Investigation of the Seasonal Variation in the Phytoplankton in the Surface Waters of the Gulf of Edremit

Year 2014, Volume: 73 Issue: 2, 31 - 46, 23.03.2016

Ece Ağlaç Neslihan Balkıs

Abstract

The aim of this study was to determine the phytoplankton species existing in the Gulf of Edremit and
some environmental conditions affecting them. Samples were collected in July and October 2003 and
in January and April 2004 from 3 stations through horizontal tows using a plankton net. After the
analysis of plankton samples, 123 species that belong to 5 classes were identified. It was determined
that one species (Phalacroma cuneus Schütt, 1895) was a new record for Turkish waters. The species
composition mostly consisted of dinoflagellates (53.7%) which were followed by diatoms (43.9%).
Most of the species which were identified in this study were similar to those phytoplanktonic algal
species which were reported from the Eastern Mediterranean Sea in previous studies. These are neritic,
oceanic, temperate and subtropical climate species. It was detected that 10 out of 19 potentially harmful
algal species identified in this study were toxic species; however, they did not show an extreme increase.
Dinophyceae had the highest cell number in July (1100 cell/L, St.1) and Bacillariophyceae in April
(2280 cell/L, St.2). The environmental variables of the seawater such as temperature (13.0-26.5 ºC),
salinity (35.9-38.5‰) and dissolved oxygen (4.43-8.46 mg/L) were measured in every sampling
period. Consequently, the phytoplankton species and their abundances in the Gulf of Edremit were
firstly determined with this study, and phytoplankton composition representing oligotrophic sea water
characteristic in the Aegean Sea was obtained.

Keywords

Phytoplankton, coastal waters, Gulf of Edremit

Edremit Körfezi’nin Yüzey Suyu Fitoplanktonundaki Mevsimsel Değişimlerin İncelenmesi

Abstract

Edremit Körfezi’nde var olan fitoplankton türleri ile bunların üzerine etkili olan bazı ortam koşullarının saptanması amacıyla örnekler, 2003 yılının Temmuz ile Ekim aylarında ve 2004 yılının Ocak ile Nisan aylarında, 3 istasyondan plankton kepçesiyle, horizontal çekimler yapılarak elde edilmiştir. Plankton örneklerinin incelenmesi sonucunda, 5 sınıfa ait 123 tür saptanmıştır. Bir türün (Phalacroma cuneus Schütt, 1895) Türkiye denizleri için yeni kayıt olduğu belirlenmiştir. Tür kompozisyonunun büyük çoğunluğunu dinoflagellatlar oluşturmuş (%53,7) ve bunu diyatomlar izlemiştir (%43,9). Belirlenen türlerin büyük çoğunluğu, önceki çalışmalarda Doğu Akdeniz’den rapor edilen fitoplanktonik alg türleriyle benzerlik göstermiştir. Bu türler neritik, oseanik, ılıman ve subtropik iklim türleridir. Çalışmada belirlenen 19 potansiyel zararlı alg türünden 10’unun toksik türler olduğu saptanmıştır; ancak, bu türler aşırı artış göstermemiştir. En yüksek birey sayısına Dinophyceae Temmuz ayında (1100 h/L, ist.1), Bacillariophyceae ise Nisan ayında (2280 h/L, ist.2) ulaşmıştır. Deniz suyunun sıcaklık (13,0-26,5 ºC), tuzluluk (‰35,9-38,5) ve çözünmüş oksijen (4,43-8,46 mg/L) gibi fiziko-kimyasal özellikleri de her örnekleme döneminde ölçülmüştür. Sonuç olarak, Edremit Körfezi’nde yaşayan fitoplankton türleri ve bollukları ilk kez bu çalışmayla belirlenmiş ve Ege Denizinin tipik olarak oligotrofik su karakteristiğini temsil eden bir fitoplankton kompozisyonu elde edilmiştir

Keywords

Fitoplankton, kıyısal sular, Edremit Körfezi

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