Investigation of Fluctuating Asymmetry in the Four Otolith Characters of Merlangius merlangus Collected from Middle Black Sea

Year 2018, Volume: 4 Issue: 2, 128 - 138, 03.12.2018

Seda KONTAŞ Derya BOSTANCI Serdar YEDİER Gülşah KURUCU Nazmi POLAT

Abstract

Fluctuating asymmetry
was calculated for the otolith width, length, area and perimeter of Merlangius merlangus caught in the
Middle Black Sea. In the present study, M.
merlangus samples were divided nine-total length groups. All total length
groups were examined for asymmetry values in the otolith characters, the
highest asymmetry values were found in the Group III. The lowest asymmetry
values in four otolith characters such as area, length, perimeter, and width
were calculated in the Group I and Group IX. In this study, it was determined
that the otolith asymmetry levels of M.
merlangus in the Middle Black Sea were varied between the four otolith
characters, the otolith area has the highest and the otolith length has the
lowest asymmetric feature. In addition, there was no significant relationship
between the asymmetry values of the four otolith characters and total length.
The asymmetry in these otolith characters may be a result of the stress from
different pollutants in the Black Sea.

Keywords

Sagittal otolith, Merlangius merlangus, Fluctuating asymmetry, Environmental factors, Black Sea

Orta Karadeniz’den Örneklenen Merlangius merlangus‘un Dört Otolit Karakterinin Dalgalı Asimetrisinin İncelenmesi

Abstract

Orta Karadeniz'den yakalanan Merlangius merlangus’un otolit
genişliği, uzunluğu, alanı ve çevresi için dalgalı asimetri değerleri
hesaplanmıştır. Bu çalışmada elde
edilen M. merlangus örnekleri dokuz
total boy grubuna ayrılmıştır. Tüm total boy grupları, otolit karakterlerindeki
asimetri değerleri açısından incelenmiş ve en yüksek asimetri değerleri Grup
III'de bulunmuştur. Alan, uzunluk, çevre ve genişlik gibi dört otolit
karakterindeki en düşük asimetri değerleri Grup I ve Grup IX'de hesaplanmıştır.
Bu çalışmada, Orta Karadeniz'deki M.
merlangus'un otolit asimetri düzeylerinin bu dört otolit karakteri arasında
farklılık gösterdiği, otolit alanının en yüksek ve otolit boyunun ise en düşük
asimetrik özelliğe sahip oluğu belirlenmiştir. Ayrıca bu dört otolit
karakterinin asimetri değerleri ile total boy grupları arasında anlamlı bir
ilişki yoktur. Bu türün otolit karakterlerinde gözlenen asimetri Karadeniz’deki
farklı kirleticilerden kaynaklı stresin bir sonucu olabilir.

Keywords

Sagittal otolit, Merlangius merlangus, Dalgalı asimetri, Çevresel faktörler, Karadeniz

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