Investigation of Changes in Salt and Microalgal Population Status in Çevlik (Samandağ, Hatay), Pompei (Mezitli, Mersin) Coastal Region Marine Water Resources

Year 2025, Volume: 8 Issue: 5, 1268 - 1272, 15.09.2025

Melda Meral Öcal , İlkcan Yalçın , Dilek Tekdal

https://doi.org/10.34248/bsengineering.1681666

Abstract

Earthquakes remain among the most devastating natural disasters, and despite technological advancements, accurate prediction regarding their timing, location, and magnitude is still unattainable. Recent research highlights the significance of remote sensing indicators, such as chlorophyll-a (Chl-a) concentrations, sea surface temperature (SST), and salinity, as potential earthquake precursors. This study aimed to investigate variations in these marine parameters in the aftermath of the 2023 Kahramanmaraş earthquake and its aftershocks, particularly focusing on coastal areas in Samandağ (Hatay) and Mezitli (Mersin), Türkiye. Marine water samples were collected from Pompei and Çevlik beaches. Key physicochemical parameters, including pH, temperature, and electrical conductivity(EC), were measured immediately upon collection. Samples were also processed for Chl-a analysis through acetone extraction and spectrophotometric measurements, and a portion was transferred to nutrient media for algal isolation. Microscopic analyses revealed significant differences in algal compositions between the two sites. While samples from Mezitli primarily showed the presence of Cylindrotheca closterium and other pennate diatoms, those from Samandağ exhibited higher species diversity, including Thalassionema, Syracosphaera, Grammatophora, and various flagellates and amoebae. Notably, despite lower pH and EC values in Samandağ, the site showed more diverse algal presence, suggesting a complex response of microalgal communities to post-seismic marine conditions. The findings emphasize the dynamic interplay between environmental parameters and biological diversity in marine ecosystems affected by seismic activity. The measured ecological parameters are vital indicators of ecosystem health and may influence physiological functions such as osmoregulation in marine algae. This study contributes to understanding the relationship between seismic events and coastal marine ecosystems. It underscores the importance of long-term monitoring to track ecosystem changes and the potential use of Chl-a concentration, as well as algal diversity, as early indicators of environmental stress. Such insights are vital for marine conservation strategies in earthquake-prone regions.

Keywords

Chlorophyll-a (Chl-a) , Algal diversity , Environmental stress , Marine water quality , Seismic activity

Ethical Statement

Ethics committee approval was not required for this study because there was no study on animals or humans.

Thanks

The authors thank Prof. Dr. Elif Eker Develi for the microscopic analyses and characterization of the algal species.

References

• AFAD, T.C. İçişleri Bakanlığı Afet ve Acil Durum Yönetimi Başkanlığı, 2023. 06 Şubat 2023 Pazarcık (Kahramanmaraş) Mw 7.7 Elbistan (Kahramanmaraş) Mw 7.6 depremlerine ilişkin ön değerlendirme raporu, ss: 83.
• Alvan HV, Azad FH, Omar HB, 2012. Chlorophyll concentration and surface temperature changes associated with earthquakes. Nat Hazards, 64: 691–706.
• Anonymous 2018. Soli Pompeipolis Antik Kenti. URL: https://www.essizmersin.com/tr/2/antik-kentler-ve-kaleler/soli-pompeipolis-antik-kenti/86 (accessed date: March 5, 2022).
• Görün A, 2006. Ecology and seasonal change of harmful algae Goniodoma (Goniodomataceae) and Ceratium (Ceratiaceae) in Çevlik Region (Hatay), Eastern Mediterranean. MSc thesis, Hatay Mustafa Kemal University, Institute of Science, Hatay, Türkiye, pp: 20-32.
• Green DA, Thompson EI, Willis SP, 2021. Advances in algal isolation techniques and their significance for marine biodiversity studies. J Exp Mar Biol Ecol, 489: 58-66.
• Holm-Hansen O, Riemann B, 1978. Chlorophyll a determination: Improvements in methodology. Oikos, 30: 438-447.
• Isık O, 2002. Phytoplankton distribution, diversity, and nutrients at the north-eastern Mediterranean coast of Türkey (Karataş-Adana). Turk J Bot, 26: 77-86.
• Jones AR, Smith BL, Nguyen CD, 2018. The importance of microalgal diversity in marine ecosystems: Implications for food webs and biogeochemical cycles. J Mar Biol Ecol, 450(2): 123-137.
• Kayıkçı S, 2019. Seleucia Pieria Antik Kenti (Çevlik-Samandağ-Hatay) ve yakın çevresinin florası. MSc thesis, Hatay Mustafa Kemal Üniversitesi, Hatay, Türkiye.
• Kök DS, Kahya Sayar Y, 2022. Savranda Kalesi mimari değerlendirmesi. Online J Art Des, 10(3): 114-134.
• Lahn E, 1949. Türkiye yer depremleri ile tektonik arasındaki münasebetler hakkında. Türk Coğrafya Derg, 11(12): 95-101.
• Lee HO, Anderson TJ, 2019. Osmoregulation in marine algae: Understanding salt stress responses in a changing environment. Aquat Bot, 158: 23-32.
• Lin Y, Deng H, Du K, Li J, Lin H, Chen C, Zhang G, 2017. Soil quality assessment in different climate zones of China’s Wenchuan earthquake-affected region. Soil Tillage Res, 165: 315–324.
• Nadri M, Hanzaei AM, 2020. Anomaly detection in time series of chlorophyll around the time and location of large coastal earthquakes using random forest method. J Geomatics Sci Technol, 10(2): 165-174.
• New OOYY, Su MC, Kyaw KT, 2017. Extraction and determination of chlorophyll content from microalgae. Int J Adv Res Publ, 1(5): 298-301.
• Patel S, Singh AK, 2017. Seismic activities and their impact on marine water quality: A review. Environ Monit Assess, 189(4): 176.
• Polat S, Sarihan E, Koray T, 2000. Seasonal changes in the phytoplankton of the northeastern Mediterranean (Bay of Iskenderun). Turk J Bot, 24(1): 1-12.
• Singh RP, Dey S, Bhoi S, Sun D, Cervone G, Kafatos M, 2006. Anomalous increase of chlorophyll concentrations associated with earthquakes. Adv Space Res, 37: 671–680.
• Smith JK, Zhang L, Patel RM, 2020. Impact of salinity and pH on marine microalgae growth rates and community composition. Mar Environ Res, 145: 103-114.
• Sür Ö, 1993. Türkiye’nin deprem bölgeleri. Türkiye Coğrafyası Derg, 2: 53–68.
• Tang D, Zhao H, Satyanarayana B, Zheng G, Singh RP, Lv J, Yan Z, 2009. Variations of chlorophyll-a in the northeastern Indian Ocean after the 2004 South Asian tsunami. International journal of remote sensing, 30(17): 4553-4565.