Trends in population index reported by USGS for southern sea otters
Detailed Description
Trends in population index reported by USGS for southern sea otters in California. Data are shown for independent otters (non‐pups) and all otters for mainland California (blue; left axis), San Nicolas Island (red; right axis), and range-wide (squares; left axis) from 2012 onward, when both indices were combined to calculate the population index.