Assessment of Zooplankton Community Structure and Trophic State in Boraboy Lake (Amasya, Türkiye)

Abstract

This study is the first investigation to evaluate the zooplankton community structure of Boraboy Lake, a landslide-dammed freshwater ecosystem located in Amasya Province, Türkiye. Seasonal sampling was conducted in spring, summer, autumn, and winter at four stations. Physicochemical parameters, such as temperature, pH, dissolved oxygen, electrical conductivity (EC), Secchi depth (SD), total phosphorus (TP), total nitrogen (TN), and chlorophyll a (Chl-a), were measured and evaluated using Carlson’s Trophic State Index (TSI), OECD classification, and Turkish Surface Water Quality Regulation. Results showed that Boraboy Lake generally exhibits oligotrophic to mesotrophic characteristics, with an average TSI value of 31.6. A total of 36 zooplankton species were identified: 26 Rotifera, eight Cladocera, and two Copepoda. Dominant taxa included Eudiaptomus gracilis, Keratella cochlearis, and Bosmina longirostris, while Polyarthra vulgaris and Asplanchna priodonta showed seasonal peaks. These findings highlight the ecological significance of Boraboy Lake and underscore the importance of regular monitoring to ensure the long-term sustainability of its biodiversity and ecosystem services.

Keywords

• Turkey
• Lake
• Trophic Status
• Zooplankton
• Community

Boraboy Gölü (Amasya, Türkiye)’nde Zooplankton Topluluk Yapısının ve Trofik Durumunun Değerlendirilmesi

Öz

Bu çalışma Amasya ilinde yer alan heyelan set gölü olan Boraboy Gölü’nün, zooplankton komünite yapısının değerlendirildiği ilk çalışmadır. İlkbahar, yaz, sonbahar ve kış olmak üzere mevsimsel örneklemeler toplamda dört istasyonda gerçekleştirilmiştir. Sıcaklık, pH, çözünmüş oksijen, elektriksel iletkenlik (EC), Secchi diski derinliği (SD), toplam fosfor (TP), toplam azot (TN) ve klorofil-a (Chl-a) gibi fiziko-kimyasal parametreler ölçülmüş; Carlson Trofik Seviye İndeksi (TSI), OECD sınıflandırması ve Türkiye Yüzeysel Su Kalitesi Yönetmeliği çerçevesinde değerlendirilmiştir. Sonuçlar, gölün genel olarak oligotrofik ile mezotrofik özellikler gösterdiğini ve ortalama TSI değerinin 31,6 olduğunu ortaya koymuştur.  Zooplankton topluluk yapısı incelendiğinde toplam 36 tür belirlenmiştir: 26 Rotifera, 8 Cladocera ve 2 Copepoda. Baskın taksonlar arasında Eudiaptomus gracilis, Keratella cochlearis ve Bosmina longirostris yer alırken, Polyarthra vulgaris ve Asplanchna priodonta mevsimsel pikler göstermiştir. Bulgular, Boraboy Gölü’nün ekolojik önemini vurgulamakta ve biyolojik çeşitliliğin sürdürülebilirliği için düzenli izleme gerekliliğini ortaya koymaktadır.

Anahtar Kelimeler

• Türkiye
• Göl
• Trofik Durum
• Zooplankton
• Komünite

Kaynakça

1. Aka M, Pagano M, Saint-Jean L, Arfi R, Bouvy M, Cecchi P, Corbin D, Thomas S. 2000. Zooplankton variability in 49 shallow tropical reservoirs of Ivory Coast (West Africa). Int Rev Hydrobiol. 85(4):491-504. doi:10.1002/1522-2632(200008)85:4<491::AID-IROH491>3.0.CO;2-G
2. Alexander TJ, Vonlanthen P, Seehausen O. 2017. Does eutrophication-driven evolution change aquatic ecosystems? Philos T Roy Soc B. 372(1712):1-10. doi: 10.1098/rstb.2016.0041
3. Altındağ A, Berdi D. 2025. Rising temperatures, changing waters: The influence of abiotic factors on freshwater zooplankton community. Desalin Water Treat. 321:1-12. doi: 10.1016/j.dwt.2025.100991
4. Altındağ A, Yiğit S. 1999. The zooplankton fauna and its seasonal variation in Yedigöller (Bolu). Su Ürünleri Dergisi. 16(3-4):229-243. [in Turkish]
5. Altındağ A. 1999. A taxonomical study on the Rotifera Fauna of Abant Lake (Bolu). Turkish J Zool. 23(3):211-214. Arenas‐Sánchez A, López‐Heras I, Nozal L, Vighi M, Rico A. 2019. Effects of increased temperature, drought, and an insecticide on freshwater zooplankton communities. Environ Toxicol Chem. 38(2):396-411. doi: 10.1002/etc.4304
6. Atıcı T, Obalı O. 2002. Comparison of seasonal variation of phytoplankton and chlorophyll–a values of abant and Yedigöller Lakes. Ege University Journal of Fisheries & Aquatic Sciences. 19(3-4):381-389. [in Turkish]
7. Avşar U, Hubert-Ferrari A, De Batist M, Schmidt S, Fagel N. 2015. Sedimentary records of past earthquakes in Boraboy Lake during the last ca 600 years (North Anatolian Fault, Turkey). Palaeogeogr Palaeocl. 433:1-9. doi: 10.1016/j.palaeo.2015.04.031
8. Benzie JAH. 2005. Cladocerans: The Genus Daphnia (Including Daphniopsis). In: Dumont HJF, editör. Guide to the Identification of the Microinvertebrates of the Continental Waters of the World, Vol. 21. Leiden, The Netherlands: Backhuys Publishers. p. 1-376.

9. Bozkurt A, Sagat Y. 2008. Vertical distribution of Birecik Dam Lake (Turkey) zooplankton. Journal of FisheriesSciences.com. 2(3):332-342. [in Turkish]
10. Brooks JL. 1969. Eutrophication and changes in the composition of the zooplankton. In: National Research Council, editor. Eutrophication: causes, consequences, correctives. Washington, the USA: The National Academies Press. p. 236-255.
11. Carlson RE. 1977. A trophic state index for lakes. Limnol Oceanogr. 22(2):361-369. doi: 10.4319/lo.1977.22.2.0361
12. Caroni R, Piscia R, Manca M. 2025. Indicators of Climate-Driven Change in Long-Term Zooplankton Composition: Insights from Lake Maggiore (Italy). Water. 17(4):1-22. doi: 10.3390/w17040511
13. Chaguaceda F, Lau DCP, Goedkoop W, Fadhlaoui M, Lavoie I, Vrede T. 2024. Zooplankton in northern lakes show taxon‐specific responses in fatty acids across climate-productivity and ecosystem size gradients. Limnol Oceanogr. 69(4):947-960. doi: 10.1002/lno.12539
14. Costa JE, Schuster RL. 1988. The formation and failure of natural dams. Geol Soc Am Bull. 100(7):1054-1068. doi:10.1130/0016-7606(1988)100<1054:TFAFON>2.3.CO;2
15. Çetin T, Coşkun T, Demir N. 2023. Evaluation of Phytoplankton Indices and Trophic Status for Small, Deep and Highland Lakes of Yeşilırmak Basin. Acta Aquat Turc. 19(4):298-311. doi: 10.22392/actaquatr.1240143 [in Turkish]
16. Deveci A, Dügel M, Külköylüoğlu O. 2011. Zooplankton of Lake Sünnet (Bolu, Turkey) and determination of some environmental variables. Rev Hydrobiologia. 4(2):115-130.
17. Dhanasekaran M, Bhavan PS, Manickam N, Kalpana R. 2017. Physico-chemical characteristics and zooplankton diversity in a perennial lake at Dharmapuri (Tamil Nadu, India). J Entomol Zool Stud. 5(1):285-292.
18. Duman TY. 2009. The largest landslide dam in Turkey: Tortum landslide. Eng Geol. 104(1-2):66-79. doi: 10.1016/j.enggeo.2008.08.006
19. Edmonson WT. 1959. Fresh-water biology, 2nd edition. New York: John Wiley & Sons Inc 1248 p.
20. Flößner D. 1972. Krebstiere, Crustacea. Kiemen-und Blattfüßer, Branchiopoda. Fischläuse, Branchiura. Jena, Germany: Verlag von Gustav Fischer 501 p. [in German]
21. García-Chicote J, Armengol X, Rojo C. 2019. Zooplankton species as indicators of Trophic state in reservoirs from Mediterranean river basins. Inland Waters. 9(1):113-123. doi: 10.1080/20442041.2018.1519352
22. Göncüoğlu MC. 2010. Introduction to the Geology of Turkey: Geodynamic evolution of the pre-Alpine and Alpine terranes. Ankara: General Directorate of Mineral Research and Exploration. Report No.: 5.
23. Haktanır K, Arcak S. 1998. Çevre Kirliliği. Ankara: Ankara University Agricultural Faculty Publications 457 p. [in Turkish]
24. Heino J, Alahuhta J, Bini LM, Cai Y, Heiskanen AS, Hellsten S, Kortelainen P, Kotamäki N, Tolonen KT, Vihervaara P, Vilmi A, Angeler DG. 2021. Lakes in the era of global change: moving beyond single-lake thinking in maintaining biodiversity and ecosystem services. Biol Rev. 96(1):89-106. doi: 10.1111/brv.12647
25. Hemraj DA, Hossain MA, Ye Q, Qin JG, Leterme SC. 2017. Plankton bioindicators of environmental conditions in coastal lagoons. Estuar Coast Shelf S. 184:102-114. doi: 10.1016/j.ecss.2016.10.045
26. Hermanns RL, Hewitt K, Strom A, Evans SG, Dunning SA, Scarascia-Mugnozza G. 2011. The Classification of Rockslide Dam. In: Evans SG, Hermanns RL, Strom A, Scarascia-Mugnozza G, editors. Natural and artificial rockslide dams. Berlin, Germany: Springer Science & Business Media. p. 581-593.
27. Herzig A. 1987. The analysis of planktonic rotifer populations: A plea for long-term investigations. Hydrobiologia. 147(1):163-180. doi: 10.1007/BF00025739
28. Jeppesen E, Nõges P, Davidson TA, Haberman J, Nõges T, Blank K, Lauridsen TL, Søndergaard M, Sayer C, Laugaste R, Johansson LS, Bjerring R, Amsinck SL. 2011. Zooplankton as indicators in lakes: a science-based plea for including zooplankton in the ecological quality assessment of lakes according to the European Water Framework Directive (WFD). Hydrobiologia. 676(1):279-297. doi: 10.1007/s10750-011-0831-0
29. Koste W. 1978. Rotatoria - Die Radertiere Mitteleuropas. Berlin-Stuttgart: Gebrüder Borntraeger 673 p. [in German]
30. Li Y, Wang R, Su H, Wang J, Xie P, Chen F. 2022. Eutrophication and predation mediate zooplankton diversity and network structure. Limnol Oceanogr. 67:133-145. doi: 10.1002/lno.11957
31. Maier G. 1990. The effect of temperature on the development, reproduction and longevity of two common cyclopoid copepods – Eucyclops serrulatus and Cyclops strenuus. Hydrobiologia. 203(3):165-175. doi: 10.1007/BF00005685
32. Margaritora FG, Cottarelli V. 1970. Le biocenosi planctoniche estive del lago Abant (Turchia Asiatica, Regione del Mar Nero). Rendic Accad Lomb Sci Lett Cl Sci B. 104:170-190. [in Italian]
33. McCormick SD, Taylor ML, Regish AM. 2020. Cortisol is an osmoregulatory and glucose-regulating hormone in Atlantic sturgeon, a basal ray-finned fish. J Exp Biol. 223(18):1-10. doi: 10.1242/jeb.220251
34. Nogrady T, Pourriot R, Segers H. 1995. Rotifera, Volume 3: Notommatidae and Scaridiidae. The Hague, the Netherlands: SPB Academic Publishing 248 p.
35. Ocakoğlu F, Topçu S, Açıkalın S, Erayık C, Kır O. 2023. Dynamics and a Hydraulic-Soil Mechanical Model for Pockmarks in a Mud-draped Lake: Lake Sünnet (NW Anatolia). Geol Acta. 21:1-11. doi: 10.1344/GeologicaActa2023.21.11
36. OECD 1982. Organisation for Economic Co-operation and Development. Trophic Terminology. Eutrophication of Waters, Monitoring, Assessment and Control. Paris: OECD 154 p.
37. Official Gazette 2004. Su Kirliliği Kontrolü Yönetmeliği; [cited 2025 Sept 12]. Available from https://www.mevzuat.gov.tr/mevzuat?MevzuatNo=7221&MevzuatTur=7&MevzuatTertip=5 [in Turkish]
38. Official Gazette 2016. Yerüstü Su Kalitesi Yönetmeliğinde Değişiklik Yapilmasina Dair Yönetmelik; [cited 2025 Sept 13]. Available from https://www.resmigazete.gov.tr/eskiler/2016/08/20160810-9.htm [in Turkish]
39. Özdemir Mis D, Aygen C, Ustaoğlu MR, Balık S, Sarı HM. 2017. A preliminary study on the zooplankton composition of some lakes in the Western Black Sea Region (Turkey). Ege Journal of Fisheries and Aquatic Science. 34(3):311-320. doi: 10.12714/egejfas.2017.34.3.10 [in Turkish]
40. Pinto I, Nogueira S, Rodrigues S, Formigo N, Antunes SC. 2023. Can Zooplankton Add Value to Monitoring Water Quality? A Case Study of a Meso/Eutrophic Portuguese Reservoir. Water. 15(9):1-16. doi: 10.3390/w15091678
41. Qi J, Wang Y, Yuan J, Liao C, Liu J, Guo C. 2025. Variations of zooplankton community as bioindicators of eutrophication and water quality in shallow Yangtze Lakes. Limnologica. 112:126248. doi: 10.1016/j.limno.2025.126248
42. Rocha GM, Fères JDC, Kandler GM, Cagnin RC, da Silva CA, Rodrigues SK, Lehrback BD, Gramlich KC, Neto RR, Sa F, Fernandes LFL. 2024. Microprotozooplankton as eutrophication bioindicator for tropical coastal lagoons. Mar Freshwater Res. 75(10):MF23122. doi: 10.1071/mf23122
43. Ruttner-Kolisko A. 1974. Planktonic rotifers: Biology and taxonomy, Biological Station. Stuttgart: Lunz of the Austrian Academy of Science 974 p.
44. Sarı HM, Balık S, Ustaoğlu MR, Özdemir Mis D, Özbek M, Aygen C, Taşdemir A, İlhan A, Yıldız S, Topkara ET, Sömek H. 2004. Investigation on Limnology of the Lakes in Western Black Sea Region. İzmir, Türkiye: Ege University. Report No.: 2001/SÜF/010.
45. Shil J, Ghosh AK, Rahaman SMB. 2013. Abundance and diversity of zooplankton in semi-intensive prawn (Macrobrachium rosenbergii) farm. SpringerPlus. 2(1):1-8. doi: 10.1186/2193-1801-2-183
46. Sönmez AY, Hisar O, Karataş M, Arslan G, Aras MS. 2008. Sular Bilgisi. Ankara: Nobel Yayın Dağıtım 199 p. [in Turkish]
47. Špoljar M, Tomljanović T, Lalić I. 2011. Eutrophication impact on zooplankton community: a shallow lake approach. The Holistic Approach to Environment. 1(4):131-142.
48. Şenol E. 2018. Boraboy Lake (Amasya) and Around’s Major Problems Based From Recreational Use. Doğu Coğrafya Dergisi. 23(39):95-112. doi: 10.17295/ataunidcd.412503 [in Turkish]
49. Velioğlu A, Kırkağaç M. 2017. Seasonal Variation of Zooplankton in Lake Mogan. Turkish J Aquat Sci. 32(3):146-153. doi: 10.18864/TJAS201713 [in Turkish]
50. Virro T, Haberman J, Haldna M, Blank K. 2009. Diversity and structure of the winter rotifer assemblage in a shallow eutrophic northern temperate Lake Võrtsjärv. Aquat Ecol. 43(3):755-764. doi: 10.1007/s10452-009-9276-1
51. Yağcı MA 2010. Göllerde Ötrofikasyon, Kontrolü ve Planktonik Gösterge Türler. Aquaculture Studies.10(1):11-14. [in Turkish]
52. Zhao K, Yang J, Lv J, Liu Q, Liu X, Xie S, Feng J. 2022. Structural characteristics of periphytic algal community and its relationship with environmental factors in the Taiyuan Region of the Fenhe River. Water. 14(14):1-15. doi: 10.3390/w14142151