Eumetopias jubatus

Common Name: 
NORTHERN SEA LION
Taxonomic Key: 
Mammals
Legacy ID: 
2 006
Species Name: 
jubatus
Publication Title: 

Age-specific vibrissae growth rates: A tool for determining the timing of ecologically important events in Steller sea lions

Authors: 
Rea, L.D., A.M. Christ, A.B. Hayden, V.K. Stegall, S.D. Farley, C.A. Stricker, J.E. Mellish, J.M. Maniscalco, J.N. Waite, V.N. Burkanov, and K.W. Pitcher
Publication Date: 
2015
Parent Publication Title: 
Marine Mammal Science
Publication Type: 
Archive number: 
2015/0038 FORT
States: 

Pub Abstract: 

Steller sea lions (SSL; Eumetopias jubatus) grow their vibrissae continually, providing a multiyear record suitable for ecological and physiological studies based on stable isotopes. An accurate age-specific vibrissae growth rate is essential for registering a chronology along the length of the record, and for interpreting the timing of ecologically important events. We utilized four methods to estimate the growth rate of vibrissae in fetal, rookery pup, young-of-the-year (YOY), yearling, subadult, and adult SSL. The majority of vibrissae were collected from SSL live-captured in Alaska and Russia between 2000 and 2013 (n = 1,115), however, vibrissae were also collected from six adult SSL found dead on haul-outs and rookeries during field excursions to increase the sample size of this underrepresented age group. Growth rates of vibrissae were generally slower in adult (0.44 +/- 0.15 cm/mo) and subadult (0.61 +/- 0.10 cm/mo) SSL than in YOY (0.87 +/- 0.28 cm/mo) and fetal (0.73 +/- 0.05 cm/mo) animals, but there was high individual variability in these growth rates within each age group. Some variability in vibrissae growth rates was attributed to the somatic growth rate of YOY sea lions between capture events (P = 0.014, r2 = 0.206, n = 29).

Publication Title: 

Stable carbon and nitrogen isotope trophic enrichment factors for Steller sea lion vibrissae relative to milk and fish/invertebrate diets

Authors: 
Stricker, C.A., A.M. Christ, M.B. Wunder, A.C. Doll, S.D. Farley, L.D. Rea, D.A.S. Rosen, R.D. Scherer, and D.J. Tollit
Publication Date: 
2015
Parent Publication Title: 
Marine Ecology Progress Series
Publication Type: 
Archive number: 
2015/0014 FORT
States: 

Pub Abstract: 
Publication Title: 

Discrimination factors for 13C and 15N profiles of vibrissae from adult Steller sea lion females and their pups in utero and post parturition

Authors: 
Christ, A.M., L.D. Rea, J.N. Waite, C.A. Stricker, M. Wunder, and R. Scherer
Publication Date: 
2012
Updated Date (text): 
2012-09-11
Parent Publication Title: 
The 8th International Conference on Applications of Stable Isotope Techniques to Ecological Studies, Brest, France 20-24th, August 2012
Publication Type: 
Archive number: 
2012/0090 FORT
States: 

Pub Abstract: 
Publication Title: 

Spatial variation in the diets of female Steller sea lions inferred from 13C and 15N values of vibrissae from pups

Authors: 
Scherer, R.D., L.D. Rea, A.M. Christ, M. Wunder, and C.A. Stricker
Publication Date: 
2012
Updated Date (text): 
2012-09-11
Parent Publication Title: 
The 8th International Conference on Applications of Stable Isotope Techniques to Ecological Studies, Brest, France 20-24th, August 2012
Publication Type: 
Archive number: 
2012/0091 FORT
States: 

Pub Abstract: