YUMURTALIK KIYISAL SULARINDA (KUZEY DOĞU AKDENİZ) MESOZOOPLANKTON STOKLARININ 2012-2017 YILLARI ARASINDAKİ ZAMANSAL DEĞİŞİMİ

Pelajik ekosistemin temel taşlarından olan zooplanktonun kalitatif ve kantitatif değişimi ekosistemde meydana gelen çevresel değişimlerinde göstergesi olarak bilinmektedir. Bu bağlamda, çalışmada mesozooplanktonun miktarsal durumu ve grup kompozisyonu karakterize edilerek İskenderun Körfezi kıyısal sularındaki mevcut durumun tespit edilmesi amaçlanmıştır. Mesozooplankton örneklemeleri Nisan 2012 ve Aralık 2017 yılları arasında mevsimsel sıklıkta dipten yüzeye vertikal olarak 5 istasyonda gerçekleştirilmiştir. Toplam 32 zooplankton grubu bulunmuş olup, bunlardan 15 tanesi holoplankton grubu, gerisi meroplankton gruplarıdır. Holoplankton olan gruplar genellikle çalışma alanında baskın olmakla birlikte, sadece 2013 ve 2015 yılı yaz mevsimlerinde Echinodermata baskın olarak gözlenmiştir. Çalışma alanında holoplanktonda genellikle Copepoda baskın grup olarak gözlenirken, sıcak periyotlarda Cladocera ve Echinodermata baskındır. 2015 yılı sonbaharında ise Doliolida baskın grup olarak gözlenmiştir. Bolluk ve biyokütle değerleri arasındaki fark istatistiki olarak önemsiz olarak bulunmakla birlikte (p>0,05), mevsimsel değişimler istatistiki açıdan önemli çıkmıştır (sırasıyla, p

TEMPORAL CHANGES OF MESOZOOPLANKTON STANDING STOCKS IN COASTAL WATERS OF YUMURTALIK (NORTHEASTERN MEDİTERRANEAN) IN YEARS 2012-2017

The variation in qualitative and quantitative situation, as well as composition of zooplankton, major keystones in the pelagic ecosystem, are known as be an indicators of changing environmental conditions. In this In the present work, we particularly sought to determine the current situation of the coastal waters in Iskenderun Bay by characterizing the quantitative status and group composition of mesozooplankton. Mesozooplankton samplings was taken vertically at 5 stations from surface to bottom between April 2012 and December 2017 at seasonal scale. A total of 32 zooplankton groups were identified, of which 15 were holoplankton and the rest were meroplankton. Although holoplanktonic groups are generally predominant, only Echinodermata was dominant in summer of 2013 and 2015. In the study area, Copepoda was generally seen as a dominant group in holoplankton, while Cladocera and Echinodermata were dominant in warmer periods. Doliolida was only observed as the dominant group in the only autumn of 2015. Although variations in abundance and biomass among years was statistically insignificant (p>0.05), seasonal changes were statistically significant (p

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