Prof. Dr. Ahmet Altındağ is a Professor of Hydrobiology at Ankara University, Faculty of Science, Department of Biology. He received his B.Sc. from Hacettepe University and completed both his M.Sc. and Ph.D. in Biology at Ankara University. His research focuses on freshwater ecology, hydrobiology, zooplankton dynamics, and the effects of environmental stressors, particularly heavy metals, on aquatic organisms. His work integrates ecological assessment, ecotoxicology, and biodiversity monitoring in freshwater ecosystems. He has published over 100 scientific articles in international peer-reviewed journals indexed in SCI and Scopus, including Hydrobiologia, Chemosphere, and Journal of Freshwater Ecology. He has supervised numerous MSc and PhD theses on aquatic biodiversity, ecotoxicology, and environmental management, and has led or contributed to several national and international research projects. A significant part of his work focuses on zooplankton communities, particularly their diversity, seasonal dynamics, and responses to environmental stressors such as pollution and climate change in freshwater ecosystems.