Güneydoğu Karadeniz’de Noctiluca scintillans (Macartney) Kofoid & Swezy Dinamiği ve Mesozooplanktona Katkısı

Year 2018, Volume: 33 Issue: 3, 84 - 89, 28.06.2018

Ülgen Aytan Yasemen Şentürk

Abstract

DOI: 10.26650/ASE201814

Son
yarım yüzyılda Karadeniz’de zooplankton kommunitelerinde önemli değişimler
gözlenmiş, bazı türler hemen hemen kaybolurken, bazı türler artış göstermiştir.
Bu türlerden biri olan heterotrofik dinoflagellat Noctiluca scintillans, dünya
denizlerinde yaygın olarak dağılım göstermektedir. Büyük boyutu (>200 µm) ve
fagotrofik beslenme davranışı nedeniyle mesozooplankton içinde değerlendirilen
Noctiluca scintillans 1970’lerden sonra Karadeniz’de mesozooplanktonun baskın
katılımcılarından biri olmuştur. Bu çalışma ile Mayıs 2015-Nisan 2016 tarihleri
arasında Güneydoğu Karadeniz yüzey sularında Noctiluca scintillans populasyon
yapısı ve mesozooplanktona olan katkısı araştırılmıştır. Yüzey sularında
Noctiluca scintillans hücre bolluk değerleri en 
düşük yaz ayları, en yüksek Şubat-Mayıs periyodu olmak üzere 0-23357
hücre.m-3 arasında değişmiş ve nehir ağzından açığa doğru artış eğilimi
sergilemiştir. Örnekleme süresince Noctiluca scintillans hücre çapı 352-629 µm
ve hacmi 2.28x107-1.3x108 µm3 arasında değişmiştir. Toplam mesozooplankton
bolluğu 10-24020 birey.m-3 arasında değişim göstermiştir. Örnekleme
istasyonları arasında Noctiluca scintillans ve mesozooplankton bolluğu
bakımından istatistiksel olarak önemli farklılık bulunamamıştır (p>0,05).
Noctiluca scintillans toplam mesozooplanktona en düşük katkıyı yaz aylarında
yaparken, Şubat-Mayıs periyodunda toplam mesozoplanktona katkısı nehir ağzında
%79±4, kıyı sularında ise %98±2 olarak belirlenmiştir. Çalışma, bölgede
Noctiluca scintillans’ın zooplanktonun hala önemli bir katılımcısı olduğunu
doğrulamaktadır.

Keywords

Noctiluca scintillans, heterotrofik dinoflagellat, mesozooplankton, Karadeniz

Dynamics of Noctiluca scintillans (Macartney) Kofoid & Swezy and its Contribution to Mesozooplankton in the Southeastern Black Sea

Abstract

DOI: 10.26650/ASE201814

During the last half century, significant
changes have been observed in the zooplankton communities in the Black Sea.
While some species have almost disappeared, someother species have increased in
number. Noctiluca scintillans is a red-tide forming heterotrophic
dinoflagellate, which is widely distributed in the world’s oceans. Due to its
large cell size (>200 μm) and phagotrophic feeding behavior, Noctiluca
scintillans is assessed within mesozooplankton communities. After the 1970s,
Noctiluca scintillans became dominant in the mesozooplankton community in the
Black Sea. Between May 2015 and April 2016, the population characteristics of
Noctiluca scintillans and its contribution to mesozooplankton communities were
investigated in surface waters in the southeastern Black Sea. The abundance of
Noctiluca scintillans in surface waters ranged between 0–23357 cells/m-3 with
the lowest number found in the summer and the highest number found from
February to May. Abundance tended to increase from the river mouth toward open
waters. During the study, the cell diameter and volume of Noctiluca scintillans
varied between 352–629 µm and 2.28 x 107–1.3x108 µm3, respectively. The total
mesozooplankton abundance ranged between 10–24020 individuals/m-3. There are no
statistically significant differences in Noctiluca scintillans and
mesozooplankton abundance between sampling stations (p>0.05). The
contribution of Noctiluca scintillans to the mesozooplankton population was the
lowest during summer, but from February to May, Noctiluca scintillans comprised
79%±4% and 98%±2% of the total mesozooplankton population in the river mouth
and coastal waters, respectively. These results confirm that Noctiluca
scintillans is still an important contributor of the mesozoplankton community
in the southeastern Black Sea.

Keywords

Noctiluca scintillans, heterotrophic dinoflagellate, mesozooplankton, Black Sea

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