Yellow Coastal Water on the Onega Lake

Abstract

The water in the coastal zone of the Lake Onega during spring and early summer is covered with a yellow-white bloom. This situation also happened in June 2020. This is a well-known phenomenon, however it causes confusion every year. A strange film on the water surface is just the result of pine flowering. Pine grows are widespread on the shores of the Lake Onega. Why is there so much pine pollen, and why does it not sink? What will happen to this pollen when it finally sinks to the bottom?