MONITORING SEASONAL HEAVY METAL CONTAMINATION IN COASTAL BROWN ALGAE (PHAEOPHYTA) OF KASTAMONU, TURKEY

This study investigates the seasonal variation in heavy metal accumulation in marine brown algae (Phaeophyta) along the Kastamonu coasts of Turkey. Algal samples were collected from two distinct sites in December 2016, March 2017, June 2017, and September 2017, corresponding to winter, spring, summer, and autumn seasons respectively. The concentrations of manganese (Mn), cadmium (Cd), zinc (Zn), copper (Cu), iron (Fe), nickel (Ni), and lead (Pb) were analyzed through standard laboratory and statistical methods. The results revealed a notable seasonal trend, with the highest concentrations of heavy metals observed during the autumn season. This increase is likely influenced by the initial rains of the season, which may facilitate the deposition of atmospheric pollutants into the marine environment. Furthermore, Site 1 consistently showed higher levels of heavy metals compared to Site 2. This disparity is attributed to Site 1's proximity to urban areas and a port, suggesting increased anthropogenic influence, including city wastewater and maritime activity. Despite the observed variations, heavy metal concentrations have not yet reached critical or hazardous levels. However, the findings underscore the importance of ongoing environmental monitoring. Routine assessments are recommended to track changes in marine pollution and to inform local environmental management strategies.