Fig 1.
Location of Steller sea lion research sites on Marmot Island (Alaska, USA).
Marmot Island (circle) is located 45 km northeast of Kodiak Island in the Gulf of Alaska. Inset: Visual observations of permanently marked Steller sea lions were recorded from cliff top overlooks at two rookeries, beach 4 and beach 7 (denoted by black stars), between 2000 and 2013.
Fig 2.
A group of Steller sea lion mothers and pups viewed from a resight location on Marmot Island.
Two permanently marked adult females (T220 and T325) are visible with pups laying at their side.
Table 1.
Summary of brand resight effort and results from Marmot Island, AK, between 2000 and 2013.
Start date is the first day of observations in each year and end date is the last. Field season is the number of days between the start and end date. Resight days are the number of days in each year that observers were at the rookery. Only permanently marked pups observed associated with a female (Pups, see methods) and permanently marked adult females (Adult females) observed with pups were included in the analysis.
Fig 3.
Estimated daily (top) and cumulative (bottom) dispersal for marked Steller sea lions on Marmot Island, AK, between 2000 and 2013 (Table 1).
Black lines denote mean dispersal for all study years and shaded areas encompass the 95% confidence intervals. The planned start of the annual aerial survey to measure pup production is 23 June and the end is 10 July, denoted by black arrows.