Quantitative assessment of gula pigmentation in Chironomus riparius (Diptera: Chironomidae)

Gürçay Kıvanç Akyıldız

doi:10.12714/egejfas.43.1.05

EN TR

Quantitative assessment of gula pigmentation in Chironomus riparius (Diptera: Chironomidae)

Abstract

Chironomids (Diptera: Chironomidae) are among the most abundant and ecologically significant invertebrates in freshwater ecosystems. Within this group, the genus Chironomus poses considerable taxonomic challenges due to its high number of cryptic species, especially at the larval stage. Larval identification traditionally relies on qualitative morphological characters, such as the pigmentation of the gula. However, the subjective nature of these observations limits reproducibility and diagnostic accuracy. This study provides a quantitative assessment of gula pigmentation variation among Chironomus riparius larvae derived from a single egg mass. Image processing techniques were applied to convert color traits into measurable parameters, enabling objective analysis of pigmentation intensity, distribution, and optical properties. Digital quantification revealed significant intraspecific variation in gula pigmentation, even among genetically identical larvae reared under uniform laboratory conditions. These results underscore the potential of digital image analysis to improve the precision, objectivity, and reproducibility of morphological identification in chironomids. This methodological framework contributes to the standardization of qualitative traits for broader use in ecological and systematic research.

Keywords

Chironomus riparius (Diptera: Chironomidae)’ta gula pigmentasyonunun nicel değerlendirilmesi

Öz

Chironomidler (Diptera: Chironomidae), tatlı su ekosistemlerinde en bol bulunan ve ekolojik açıdan en önemli omurgasız gruplarından biridir. Bu grup içerisinde yer alan Chironomus cinsi, özellikle larva evresinde çok sayıda kriptik tür içermesi nedeniyle önemli taksonomik güçlükler barındırmaktadır. Larvaların tanımlanması geleneksel olarak gula pigmentasyonu gibi nitel morfolojik karakterlere dayanmaktadır. Ancak bu tür gözlemlerin öznel yapısı, tekrarlanabilirliği ve tanısal doğruluğu sınırlandırmaktadır. Bu çalışmada, tek bir yumurta paketinden elde edilen Chironomus riparius larvalarında gula pigmentasyonundaki varyasyon nicel olarak değerlendirilmiştir. Renk özelliklerini ölçülebilir parametrelere dönüştürmek amacıyla görüntü işleme teknikleri uygulanmış; böylece pigmentasyon yoğunluğu, dağılımı ve optik özelliklerinin nesnel biçimde analiz edilmesi sağlanmıştır. Sayısal analizler, genetik olarak özdeş ve kontrollü laboratuvar koşullarında yetiştirilen larvalar arasında dahi gula pigmentasyonunda anlamlı tür içi varyasyon bulunduğunu ortaya koymuştur. Elde edilen bulgular, dijital görüntü analizinin chironomidlerde morfolojik tanımlamanın doğruluğunu, nesnelliğini ve tekrarlanabilirliğini artırma potansiyelini vurgulamaktadır. Sunulan bu metodolojik yaklaşım, nitel karakterlerin standartlaştırılmasına katkı sağlayarak ekolojik ve sistematik çalışmalarda daha geniş kullanım olanağı sunmaktadır.

Anahtar Kelimeler

Destekleyen Kurum

Bu araştırma, kamu, ticari veya kar amacı gütmeyen herhangi bir finansman kuruluşundan belirli bir hibe, fon veya başka bir destek almamıştır.

Proje Numarası

No Project Number

Etik Beyan

Bu çalışma için özel bir etik onay alınması gerekli değildir.

Teşekkür

Bu araştırma, kamu, ticari veya kar amacı gütmeyen herhangi bir finansman kuruluşundan belirli bir hibe, fon veya başka bir destek almamıştır.

Kaynakça

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Ayrıntılar

Birincil Dil

İngilizce

Konular

Hidrobiyoloji , Tatlı Su Ekolojisi , Sucul Kültür ve Balıkçılık (Diğer)

Bölüm

Araştırma Makalesi

Yazarlar

Gürçay Kıvanç Akyıldız ^*
0000-0001-9610-8443
Türkiye

Yayımlanma Tarihi

18 Şubat 2026

Gönderilme Tarihi

27 Ekim 2025

Kabul Tarihi

29 Aralık 2025

Yayımlandığı Sayı

Yıl 2026 Cilt: 43 Sayı: 1

DOI

https://doi.org/10.12714/egejfas.43.1.05

IZ

https://izlik.org/JA86RC79UC

Kaynak Göster

RIS / Bibtex

APA

Akyıldız, G. K. (2026). Quantitative assessment of gula pigmentation in Chironomus riparius (Diptera: Chironomidae). Ege Journal of Fisheries and Aquatic Sciences, 43(1), 40-47. https://doi.org/10.12714/egejfas.43.1.05