis explained about 69.5% of the variations in the species data set between 15 species and 5 environmental variables. The 2 most important explanatory variables, altitude (P 0.008, F 2.389) and redox potential (P 0.034, F 2.230), were the 2 most effective factors on species occurrence in these troughs. Ecological tolerance and optimum estimates of cosmopolitan species were generally higher than the mean values. The ShannonWiener index showed high values for the 4 most common species, supporting the effect of their dominance. Our results suggest that troughs can have relatively high ostracod richness but evenness can be low due to the strong dominance of one or more species.Öğe Distribution of sexual and asexual Ostracoda (Crustacea) from different altitudinal ranges in Ordu region, Turkey(2011) Sari, Necmettin; Külköylüoglu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet; Altinbag, CerenIn order to understand the relationship between altitude and reproductive modes (a/ sexual) of non-marine ostracods, 166 randomly selected sites were sampled from 11-16 July, 2010. Total of 26 species was found from 133 out of 166 sites. Except two species (Cypridopsis vidua, Heterocypris incongruens), the other 24 species were new reports for the region. Three species (Psychrodromus olivaceus, H. incongruens, and Candona neglecta) were occurred most frequently as 43, 46 and 76 times, respectively. Numbers of asexual species (19) were higher than the sexual (11) but there was no significant differences (P > 0.05) observed between the frequencies of these forms at different altitudinal ranges. Canonical correspondence analyses did not correlate species' reproductive modes to a certain environmental variables measured when four variables (Habitat type (p = 0.014; F = 2.171); Water temperature (p = 0.018; F = 2.248); pH (p = 0.066; F = 1.588); EC (p = 0.088; F = 1.577)) were effective on species. Although a small group (asexual species without swimming setae in circle) showed tendency to habitat type and electrical conductivity, such variables are believed to play secondary role on species distribution. Highest species diversity (13 species) was observed at the range of 1200 and 1400 m (a.s.l.) despite the fact that numbers of station sampled was not the highest (22). Also, results yield that reproductive modes of species (sexual and asexual) were not directly correlated with altitude or the environmental variables measured during this study. However, it is believed that these factors play secondary role on structuring the habitats that suitability of habitats appears to be better explanatory factor on ostracod diversity.Öğe Distribution of Sexual and Asexual Ostracoda (Crustacea) from Different Altitudinal Ranges in the Ordu Region of Turkey: Testing the Rapoport Rule(Mary Ann Liebert, Inc, 2012) Kulkoyluoglu, Okan; Sari, Necmettin; Akdemir, Derya; Yavuzatmaca, Mehmet; Altinbag, CerenKulkoyluoglu, Okan, Necmettin Sari, Derya Akdemir, Mehmet Yavuzatmaca, Ceren Altinbag.. Distribution of sexual and asexual ostracoda (crustacean) from different altitudinal ranges in the Ordu region of Turkey: Testing the Rapoport Rule. High Alt. Med. Biol. 13: 126-137.-We evaluated Rapoport's rule which states a negative correlation between species richness and altitude. To understand the relationship between altitude and reproductive modes (a/sexual) of non-marine ostracods, 166 aquatic bodies in Ordu region, Turkey were randomly sampled from July 11 to July 16, 2010. Atotal of 26 species of ostracods were found from 133 out of 166 sites. Except for one species (Heterocypris incongruens), the other 25 species were new reports for the region. Candona improvisa was also a new report for Turkish ostracod fauna. Three species (Psychrodromus olivaceus, H. incongruens, and C. neglecta) occurred most frequently as 43, 46, and 76 times, respectively. Canonical correspondence analyses exhibited two variables [Habitat type (p = 0.014; F = 2.171) and water temperature (p = 0.018; F = 2.248)] as having the most effect on species. Correlation of species' reproductive modes to those of environmental variables measured was not significant. UPGMA dendrogram displayed 15 most frequently occurring species into four clusters where most species (11) were asexual. Although a small group (asexual species without swimming setae) showed a tendency to habitat type and electrical conductivity, such variables are believed to play secondary role on species distribution. Highest species diversity (13 species) was observed at the range of 1200 and 1400m (a.s.l.), where numbers of stations sampled was not the highest (22). Numbers of asexual species (19) were higher than the sexual (11) but there were no significant differences (p > 0.05) between the frequencies of their occurrences at different altitudinal ranges. Accordingly, our findings do not support the Rapoport Rule. Results yield that reproductive modes of species (sexual and asexual) was not directly correlated to altitude or any environmental variables measured during this study. A better explanation of ostracod diversity appears to be suitability of habitats.Öğe Ostracods from artificially natural habitats: Troughs(2011) Külköylüoglu, Okan; Akdemir, Derya; Sari, Necmettin; Yavuzatmaca, Mehmet; Altinbag, Ceren; Basak, Elif[No abstract available]
