Stable isotope assessment of temporal and geographic differences in feeding ecology of northern fur seals (Callorhinus ursinus) and their prey

Oecologia ◽  
2001 ◽  
Vol 126 (2) ◽  
pp. 254-265 ◽  
Author(s):  
Carolyn M. Kurle ◽  
Graham A.J. Worthy
Keyword(s):  
Stable Isotope ◽  
Feeding Ecology ◽  
Callorhinus Ursinus ◽  
Fur Seals ◽  
Northern Fur Seals ◽  
Geographic Differences

scholarly journals Stable Isotope Models Predict Foraging Habitat of Northern Fur Seals (Callorhinus ursinus) in Alaska

PLoS ONE ◽  
2015 ◽  
Vol 10 (6) ◽  
pp. e0127615 ◽  
Author(s):  
T. K. Zeppelin ◽  
D. S. Johnson ◽  
C. E. Kuhn ◽  
S. J. Iverson ◽  
R. R. Ream
Keyword(s):  
Stable Isotope ◽  
Callorhinus Ursinus ◽  
Foraging Habitat ◽  
Fur Seals ◽  
Northern Fur Seals

Estimation of Sexual Maturity Based on Morphometrics of Genital Organs in Male Northern Fur Seals, Callorhinus ursinus

Mammal Study ◽  
2020 ◽  
Vol 46 (1) ◽  
Author(s):  
Yukino Hirakawa ◽  
Takanori Horimoto ◽  
Ippei Suzuki ◽  
Yoko Mitani
Keyword(s):  
Sexual Maturity ◽  
Callorhinus Ursinus ◽  
Fur Seals ◽  
Northern Fur Seals

NATURALLY-OCCURRING LEPTOSPIROSIS IN NORTHERN FUR SEALS (Callorhinus ursinus)

1977 ◽  
Vol 13 (2) ◽  
pp. 144-148 ◽  
Author(s):  
ALVIN W. SMITH ◽  
RICHARD J. BROWN ◽  
DOUGLAS E. SKILLING ◽  
H. L. BRAY ◽  
MARK C. KEYES
Keyword(s):  
Callorhinus Ursinus ◽  
Naturally Occurring ◽  
Fur Seals ◽  
Northern Fur Seals

Estimating the Juvenile Survival Rate of Male Northern Fur Seals (Callorhinus ursinus)

1989 ◽  
Vol 46 (8) ◽  
pp. 1428-1436 ◽  
Author(s):  
Andrew W. Trites
Keyword(s):  
Survival Rate ◽  
Juvenile Survival ◽  
Callorhinus Ursinus ◽  
Strongly Correlated ◽  
Fur Seals ◽  
Commercial Harvest ◽  
Northern Fur Seals ◽  
Back Calculation ◽  
Number Of Males ◽  
Insight Into

Three methods for estimating the survival rate of juvenile northern fur seals (Callorhinus ursinus) are developed from the earlier works of Chapman, Smith and Polacheck and Lander. Each of the methods I propose divides the estimated number of males alive at 2 yr of age by the estimated number of pups born in their year class. The number of surviving juveniles are reconstructed by back calculation using the number of males killed during the commercial harvest and the subsequent counts of bulls. The three methods differ in their assumptions concerning subadult survival and escapement from the harvest, although all produce similar estimates when applied to the St. Paul Island fur seals. These new estimates of juvenile survival (1950–80) are strongly correlated with the ratio of cohort kill to pup production and with estimates from the currently-used Lander procedure. This is because the harvest morality of males is large compared with natural morality. The new methods perform acceptably over a wider class of data than Lander's. Their greatest advantage over current procedures is that they provide a better insight into the reliability of the survival estimates they produce.

Digeneans of northern fur seals Callorhinus ursinus (Pinnipedia: Otariidae) from five subpopulations on St. Paul Island, Alaska

2018 ◽  
Vol 117 (4) ◽  
pp. 1079-1086 ◽  
Author(s):  
T. A. Kuzmina ◽  
V. V. Tkach ◽  
T. R. Spraker ◽  
E. T. Lyons ◽  
O. Kudlai
Keyword(s):  
Callorhinus Ursinus ◽  
Fur Seals ◽  
Northern Fur Seals
Sign in / Sign up

Export Citation Format

Share Document