Oikopleura (Vexillaria) dioica Fol, 1872 (Sınıf: Appendicularia)’nın Güneydoğu Karadeniz Ekosisteminde Biyometrik Özellikleri, Zamansal ve Alansal Dağılımı

Araştırma Güneydoğu Karadeniz ekosisteminde 2010-2013 yılları arasında 13 istasyondan aylık ve/veya mevsimsel olarak yapılmıştır. Mesozooplankton örnekleri 200 µm plankton ağı ile donatılmış Hydro-bios Hensen tipi plankton kepçesi ile istasyon derinliğine bağlı olarak düşey yöndeki plankton çekimleri ile toplanmıştır. Bu araştırmada Karadeniz ekosisteminde tek tür (Oikopleura dioica) ile temsil edilen Appendicularia sınıfına ait bulgular sunulmuştur. O. dioica’nın 2008-2013 yılları arasındaki yıllık ortalama bolluk değerleri karşılaştırıldığında, en yüksek bolluğu 2008 yılında 313 birey/m3, en düşük bolluk değeri ise 2013 yılında 38 birey/m3 olarak bulunmuştur. Mart 2012- Şubat 2013 yılları arasında aylık olarak alınan örneklerin bolluk değerlerine göre türün en yüksek bolluk değerleri haziran ayında (230 birey/m3) ve şubat ayında (157 birey/m3) tespit edilmiştir. O. dioica’nın kıyı-açık ve bölgesel bolluk değerleri incelendiğinde kıyı istasyonlarında bolluk değerlerinin daha yüksek olduğu saptanmıştır. Ayrıca biyokütle (µg C/m3) değişimi incelendiğinde, ağustos ayında küçük bireylerin katkısı nedeniyle yüksek bolluk değerine karşılık biyokütledeki düşüş dikkat çekmiştir.

Anahtar Kelimeler:

Appendicularia, Biyokütle, Karadeniz, Oikopleura dioica, Zooplankton

Biometric Characteristics, Temporal and Spatial Distribution of Oikopleura (Vexillaria) dioica Fol, 1872 (Class: Appendicularia) in the Southeastern Black Sea Ecosystem

The study was carried out by examining mesozooplankton samples taken from 13 stations in the Southeast Black Sea ecosystem monthly and/or seasonally between 2008 and 2013. The samples were collected with 200 μm Hydro-bios Hensen-type plankton net with vertically depending on the depth of the station. In this study, only results of class Appendicularia which is represented with one species Oikopleura dioica in the Black Sea ecosystem were presented. When the annual average abundance values of O. dioica between 2008 and 2013 are compared, the highest abundance was found as 313 ind./m3 in 2008 and the lowest abundance as 38 ind./m3 in 2013. According to monthly abundance values in between March 2012- February 2013, the highest abundance values were found in June (230 ind./m3) and February (157 ind./m3). When the coastal-open stations and regional abundance values of O. dioica are examined, abundance values at coastal stations are found to be higher. Furthermore, when the biomass (μgC/m3) change was examined, the decrease in biomass was noted though the high abundance value due to the contribution of small individuals in August.

Keywords:

Appendicularia, Biomass, Black Sea, Oikopleura dioica, Zooplankton.,

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