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Correlational analyses of the relationships between altitude and carapace size of Ostracoda (Crustacea)
(Edp Sciences S A, 2020) Dalgakıran, Enes; Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya
The relationship between ostracods body size and altitude was studied from 117 aquatic habitats of Mersin province (Turkey). 72.6% of the relationship between 12 ostracods and five environmental variables was explained. Water temperature and pH were the two most effective variables on the species. The mean length of right and left valves of the species were significantly different (p < 0.01, N=3980) at all altitudinal ranges. A strong tendency of changes in valve height with increasing altitude seems to be more prominent than the changes in length for some species. To explore the relationship between ostracods carapace (body) size and altitude, 117 non-marine aquatic habitats were sampled from Mersin province (Turkey) during 03-09 October 2015. A total of 36 species and 14 sub-fossils were detected from 66 of 117 sites located between -3 m and 1630 m a.s.l. Thirty-four of the species are previously unknown in the province. In addition, four of the taxa were new records for the Turkish Ostracoda fauna. Five species (Ilyocypris bradyi, Heterocypris salina, H. incongruens, Psychrodromus olivaceus, Potamocypris fallax) were the most common among all habitats with relatively wide ecological and altitudinal ranges. Canonical correspondence analyses revealed 72.6% of the relationship between 12 ostracods and five environmental variables. Water temperature and pH were the two most influential variables (p < 0.05) on the species. The mean length of right and left valves of the species were significantly different (p < 0.01, N = 3980) at all altitudinal ranges. A strong tendency of changes in valve height with increasing altitude seems to be more prominent (p < 0.05) than the changes in length for some species. Our results do not support some ecological rules but rather, suggest that a linear relationship between carapace size and altitude may only be applicable for some ostracods.
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 Inc, 2019) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya; Yılmaz, Ozan; Çelen, Ebru; Dere, Şükran; Dalkıran, Nurhayat
A 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.
Cypria lacrima sp nov a new ostracoda (Candonidae, Crustacea) species from Texas, USA
(Biodiversity Research Center, Acad Sinica, 2017) Külköylüoğlu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet; Schwartz, Benjamin F.; Hutchins, Benjamin T.
A new ostracod species, Cypria lacrima sp. nov. (Cyclocypridinae) is proposed from an artesian well in Hays County, Texas, U.S.A. The species differs from its conspecies with the following characteristics: unique shape and pit ornamentation on carapace, absence of "e" and "g" setae on both walking and cleaning legs, long gamma seta on Mandibular palp, asymmetric clasping organs and differences in the shape and size of other cheatotaxial parts. A detailed comparison among the species of the genus is provided along with ecological implications. This report increases the geographic distribution of the genus in the southern USA.
Description of a new tribe Cabralcandonini (Candonidae, Ostracoda) from karst aquifers in Central Texas, USA
(Natl Speleological Soc, 2019) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya; Schwartz, Benjamin F.; Hutchins, Benjamin T.
Cabralcandonini tribe n., with the type genus Cabralcandona gen. n. from an artesian well in the San Marcos, Texas (U.S.A.) and six other genera from karst aquifers in Texas, is proposed as a new tribe of the subfamily Candoninae (Candonidae) (Crustacea, Ostracoda). The new tribe and genus have morphological features that distinguish them from other members of the subfamily. The most diagnostic characteristics of the type genus are (1) two horn-like structures developed on the antero- and postero-dorsal margins of the left valve, (2) numbers of central muscle scars, (3) hexagonal or pentagonal (honeycomb-like) ornamentation on the subrectangular shaped carapace, (4) four segmented second antenna in both sexes, (5) absence of an exopod on A2, (6) shape and size of Y aesthetasc, (7) absence of e, f and g setae on cleaning leg, (8) flagellum (whip-like) uropod morphology, (9) shape of hemipenis, and (10) reduction in number of segments and setae on other limbs. Taxonomic keys for the tribes of the subfamily Candoninae including Cabralcandonini tribe n. are presented.
Determining effective environmental factors and ecology of non-marine Ostracoda (Crustacea) in Giresun, Turkey
(EDP Sciences SA, 2022) Çapraz, Çağatay; Külköylüoğlu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet
To determine influential environmental factors on ostracod species, 105 aquatic sampling sites were sampled from the Giresun province. Sixteen species collected from 69 sites are new records for the study area. Seven of 16 species were found in their expected geographical distribution while two species (Ilyocypris bradyi, Psychrodromus olivaceus) showed different distribution (P < 0.05). Of which, P. olivaceus displayed a limited distribution in the northern region of the study area. Geographical distribution of some species and their co-occurrences varied among habitats. The mean values of three variables (water temperature, electrical conductivity, and elevation) were significantly different in northern region than the values of the sampling sites in the southern region (P < 0.01). Canonical Correspondence Analysis explained 72.5% of the significant relationship (P < 0.05) between species and four most effective environmental variables (water temperature, electrical conductivity, elevation, and magnesium). Heterocypris salina and Potamocypris fallax exhibited maximum and minimum tolerance (and optimum) values for electrical conductivity, respectively. Heavy metal presence on the carapace surfaces was investigated using Energy Dispersive X-ray Analysis (EDX) along with SEM photographing. The observation of metals such as copper, aluminum, silver and even radioactive element such as technetium on the carapace surfaces suggests that the organisms studied actually carry much more information about their aquatic environment than it was thought. Overall, our results support the findings of previous studies that water temperature and electrical conductivity were the two most effective factors on ostracod species and can be responsible for their distribution and occurrences in sampling area. 16 ostracods are new records for Giresun. Distribution and co-occurrences of some species varied among habitats. The means of water temperature, electrical conductivity, and elevation were different in the northern region than the south. CCA explained 72.5% of the relationship between species and four variables. Copper, aluminum, silver and technetium were found on the carapace.
Distribution and ecological requirements of ostracods (Crustacea) at high altitudinal ranges in Northeastern Van (Turkey)
(Edp Sciences S A, 2012) Külköylüoğlu, Okan; Sarı, Necmettin; Akdemir, Derya
To understand ostracod distribution and ecology at high altitudes (1659-2889 m 78 different aquatic sites located in the city of Van were sampled during summer of 2009. A total of 29 ostracod species were recorded in 57 sites. Among the species, Trajancypris Iaevis (G.W. Muller 1900), is a new report for the Turkish ostracod fauna. First axis of Canonical Correspondence Analysis (CCA) explained about 68% of the relationships between the 13 most abundant species and environmental variables. Four variables (redox potential, habitat type, pH and electrical conductivity) had the greatest effect on species composition (P < 0.01). Twenty-six species encountered from 38 stations were restricted between 1659 and 1750 m a.s.l. Above 1750 m a.s.l., the numbers of species were not significantly affected by altitude (P > 0.05). Three species (Heterocypris incongruens (Ramdohr, 1808), Hyocypris bradyi Sars, 1890 and Potamocypris villosa (Jurine, 1820)) occurred extensively from 1650 to 2350 m a.s.l. Spearman rank correlation revealed a negative relationship between Limnocythere inopinata (Baird, 1843) and altitude (r = -0.894, P = 0.05). while two species (I. MOO and Prionocypris zenkeri (Chyzer and Toth, 1858)) had a positive correlation to dissolved oxygen (P = 0.05). There was a significantly negative relationship between Hyocypris inermis Kaufmann, 1900 and electrical conductivity, and H. Mcongruens showed a significant correlation to station type. Five groups of species were determined by UPGMA analysis. Species in each cluster were grouped according to ecological conditions suitable for them. Results revealed that species ecological tolerances and optimum levels can be species-specific but species with cosmopolitan distributions tend to have high tolerance ranges to different variables, including altitudinal changes.
Distribution and ecology of Ostracoda (Crustacea) from troughs in Turkey
(Tubitak Scientific & Technical Research Council Turkey, 2013) Külköylüoğlu, Okan; Akdemir, Derya; Sarı, Necmettin; Yavuzatmaca, Mehmet; Oral, Ceren; Başak, Elif
Troughs 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, Kahramanmara, 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 Shannon Wiener 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.
Distribution and local species diversity of freshwater ostracoda in relation to habitat in the Kahramanmaras province of Turkey
(Wiley, 2012) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya; Sarı, Necmettin
To understand the relationship between local (alpha) diversity of ostracods and their distribution, 95 different locations were randomly sampled from southern Kahramanmaras (Turkey) between 7 June and 31 July, 2010. Total of 46 ostracods were encountered from 68 sites. Four alpha diversity indices (Shannon-Wiener, Menhinick, Brillouin, Margalef) individually quantified higher species diversity and evenness for three types of habitats (limnocrene springs, ponds, stream). Diversity partitioning analyses revealed a significant and substantial beta-diversity among the sites. First axis of CCA exhibited about 71% of the correlations between species and environmental variables. Water temperature, having either a negative or positive correlation with individual species, was the most influential factor affecting diversity. Altitude did not significantly affect the numbers of species identified from the elevation ranges of 400-600 m and 800-1000 m. At least nine cosmopolitan species from 56 sites had an important contribution to local diversity. Hence, suitability of aquatic (ecological) conditions and habitat types provide better explanations for ostracod diversity than do other abiotic factors such as altitude, pH and salinity. The results may support the Habitat Diversity Hypothesis but the study needs to be expanded to different regions and cannot be generalized at the moment. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Distribution of sexual and asexual ostracoda (Crustacea) from different altitudinal ranges in Ordu region, Turkey
(2011) Sarı, Necmettin; Külköylüoğlu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet; Altınbağ, Ceren
In order to understand the relationship between altitude and reproductive modes (a/ sexual)
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) Külköylüoğlu, Okan; Sarı, Necmettin; Akdemir, Derya; Yavuzatmaca, Mehmet; Altınbağ, Ceren
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.
Distribution, diversity and ecological characteristics of freshwater ostracoda (Crustacea) in shallow aquatic bodies of the Ankara Region, Turkey
(Springer, 2014) Uçak, Samet; Külköylüoğlu, Okan; Akdemir, Derya; Başak, Elif
Although Turkey has a variety of wetlands of different types and sizes, many of them are threatened by human activities. To show the biological importance of these habitats, samples were randomly collected from 173 different wetland sites in the Ankara region during the summer of 2011. 31 ostracod taxa belonging to 14 genera were identified, including two species (Eucypris elliptica and Cavernocypris subterranea) that are new reports for the Turkish ostracod fauna and 19 taxa that are new reports for the region. Canonical Correspondence Analyses was able to show 58.9% of the correlation between species and environmental variables. Water temperature, moisture and dissolved oxygen were the most important (P = 0.05) factors influencing species occurrence. Increasing sampling size (number of sites) did not significantly increase the numbers of species collected at sites located at elevations between 442 and 1,520 m.a.s.l. This also implies that altitude may have a secondary role on species diversity. Unweighted Paired Group Mean Analyses illustrated four main clustering groups of ostracods, in which species are clustered according to their ecological preferences. Based on our results, suitability of habitats appears to drive ostracod distribution and diversity in these wetland sites. Results clearly showed that these habitats can harbor diverse ostracod communities that warrant conservation.
Distribution, ecological tolerance and optimum levels of freshwater Ostracoda (Crustacea) from Diyarbakir, Turkey
(Springer Japan Kk, 2012) Külköylüoğlu, Okan; Akdemir, Derya; Yüce, Rikap
A total of 23 ostracod taxa were found in 48 of 90 different water bodies (wetlands, springs, lakes, creeks, etc.) located at moderate to high elevation (530-1,095 m) in DiyarbakA +/- r province. The ecological tolerances and optimum values for environmental variables of 15 species were analyzed. Accordingly, maximum numbers of species were found between 700 and 800 m. Ostracod species and sampling sites along with seven environmental variables were ordinated with canonical correspondence analysis (CCA). The first axis of CCA explained 72% of the relationship between species and environmental variables. Of these, water temperature, redox potential and altitude were the most influential (P < 0.05) factors for species. Based on habitat similarities, an unweighted pair group mean average dendrogram divided species into four clustering groups. Among the species, Potamocypris arcuata, Candona neglecta and Psychrodromus fontinalis had the highest optimum estimates for altitude, whereas P. arcuata, Herpetocypris brevicaudata and P. fontinalis exhibited the highest tolerances to altitude. While most species revealed unique tolerances and optimum values for different ecological variables, species with cosmopolitan characteristics had wider ranges of ecological tolerances and distribution amid the variety of habitats along elevational gradients.
Do reproductive modes and swimming ability influence occurrence of non-marine ostracod (crustacea) species among aquatic habitats?
(Zoological Soc Japan, 2019) Külköylüoğlu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet; Celen, Ebru; Dere, Şükran; Dalkıran, Nurhayat
To 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.
Ecological characteristics and habitat preferences of ostracoda (crustacea) wıth a new bisexual population record (Muğla, Turkey)
(Corvinus Univ Budapest, 2020) Akdemir, Derya; Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Tanyeri, Meriç; Gürer, Murat; Alper, Alp; Dere, Şükran; Çelen, Ebru
In 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.
Ecological classification of the freshwater Ostracoda (Crustacea) based on physicochemical properties of waters and habitat preferences
(Edp Sciences S A, 2018) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya; Çelen, Ebru; Dalkıran, Nurhayat
The 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.
Effective roles of ecological factors on nonmarine Ostracoda (Crustacea) in shallow waters of Malatya (Turkey)
(Wiley, 2020) Batmaz, Filiz; Külköylüoğlu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet
This study is aimed to understand effective roles of ecological factors on nonmarine ostracods in Malatya province where 125 different aquatic bodies were randomly sampled during 3-10 August 2015. Totally, 24 of 25 species identified were new reports for the province while Cypridopsis lusatica was a new record for Turkey. The most common species Ilyocypris bradyi was collected from 12 different habitat types. Fifteen species based on their percent similarities among habitat types were clustered into five groups. The first two axes of Canonical Correspondence Analyses explained 66.1% relationship between species and environmental variables. Salinity, water temperature and chloride were found to be the most effective variables on species occurrence. Except chloride and oxidation-reduction potential, there was no significant difference in the mean numbers of environmental variables among the sampling sites with and without species (p < .05). Five most abundant species portrayed the highest ecological tolerance ranges for water temperature. Heterocypris incongruens revealed the highest optimum and tolerance range for dissolved oxygen while Heterocypris salina showed maximum ranges for salinity. Increasing numbers of sampling sites did not increase the percent species numbers per site. Species distribution varied among the habitats. Accordingly, species with swimming ability tend to inhabit more stagnant water bodies while species without such ability were found in flowing waters. This implies that species with good dispersion modes may avoid negative effects of changes in ecological conditions. Thus, our results reveal that biotic factors can also be effective on species as much as abiotic ones.
Effects of Temperature Changes on the Spatial Distribution and Ecology of Ostracod (Crustacea) Species
(2021) Akdemir, Derya; Külköylüoğlu, Okan
To understand the possible effects of changes in ambient temperature on spatialdistribution and ecology of ostracods, samples were randomly collected from 70aquatic sites with 12 different habitat types from Hatay (Turkey) province duringthe summer season of 2012. 14 of 19 ostracod species were newly reported forthe province. The first two axes of CCA explained 79.7% of the cumulativevariance of the relationship between the 12 most common species and fiveenvironmental variables. Accordingly, water temperature and electricalconductivity were the most effective factors on species occurrences (p<0.05).Estimating ecological optimum and tolerance values of species revealed thatHerpetocypris chevreuxi and Cypridopsis vidua displayed the lowest and highesttolerance values for water temperature, respectively. TWINSPAN resultsillustrated that ostracod species can be used to determine characteristics of habitatconditions. Indeed, the co-occurrence of H. chevreuxi with one or morecosmopolitan species is the indication of an increase in salinity and temperaturevalues. Results suggested that temperature changes can cause critical alteration inshallow water bodies where species with lower ecological tolerances willeventually be negatively affected. Therefore, such species, which may be called“potential candidate species for local extinction” will either be eliminated fromthe habitats in short term or become extinct in long term.
Elevational distribution and species diversity of freshwater Ostracoda (Crustacea) in Çankırı region (Turkey)
(Taylor & Francis Inc, 2016) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Sarı, Necmettin; Akdemir, Derya
We investigated how the richness and ecological characteristics of non-marine ostracod species varied across nine 100-m elevation bands (from 549 to 1457 m) in the Cankiri region. We collected a total of 37 taxa (25 living and 12 sub-recent) from 114 of 130 aquatic sites sampled during September of 2011; 34 of the taxa were new records for the region. Eight widely distributed 'cosmopolitan' species (Candona neglecta, Cypridopsis vidua, Heterocypris incongruens, Ilyocypris bradyi, Limnocythere inopinata, Potamocypris villosa, Prionocypris zenkeri, and Psychrodromus olivaceus) were found more frequently than other species. The first two axes of canonical correspondence analyses (CCA) explained 73.2% of the correlation between 11 species and 5 environmental variables. Of which, electrical conductivity (F = 3.99, p = 0.028) and altitude (F = 2.69, p = 0.004) were the most explanatory (p < 0.05) variables for species. Optimum altitude and water temperature values of the cosmopolitan species were relatively higher than the other species. Significant regression models (p < 0.01, r(2) = 0.81) indicate that the frequency of occurrence was affected by changes in numbers of samplings sites from 549 to 1457 m. When highest numbers of species (15 spp.) were found at the range of 1231 - 1332 m, numbers of asexual species (10 spp.) were twice of the sexual species (5 spp.) with no statistical difference between numbers of swimming (7 spp.) and non-swimming (8 spp.) species. Results were discussed based on the ecological conditions that individual species prefer.
Erratum to: Determining effective environmental factors and ecology of non-marine Ostracoda (Crustacea) in Giresun, Turkey
(EDP Sciences SA, 2022) Çapraz, Çağatay; Külköylüoğlu, Okan; Akdemir, Derya; Yavuzatmaca, Mehmet
Some corrections were missed in the production process of the above article, and the publisher apologizes for the inconvenience this is causing. On page 5, the caption of Table 3 should be: Tolerance (Tol) and optimum (Opt) values for the nine most common species against the variables measured from each sampling site. Abbreviations: Count (numbers of species occurrence), Max (maximum numbers of individuals), N2 (Hill’s coefficient or measure of effective number of occurrences), dissolved oxygen (DO, mg l-1), electrical conductivity (EC, mS cm-1), water temperature (Tw, °C), redox potential (ORP), elevation (Elev), sodium (Na 2+, ppm) in water, magnesium (Mg2+, ppm) in water, calcium (Ca2+, ppm) in water, fluoride (F–, ppm) in water, chloride (Cl–, ppm) in water, total phosphate (T.PO43–, ppm) in sediment.
First evidence of Cardinium (Sphingobacteria) in non-marine ostracods from Turkey
(Oxford Univ Press, 2019) Çelen, Ebru; Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Akdemir, Derya; Yılmaz, Ozan
Endosymbiotic bacteria are extremely common and diverse in arthropods. Cardinium, maternally transmitted intracellular bacteria, can contribute to the fitness of the host and can manipulate its reproduction by feminization, cytoplasmic incompatibility, and thelytokous parthenogenesis. Non-marine ostracods can reproduce asexually as well as sexually. We studied the presence of Cardinium in non-marine ostracods collected from 43 sites in Turkey between 2014 and 2017. The presence of Cardinium in 64 specimens belonging to 24 ostracod species were tested by PCR protocol using 16S rRNA-specific primers. A total of 59 specimens belonging to 22 species showed positive result for the presence of Cardinium, with the sequences of the partial 16S rRNA assigned to the bacteria. Results showed that that majority (92 %) of ostracod species tested were found to be infected by Cardinium. It appears that the bacteria can be seen in both sexes depending on species. We report the first evidence of the presence of Cardinium in non-marine ostracods.

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