Microplastic Distribution and Composition in Various Ecosystems of the Marmara Region: Current Gaps and Research Needs

Year 2025, Volume: 14 Issue: 1, 56 - 69, 31.03.2025

Ceyhun Akarsu , Vildan Zülal Sönmez , Aminat İsrapilova , Nüket Sivri

https://doi.org/10.33714/masteb.1638467

Abstract

Microplastics are ubiquitous worldwide and are increasingly recognized as a significant environmental problem. In Türkiye, research on microplastics has expanded over the years, providing valuable insights into the issue. However, studies focusing on different ecosystems are still limited and critical knowledge gaps have not been filled. The aim of this study, therefore, is to compare the composition of microplastics in five different ecosystems—marine water, freshwater, marine sediment, freshwater sediment and soil—across Istanbul and the Marmara region, while also identifying similarities and potential sources of pollution. Furthermore, the study emphasizes the need for more comprehensive research on microplastic pollution and its prevention within the different ecosystems of the region. For this purpose, a total of 26 studies were reviewed, in which 312 samples were collected from 304 stations, 222 of which were located in Istanbul. These stations were categorized by ecosystem type and the predominant composition of microplastics. Results revealed that there is a lack of studies on microplastics in surface waters and soil samples at various locations in Istanbul. While studies in the Marmara region have primarily focused on surface water samples from different locations in the Sea of Marmara, research on lentic and lotic systems, sediments and soils is still insufficient. The results also show that various environmental and anthropogenic factors, including water currents and direction, meteorological conditions, maritime traffic, human and industrial activities, proximity to residential areas and wastewater treatment plants, and atmospheric transport influence the concentration and composition of microplastics. In addition, seasonal and annual variations and the effect of station depth on the accumulation of microplastics were observed. Given that, the analyzed stations represent only a small fraction of the region’s ecosystems, this study underlines the urgent need for further research to address existing knowledge gaps. The lack of comprehensive studies hinders the effective management of plastic and microplastic litter in the Marmara region. To enable meaningful comparisons at both local and international scales, adapting standardized methodologies in microplastic research is essential.

Keywords

Ecosystem variability, Hotspot stations, Istanbul, Pollution sources, Surface water

Ethical Statement

The authors declare that there is no conflict of interest. For this type of study, formal consent is not required. All data generated or analyzed during this study are included in this published article (and its supplementary information files).

References

• Akca, M. O., Gündoğdu, S., Akca, H., Delialioğlu, R. A., Aksit, C., Turgay, O. C., & Harada, N. (2024). An evaluation on microplastic accumulations in Turkish soils under different land uses. Science of The Total Environment, 911, 168609. https://doi.org/10.1016/j.scitotenv.2023.168609
• Akdogan, Z., Guven. B., & Kideys, A. E. (2023). Microplastic distribution in the surface water and sediment of the Ergene River. Environmental Research, 234, 116500. https://doi.org/10.1016/j.envres.2023.116500
• Almas, F. F., Bezirci, G., Çağan, A. S., Gökdağ, K., Çırak, T., Kankılıç, G. B., Paçal, E., & Tavşanoğlu, Ü. N. (2022). Tracking the microplastic accumulation from past to present in the freshwater ecosystems: A case study in Susurluk Basin, Turkey. Chemosphere, 303(Part 2), 135007. https://doi.org/10.1016/j.chemosphere.2022.135007
• Aydın, İ., Terzi, Y., Gündoğdu, S., Aytan, Ü., Öztürk, R. Ç., Atamanalp, M., & Alak, G. (2023). Microplastic pollution in Turkish aquatic ecosystems: Sources, characteristics, implications, and mitigation strategies. Turkish Journal of Fisheries and Aquatic Sciences, 23(12), TRJFAS24773. https://doi.org/10.4194/TRJFAS24773
• Baysal, A., Saygin, H., & Ustabasi, G. S. (2020). Microplastic occurrences in sediments collected from Marmara Sea-Istanbul, Turkey. Bulletin of Environmental Contamination and Toxicology, 105, 522-529. https://doi.org/10.1007/s00128-020-02993-9
• Belivermiş, M., Kılıç, Ö., Sezer, N., Sıkdokur, E., Doğruöz Güngör, N., & Altuğ, G. (2021). Microplastic inventory in sediment profile: A case study of Golden Horn Estuary, Sea of Marmara. Marine Pollution Bulletin, 173(Part B), 113117. https://doi.org/10.1016/j.marpolbul.2021.113117
• Bhatt, V., & Chauhan, J. S. (2023). Microplastic in freshwater ecosystem: Bioaccumulation, trophic transfer, and biomagnification. Environmental Science and Pollution Research, 30(4), 9389–9400. https://doi.org/10.1007/s11356-022-24529-w
• Çullu, A. F., Sönmez, V. Z., & Sivri, N. (2021). Microplastic contamination in surface waters of the Küçükçekmece Lagoon, Marmara Sea (Turkey): Sources and areal distribution. Environmental Pollution, 268, 115801. https://doi.org/10.1016/j.envpol.2020.115801
• Devereux, R., Ayati, B., Westhead, E. K., Jayaratne, R., & Newport, D. (2023). “The great source” microplastic abundance and characteristics along the river Thames. Marine Pollution Bulletin, 191, 114965. https://doi.org/10.1016/j.marpolbul.2023.114965
• Dinç, H., & Bölen, F. (2014). İstanbul derelerinin fiziki yapısı [The physical structure of streams in Istanbul]. Planlama Dergisi, 24(2), 107-120. https://doi.org/10.5505/planlama.2014.97269
• Engler, R. E. (2012). The complex interaction between marine debris and toxic chemicals in the ocean. Environmental Science and Technology, 46(22), 12302−12315. https://doi.org/10.1021/es3027105
• Ersoy, Ö., & Özbay, M. (2023). Marmara Bölgesinde bulunan organize sanayi bölgelerinin atık su arıtma tesislerinde oluşan arıtma çamurlarının enerji kaynağı olarak kullanımının değerlendirilmesi [Evaluation of the use of treatment sludge generated in waste water treatment facilities of organized industrial zones in Marmara Region as energy source]. Bilim Armonisi, 6(1), 64-81. https://doi.org/10.37215/bilar.1246638
• Gürkan, Y., & Yüksek, A. (2022). Microplastics in Turkish Straits System: A case study of the bays and straits. Turkish Journal of Fisheries and Aquatic Sciences, 22, TRJFAS20603. https://doi.org/10.4194/TRJFAS20603
• Horton, A. A., Walton, A., Spurgeon, D. J., Lahive, E., & Svendsen, C. (2017). Microplastics in freshwater and terrestrial environments: Evaluating the current understanding to identify the knowledge gaps and future research priorities. Science of The Total Environment, 586, 127-141. https://doi.org/10.1016/j.scitotenv.2017.01.190
• İşlek, Ş., Bostan, Z., Güney, E. & Sönmez, V. Z. (2023). Occurrence and spatial distribution of microplastics in coastal lagoon sediments: The case from Küçükçekmece Lagoon. Commagene Journal of Biology, 7(1), 1-11. https://doi.org/10.31594/commagene.1223041
• Ivar do Sul, J. A., & Costa, M. F. (2014). The present and future of microplastic pollution in the marine environment. Environmental Pollution, 185, 352-364. https://doi.org/10.1016/j.envpol.2013.10.036
• Kroon, F. J., Motti, C. E., Jensen, L. H., & Berry, K. L. E. (2018). Classification of marine microdebris: A review and case study on fish from the Great Barrier Reef, Australia. Scientific Reports, 8, 16422. https://doi.org/10.1038/s41598-018-34590-6
• Marmara Municipalities Union (2021). Wastewater Infrastructure Status and Marine Discharges Related to the Sea of Marmara. Retrieved on https://www.marmara.gov.tr/uploads/mbb-marmara-denizi-atksu-altyap-durumu-ve-deniz-desgarjlar-raporu.pdf
• Mortula, M. M., Atabay, S., Fattah, K. P., & Madbuly, A. (2021). Leachability of microplastic from different plastic materials. Journal of environmental management, 294, 112995. https://doi.org/10.1016/j.jenvman.2021.112995
• Mülayim, A., Bat, L., Öztekin, A., Kecel Gündüz, S., Yücedağ, E. & Bıçak, B. (2022). Microplastic Accumulation in crayfish Astacus leptodactylus (Eschscholtz 1823) and Sediments of Durusu (Terkos) Lake (Turkey). Water, Air & Soil Pollution, 233, 449. https://doi.org/10.1007/s11270-022-05908-y
• Napper, I. E., & Thompson, R. C. (2016). Release of synthetic microplastic plastic fibres from domestic washing machines: Effects of fabric type and washing conditions. Marine Pollution Bulletin, 112(1-2), 39-45. https://doi.org/10.1016/j.marpolbul.2016.09.025
• Olguner, B., Mülayim, A., & Kecel Gündüz, S. (2023). Microplastic concentration in the sediment of the Istanbul Strait (the Sea of Marmara, Türkiye). Journal of Soils and Sediments, 23, 2892- 2904. https://doi.org/10.1007/s11368-023-03550-7
• Sari Erkan, H., Bakaraki Turan, N., Albay, M., & Onkal Engin, G. (2021a). Microplastic pollution in seabed sediments at different sites on the shores of Istanbul-Turkey: Preliminary results. Journal of Cleaner Production, 328, 129539. https://doi.org/10.1016/j.jclepro.2021.129539
• Sari Erkan, H., Bakaraki Turan, N., Albay, M. & Onkal Engin, G. (2021b). A preliminary study on the distribution and morphology of microplastics in the coastal areas of Istanbul, the metropolitan city of Turkey: The effect of location differences. Journal of Cleaner Production, 307, 127320. https://doi.org/10.1016/j.jclepro.2021.127320
• Sari Erkan, H., Takatas, B., Ozturk, A., Gündoğdu, S., Aydın, F., Koker, L., Ozdemir, O. K., Albay, M., & Onkal Engin, G. (2023). Spatio-temporal distribution of microplastic pollution in surface sediments along the coastal areas of Istanbul, Turkey. Marine Pollution Bulletin, 195, 115461. https://doi.org/10.1016/j.marpolbul.2023.115461
• Schwarz, A. E., Ligthart, T. N., Boukris, E., & Van Harmelen, T. (2019). Sources, transport, and accumulation of different types of plastic litter in aquatic environments: A review study. Marine Pollution Bulletin, 143, 92-100. https://doi.org/10.1016/j.marpolbul.2019.04.029
• Sönmez, V. Z., Akarsu, C., & Sivri, N. (2023). Impact of coastal wastewater treatment plants on microplastic pollution in surface seawater and ecological risk assessment. Environmental Pollution, 318, 120922. https://doi.org/10.1016/j.envpol.2022.120922
• Surendran, U., Jayakumar, M., Raja, P., Gopinath, G., & Chellam, P. V. (2023). Microplastics in terrestrial ecosystem: Sources and migration in soil environment. Chemosphere, 318, 137946. https://doi.org/10.1016/j.chemosphere.2023.137946
• Terzi, Y., Gedik, K., Eryaşar, A. R., Öztürk, R. Ç., Şahin, A., & Yılmaz, F. (2022). Microplastic contamination and characteristics spatially vary in the southern Black Sea beach sediment and sea surface water. Marine Pollution Bulletin, 174, 113228. https://doi.org/10.1016/j.marpolbul.2021.113228
• TÜİK. (2022). Adrese dayalı nüfus kayıt sistemi sonuçları. Türkiye İstatistik Kurumu. Retrieved on February 10, 2025, from https://www.tuik.gov.tr/
• Tunali, M. M., Myronyuk, O., Tunali., M., & Yenigün, O. (2022). Microplastic abundance in human influenced soils in recreational, residential, and industrial areas. Water, Air & Soil Pollution, 233, 433. https://doi.org/10.1007/s11270-022-05901-5
• Tunçer, S., Artüz, O. B., Demirkol, M., & Artüz, M. L. (2018). First report of occurrence, distribution, and composition of microplastics in surface waters of the Sea of Marmara, Turkey. Marine Pollution Bulletin, 135, 283-289. https://doi.org/10.1016/j.marpolbul.2018.06.054
• Uddin, S., Fowler, S. W., & Saeed, T. (2020). Microplastic particles in the Persian/Arabian Gulf – A review on sampling and identification. Marine Pollution Bulletin, 154, 111100. https://doi.org/10.1016/j.marpolbul.2020.111100
• Wentworth, J., & Stafford, C. (2016). Marine microplastic pollution. POSTnote, 528, 1-5.
• Woodall, L. C., Sanchez-Vidal, A., Canals, M., Paterson, G. L., Coppock, R., Sleight, V., Calafat, A., Rogers, A. D., Narayanaswamy, B. E., & Thompson, R. C. (2014). The deep sea is a major sink for microplastic debris. Royal Society Open Science, 1(4), 140317. https://doi.org/10.1098/rsos.140317
• Zhang, S., Wang, W., Yan, P., Wang, J., Yan, S., Liu, X., & Aurangzeib, M. (2023). Microplastic migration and distribution in the terrestrial and aquatic environments: A threat to biotic safety. Journal of Environmental Management, 333, 117412. https://doi.org/10.1016/j.jenvman.2023.117412
• Zhang, Y., Kang, S., Allen, S., Allen, D., Gao, T., & Sillanpää, M. (2020). Atmospheric microplastics: A review on current status and perspectives. Earth-Science Reviews, 203, 103118. https://doi.org/10.1016/j.earscirev.2020.103118
• Zhou, T., Min, R., Yang, S., Zhang, H., Zhang, J., Song, S., & Zhang, G. (2024). Distribution of microplastics in Lanzhou section of the Yellow River: Characteristics, ecological risk assessment, and factors analysis. Marine Pollution Bulletin, 207, 116900. https://doi.org/10.1016/j.marpolbul.2024.116900
• Zhu, X., Munno, K., Grbic, J., Werbowski, L. M., Bikker, J., Ho, A., Guo, E., Sedlak, M., Sutton, R., Box, C., Lin, D., Gilbreath, A., Holleman, R. C., Fortin, M. J., & Rochman, C. (2021). Holistic assessment of microplastics and other anthropogenic microdebris in an urban bay sheds light on their sources and fate. ACS EST Water, 1(6), 1401-1410. https://doi.org/10.1021/acsestwater.0c00292