Foraging a new trail with northern fur seals (Callorhinus ursinus): Lactating seals from islands with contrasting population dynamics have different foraging strategies, and forage at scales previously unrecognized byGPSinterpolated dive data

2015 ◽  
Vol 31 (4) ◽  
pp. 1494-1520 ◽  
Author(s):  
Brian C. Battaile ◽  
Chad A. Nordstrom ◽  
Nikolai Liebsch ◽  
Andrew W. Trites
Keyword(s):  
Population Dynamics ◽  
Foraging Strategies ◽  
Callorhinus Ursinus ◽  
Fur Seals ◽  
Northern Fur Seals

Spatial segregation and the influence of habitat on the foraging behavior of northern fur seals (Callorhinus ursinus)

2014 ◽  
Vol 92 (10) ◽  
pp. 861-873 ◽  
Author(s):  
C.E. Kuhn ◽  
R.R. Ream ◽  
J.T. Sterling ◽  
J.R. Thomason ◽  
R.G. Towell
Keyword(s):  
Conservation Strategy ◽  
Foraging Strategies ◽  
Habitat Segregation ◽  
Callorhinus Ursinus ◽  
Foraging Habitat ◽  
Northern Fur Seal ◽  
Dive Behavior ◽  
Fur Seals ◽  
Fur Seal ◽  
Northern Fur Seals

Central place foraging by colonial breeders can lead to depleted prey resources around breeding areas. Segregation of foraging areas both within and between large colonies may act as a mechanism to reduce competition for prey resulting in increased foraging success. We reassessed horizontal (spatial) foraging habitat segregation for northern fur seals (Callorhinus ursinus (L., 1758)) within and between colonies on the Pribilof Islands, Alaska (St. Paul and St. George islands), after the population declined by approximately 40%. Additionally, we examined vertical habitat segregation, where foraging ranges overlapped, and describe the influence of different foraging habitats on northern fur seal dive behavior. Spatial habitat segregation in northern fur seal foraging areas occurred between islands but was variable within islands, which is similar to the pattern previously described. There was no evidence for vertical habitat segregation when fur seals from different rookeries on St. George Island used the same foraging area. Additionally, fur seals from St. Paul Island rookeries that foraged in similar habitats showed fewer differences in dive behavior, indicating that foraging habitat plays a significant role in shaping dive behavior. The use of multiple foraging strategies within the Pribilof Island fur seal population could indicate that a complex management and conservation strategy may be necessary to stop the continuing decline of this population.

scholarly journals The Sun, Moon, Wind, and Biological Imperative–Shaping Contrasting Wintertime Migration and Foraging Strategies of Adult Male and Female Northern Fur Seals (Callorhinus ursinus)

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e93068 ◽  
Author(s):  
Jeremy T Sterling ◽  
Alan M. Springer ◽  
Sara J. Iverson ◽  
Shawn P. Johnson ◽  
Noel A. Pelland ◽  
...  
Keyword(s):  
Adult Male ◽  
Foraging Strategies ◽  
Callorhinus Ursinus ◽  
The Sun ◽  
Male And Female ◽  
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

CARDIAC EXAMINATIONS OF ANESTHETIZED STELLER SEA LIONS (EUMETOPIAS JUBATUS), NORTHERN FUR SEALS (CALLORHINUS URSINUS), AND A WALRUS (ODOBENUS ROSMARUS)

2021 ◽  
Vol 52 (2) ◽  
Author(s):  
Rhea L. Storlund ◽  
David A.S. Rosen ◽  
Marco Margiocco ◽  
Martin Haulena ◽  
Andrew W. Trites
Keyword(s):  
Callorhinus Ursinus ◽  
Eumetopias Jubatus ◽  
Steller Sea Lions ◽  
Sea Lions ◽  
Odobenus Rosmarus ◽  
Fur Seals ◽  
Northern Fur Seals

scholarly journals Fortuitous Encounters between Seagliders and Adult Female Northern Fur Seals (Callorhinus ursinus) off the Washington (USA) Coast: Upper Ocean Variability and Links to Top Predator Behavior

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e101268 ◽  
Author(s):  
Noel A. Pelland ◽  
Jeremy T. Sterling ◽  
Mary-Anne Lea ◽  
Nicholas A. Bond ◽  
Rolf R. Ream ◽  
...  
Keyword(s):  
Adult Female ◽  
Upper Ocean ◽  
Callorhinus Ursinus ◽  
Top Predator ◽  
Ocean Variability ◽  
Fur Seals ◽  
Northern Fur Seals ◽  
Predator Behavior

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

Stimuli for Parturition in Northern Fur Seals (Callorhinus ursinus)

1984 ◽  
Vol 65 (2) ◽  
pp. 333-336 ◽  
Author(s):  
M. A. Bigg
Keyword(s):  
Callorhinus Ursinus ◽  
Fur Seals ◽  
Northern Fur Seals
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