SPECIES COMPOSITION OF PHYTOPLANKTON FROM THE AVACHA BAY (SOUTHEAST KAMCHATKA) IN LATE SPRING, SUMMER AND AUTUMN IN 2024

In this paper, we discuss personally collected data on the number of phytoplankton cells from the Avacha Bay estimated at regular intervals from 12.05.2024 to 23.10.2024. Our study showed that the vertical distribution of the same microalgal species in various closely located areas of the Avacha Bay is different. This may be due to their adaptation to specific environmental conditions, such as availability of light requirered for photosynthesis, increased concentration of organic matter or hydrodynamic peculiarities. Inside the Avacha Bay, phytoplankton development occurs more intense than at the exit from the bay or outside it. To reduce the frequency and intensity of plankton blooming in the Avacha Bay, it is necessary to constantly monitor the number and structure of plankton and reduce the anthropogenic load on the bay.