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  • Küçük Resim
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    Alpha and beta species diversity of freshwater Ostracoda (Crustacea) and their seasonal distribution in Seben-Taşliyayla Reservoir (Bolu, Turkey)
    (Central Fisheries Research Inst, 2017) Külköylüoğlu, Okan; Tanyeri, Meriç; Yılmaz, Ozan
    To complete the first long-term study on freshwater ostracods and estimate their alpha and beta species diversity in a newly established Seben-Tasliyayla Reservoir (Bolu, Turkey) along with nine different environmental variables, monthly samples were collected from 15 stations located around the reservoir between August 2013 and September 2014. A total of 19 taxa (10 living and 9 subfossils) was reported for the first time from the reservoir. Cypridopsis vidua was the most frequently occurring species with a wide ecological ranges and seasonal distribution. Numbers of living ostracods (the alpha diversity) were found lower than the average numbers of species per lake in Turkey (13.2 spp./lake). When the alpha diversity of the reservoir (2.079) was in the medium, beta diversity (5.2) was ranged from low to medium. Results exhibited natural aquatic habitats showed relatively higher dissimilarities in species composition than small man-made habitats and the reservoir. A possible implication of finding such low numbers of species in such artificial habitats may depend on the age of the reservoir. Finding most of the cosmopolitan (and cosmoecious) species from the reservoir is the indication of ostracods primary succession. Accordingly, long-term studies are recommended to understand possible changes in species assemblages in future.
  • Küçük Resim
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    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.
  • Küçük Resim Yok
    Öğe
    Ecology and seasonal distribution of ostracoda (crustacea) in seben taşliyayla lakelet (Bolu, Turkey)
    (Bolu Abant İzzet Baysal Üniversitesi, 2016) Tanyeri, Meriç; Külköylüoğlu, Okan
    Denizel olmayan ostracod türlerinin mevsimsel dağılımı ve ekolojilerini anlamak için Seben – Taşlıyayla göletinde (barajında) Ağustos 2013 ve Eylül 2014 tarihleri arasında 15 istasyon aylık olarak ziyaret edilmiştir. Buna göre toplamda sekiz tür (Candona weltneri, Cypridopsis vidua, Herpetocypris chevreuxi, Heterocypris salina, Heterocypris incongruens, Limnocythere inopinata, Potamocypris variegata, Koencypris ornata) rapor edilmiştir. Hemen her istasyonda en sık rastlanan tür olan C. vidua çözünmüş oksijen (DO) (4.53-9.47 mg/L), pH (7.53-9.47), su sıcaklığı (Tw) (6-27.3 °C), toplam çözünmüş katı (TDS) (0.0235-0.1021 mg/L) ve elektriksel iletkenlik (EC) (74.4-127.4 ?S/cm) bakımından geniş aralığa sahip iken H. chevreuxi, L. inopinata, H. salina, P. variegata ve H. incongruens en düşük toplam çözünmüş madde (TDS) değerine sahiptir. Ostracod Saat Modeli (OWM)'ne göre, birçok tür net bir mevsimsel dağılım sergilemektedir; örneğin C. vidua Haziran ayından aralık ayına kadar yaygın iken C. weltneri sadece Mart ayında bulunmuştur. Yedi tür ile tür zenginliği en fazla Sonbahar mevsimindedir. Regresyon modelleri hava ve su sıcaklığı arasındaki kuvvetli (P<0.01) korelasyon'u ortaya koymuştur. Türler arasında, altı "Kosmoşius" tür çevresel değişkenlere yüksek tolerans ve geniş coğrafik aralığa sahiptir. Buna göre kozmopolit olmayan ve kozmopolit olan türler arasındaki oranın ("Sahte Zenginlik oranı" da denir) 0.33 olması, barajın erken süksesyon basamağında olduğunu akla getirmektedir.
  • Küçük Resim
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    Ostracoda (Crustacea) species composition and environmental correlates in different aquatic habitats of the Zonguldak and Bartın regions (Turkey)
    (2017) Külköylüoğlu, Okan; Yavuzatmaca, Mehmet; Tanyeri, Meriç; Yılmaz, Ozan
    In order to compare the ostracod species composition of the Zonguldak and Bartın regions of Turkey, samples were collected from 105 aquatic sites with 7 different habitats during June 2013. Thirteen and 18 species were identified from Bartın and Zonguldak, respectively. While all of the species are new reports for Bartın, 11 species are new for Zonguldak. Twenty-two species were common in both regions, with 40.9% similarities. Species abundance (49.2 individuals/site) was found to be greater in Zonguldak than in Bartın (33 individuals/site), but the number of species per sampling site was higher in Bartın (0.48 spp./site) than in Zonguldak (0.42 spp./site). Increasing the numbers of sampling sites did not increase the numbers of species. Among the habitat types, the numbers of species per site was the lowest in troughs (0.35 spp./site). Canonical correspondence analyses explained 78.3% of the correlation with relatively low variance (9.8%) between the 15 most common species and 4 environmental variables in the regions, where water temperature (F = 3.216; P = 0.002) and electrical conductivity (F = 2.525; P = 0.018) displayed strong correlation with the species. However, water temperature per se did not show a significant effect on the numbers of species (P > 0.05). Cosmopolitan species showed relatively high tolerance and optimum values to different environmental variables.