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    Öğe
    First Report of the Occurrence of Oithona Davisae Ferrari F.D.&Orsi, 1984 (Copepoda: Oithonidae) in the Southern Black Sea, Turkey
    (2016) Üstün, Funda; Kurt, Tuba Terbiyik
    Mevcut çalışmada, Oithona davisae Ferrari F.D.&Orsi, 1984 türünün Sinop, Türkiye kıyısındaki ilk bulunurluğu kaydedilmiştir. Türün bolluk ve biyokütle verisi ve toplam kopepod içerisindeki ergin birey ve kopepodit evrelerinin oranı incelenmiştir. Zooplankton örnekleri Ocak-Aralık 2009'da vertikal çekim yöntemiyle aylık olarak 112 ?m ağ göz açıklığındaki plankton kepçesi ile toplanmıştır. Bu tür örnekleme periyodu boyunca ilk kez Eylül ayında belirlenmiş ve takip eden diğer aylarda da varlığı tespit edilmiştir. En yüksek bolluk ve biyokütle değeri Kasım 2009'da (1485,35 birey.m-3, 2,9 mg.m-3) kaydedilmiştir. Kasım ayında toplam kopepod bolluğuna katkısı %39,89 ve biyokütleye katkısı ise %14,35 idi. Sonuç olarak, elde edilen veriler yerli olmayan kopepod O. davisae Sinop kıyısının ekolojik koşullarına adapte olduğunu göstermektedir.
  • [ X ]
    Öğe
    First Report of the Occurrence of Oithona Davisae Ferrari FD&Orsi, 1984 (Copepoda: Oithonidae) in the Southern Black Sea, Turkey
    (Central Fisheries Research Inst, 2016) Ustun, Funda; Kurt, Tuba Terbiyik
    We report the first occurrence of Oithona davisae Ferrari F.D.&Orsi, 1984 in the Sinop coast, Turkey. Data on the abundance and biomass of this species, and the proportion of adult and copepodite stages in the total copepods were investigated. The zooplankton samples were collected monthly by vertical hauls with plankton net of 112 mu m mesh size from January to December 2009. However, O. davisae was observed for the first time in September, and continued to be observed for the remainder of the sampling period. The highest abundance and biomass of this species were recorded in November 2009 (1485.35 ind.m(-3) and 2.9 mg.m(-3), respectively), which was 39.89% in the abundance and 14.35% of the biomass of the total copepods in November. In conclusion, the non-indigenous copepod species, O. davisae, has adapted to the ecological conditions of the Sinop coast.
  • [ X ]
    Öğe
    The Establishment of the Non-indigenous Cyclopoid Copepod Oithona davisae in Hamsilos Bay-Sinop, Southern Black Sea, Turkey
    (Istanbul Univ Press, Fac Aquatic Sciences, 2024) Ustun, Funda; Kurt, Tuba Terbiyik; Hasancavusoglu, Zeynep
    Hamsilos Bay, which is located within the first-degree natural protection area, is one of the most important regions on the southern Black Sea coast. Moreover, many fish species utilize this area for breeding and rearing activities. Small copepod Oithona davisae has been encountered in the Black Sea for two decades and spread rapidly the overall Black Sea, and become an important component in the pelagic ecosystem of the Black Sea. In this respect, the present study aims to characterize the distribution and abundance of Oithona davisae in Hamsilos Bay about environmental variables. Zooplankton samples were collected monthly from seven stations from July 2015 to June 2016 by using a plankton net with a mesh size of 112 mu m and a diameter mouth opening of 50 cm. O. davisae was observed during the whole sampling period and was the dominant species from July 2015 to December 2015. The highest mean abundance of this species was recorded in September 2015 (3533.33 ind. m-3). However, the lowest mean abundance was observed between January 2016 (170.68 ind. m-3) and May 2016 (0.24 ind. m-3). Copepodites 5-4 were predominant in the O. davisae population in all months and all stations. Adult copepods and their copepodites 5-4 were more abundant between July 2015 and December 2015, whereas the abundance of copepodites 3-1 was maximum between September 2015 and December 2015. The abundance of O. davisae was highly correlated with chlorophyll-alpha and physiochemical variables (temperature, dissolved oxygen, and salinity). In conclusion, this species, which is known to be distributed only in the autumn conditions in close areas, extended its temporal distribution and prevailed in the copepod communities during warmer periods. This could be attributed to the acclimatization success of this species in Hamsilos Bay ecosystems.