Long-term dynamics of the abundance of several intertidal polychaetes in two inlets of Kandalaksha Bay (White Sea)

Based on eigenvector filtering and phase surface methods, the correlation between abundance dynamics and water temperature was studied in seven species of White Sea littoral polychaetes. Cyclic fluctuations in abundance with periods of approximately 5 and 12 years were revealed. Some instances of the 5-year cycles of abundance can be explained by climatic changes in the Arctic.