Northern fur seal demography studies at San Miguel Island, California conducted from 1975-10-07 to 2014-09-26 (NCEI Accession 0141240)

The National Marine Mammal Laboratories' California Current Ecosystem Program (AFSC/NOAA) initiated a long-term marking program of northern fur seals (Callorhinus ursinus) at San Miguel Island, California in 1975. A sample of up to 300 pups has been tagged in the foreflippers with various types and colors of tags each year between 1975 and the present. Resighting surveys for marked animals are conducted annually at summer breeding sites. Resightings are also obtained from the public when animals are observed on beaches or in fisheries. The data are used in mark-recapture models to estimate the age and sex specific vital parameters of the population and to describe age and sex specific reproductive behavior and seasonal movements of animals throughout their lives.

美国国家海洋哺乳动物实验室（National Marine Mammal Laboratories）下属加利福尼亚洋流生态系统项目（隶属于阿拉斯加渔业科学中心/美国国家海洋和大气管理局（AFSC/NOAA））于1975年在加利福尼亚州圣米格尔岛启动了北海狗（Callorhinus ursinus）的长期标记计划。1975年至今，研究团队每年都会为最多300只幼崽的前鳍佩戴不同类型与颜色的标记物。每年，团队都会在夏季繁殖地开展标记个体的重觅调查；同时，公众在海滩或渔业作业中发现标记个体的上报信息也会被纳入相关数据。该数据集被应用于标记重捕模型，以估算种群按年龄与性别划分的生命参数，并描述个体按年龄和性别区分的繁殖行为及终生的季节性移动规律。