Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water

Tuna Karaytuğ; Ferah Sayım

doi:10.12714/egejfas.42.4.08

TR EN

Gediz Nehri yüzey suyunun fizikokimyasal parametreleri ile Daphnia magna toksisite testlerinin birlikte değerlendirilmesi

Öz

Bu çalışmada, Gediz Nehri'ndeki kirlilik, Daphnia magna toksisite testleri kullanılarak değerlendirilmiştir. Su örnekleri, ilkbahar ve yaz mevsimlerinde beş farklı istasyondan toplandı. Fe, Mn, Cl⁻, NH₃-N, S²⁻, K, NO₃⁻-N ve PO₄³⁻ gibi temel kimyasal bileşenlerin konsantrasyonları spektrofotometrik yöntemlerle belirlendi. Akut ve kronik toksisite testleri OECD yönergelerine uygun olarak gerçekleştirildi. Akut toksisite, ilkbaharda birden fazla istasyonda ve yazın bir istasyonda gözlendi. Buna karşılık, kronik maruziyet sonuçları, Gediz Nehri’nde bilinen organik ve inorganik kirliliğe rağmen D. magna üzerinde anlamlı olumsuz etkiler göstermedi. İlginç bir şekilde, bazı örnekler test organizmalarında büyüme, gelişim ve üremenin uyarıldığını ortaya koydu; bu durum, suda düşük konsantrasyonlarda bulunan ve sedimentlerde daha fazla yoğunlaşan kirleticilerden kaynaklanan hormetik etkileri işaret etmektedir. Bu bulgular, yalnızca su kolonuna dayalı Daphnia toksisite testlerinin, Gediz Nehri'nde bulunan organik ve inorganik kirleticilerin birleşik etkilerini tam olarak yansıtamayabileceğini ortaya koymaktadır.

Anahtar Kelimeler

Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water

Öz

In this study, pollution in the Gediz River was assessed using Daphnia magna toxicity tests. Water samples were collected from five distinct stations during spring and summer. Concentrations of key chemical constituents, including Fe, Mn, Cl⁻, NH₃-N, S²⁻, K, NO₃⁻-N, and PO₄³⁻, were determined spectrophotometrically. Acute and chronic toxicity tests were conducted according to OECD guidelines. Acute toxicity was observed at multiple stations in spring and at one station in summer. Conversely, chronic exposure results revealed no significant adverse effects on D. magna, despite the known organic and inorganic pollution in the Gediz River. Interestingly, some samples demonstrated stimulation of growth, development, and reproduction in the test organisms, indicating hormetic effects caused by low pollutant concentrations in the water, which are more concentrated in sediments. These findings underscore that Daphnia-based water-column toxicity tests alone may not fully capture the combined impacts of organic and inorganic contaminants present in the Gediz River.

Anahtar Kelimeler

Destekleyen Kurum

Scientific Research Projects Commission of Ege University (Project No: 2013Fen17) and TÜBİTAK-BİDEB (2210-C Domestic Master's Scholarship Program for Priority Areas)

Proje Numarası

2013fen 17

Etik Beyan

Ethical approval is not required for this study.

Teşekkür

The authors would like to express their gratitude to Prof. Dr. Meltem Conk Dalay and Dr. Zeliha Demirel for providing the initial algal culture. and to Assoc. Prof. Dr. Orkide Minareci for accompanying them during the first fieldwork and sharing her valuable experience.

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Ayrıntılar

Birincil Dil

İngilizce

Konular

Deniz ve Nehir Ağzı Ekolojisi , Hidrobiyoloji, Tatlı Su Ekolojisi, Ekoloji (Diğer), Sucul Kültür ve Balıkçılık (Diğer)

Bölüm

Araştırma Makalesi

Yazarlar

Tuna Karaytuğ ^*
0000-0002-1723-209X
Türkiye

Ferah Sayım
0000-0002-1496-8878
Türkiye

Erken Görünüm Tarihi

1 Aralık 2025

Yayımlanma Tarihi

10 Aralık 2025

Gönderilme Tarihi

20 Haziran 2025

Kabul Tarihi

30 Ekim 2025

Yayımlandığı Sayı

Yıl 2025 Cilt: 42 Sayı: 4

DOI

https://doi.org/10.12714/egejfas.42.4.08

IZ

https://izlik.org/JA85RP72LF

Kaynak Göster

RIS / Bibtex

APA

Karaytuğ, T., & Sayım, F. (2025). Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water. Ege Journal of Fisheries and Aquatic Sciences, 42(4), 338-348. https://doi.org/10.12714/egejfas.42.4.08

AMA

1.Karaytuğ T, Sayım F. Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water. EgeJFAS. 2025;42(4):338-348. doi:10.12714/egejfas.42.4.08

Chicago

Karaytuğ, Tuna, ve Ferah Sayım. 2025. “Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water”. Ege Journal of Fisheries and Aquatic Sciences 42 (4): 338-48. https://doi.org/10.12714/egejfas.42.4.08.

EndNote

Karaytuğ T, Sayım F (01 Aralık 2025) Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water. Ege Journal of Fisheries and Aquatic Sciences 42 4 338–348.

IEEE

[1]T. Karaytuğ ve F. Sayım, “Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water”, EgeJFAS, c. 42, sy 4, ss. 338–348, Ara. 2025, doi: 10.12714/egejfas.42.4.08.

ISNAD

Karaytuğ, Tuna - Sayım, Ferah. “Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water”. Ege Journal of Fisheries and Aquatic Sciences 42/4 (01 Aralık 2025): 338-348. https://doi.org/10.12714/egejfas.42.4.08.

JAMA

1.Karaytuğ T, Sayım F. Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water. EgeJFAS. 2025;42:338–348.

MLA

Karaytuğ, Tuna, ve Ferah Sayım. “Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water”. Ege Journal of Fisheries and Aquatic Sciences, c. 42, sy 4, Aralık 2025, ss. 338-4, doi:10.12714/egejfas.42.4.08.

Vancouver

1.Tuna Karaytuğ, Ferah Sayım. Combined evaluation of physicochemical parameters and Daphnia magna toxicity tests of Gediz River surface water. EgeJFAS. 01 Aralık 2025;42(4):338-4. doi:10.12714/egejfas.42.4.08