Changes in the reproductive characteristics of northern fur seal females on Tyuleniy island during active harvesting of males

Analyzing data on the physiological state of the northern fur seal females on Tyuleniy Island, which were captured at sea in the period of 1958-1980, we compare the trends with those observed in the populations of Pribylov Islands. Despite a significant difference in the fur seal harvesting strategies used for the Pribylov and Tyuleniy populations, the analysis revealed similar dynamics in the reproductive characteristics of females from both locations during the period of intensive hunting. There were a higher age of first birth and lower pregnancy rates of young females.