Influence of intrinsic variation on foraging behaviour of adult female Australian fur seals

2015 ◽  
Vol 526 ◽  
pp. 227-239 ◽  
Author(s):  
AJ Hoskins ◽  
DP Costa ◽  
KE Wheatley ◽  
JR Gibbens ◽  
JPY Arnould
Keyword(s):  
Adult Female ◽  
Foraging Behaviour ◽  
Fur Seals

Foraging behaviour of sympatric Antarctic and subantarctic fur seals: does their contrasting duration of lactation make a difference?

2007 ◽  
Vol 152 (1) ◽  
pp. 213-224 ◽  
Author(s):  
Sebastián P. Luque ◽  
John P. Y. Arnould ◽  
Edward H. Miller ◽  
Yves Cherel ◽  
Christophe Guinet
Keyword(s):  
Foraging Behaviour ◽  
Fur Seals ◽  
Subantarctic Fur Seals

Effects of reproduction on activity and foraging behaviour of adult female Columbian ground squirrels

1991 ◽  
Vol 69 (8) ◽  
pp. 2209-2216 ◽  
Author(s):  
R. Bruce MacWhirter
Keyword(s):  
Adult Female ◽  
Foraging Behaviour ◽  
Ground Squirrels ◽  
Absolute Amount ◽  
Short Term ◽  
Trade Off ◽  
Active Season ◽  
Spermophilus Columbianus ◽  
Time Of Breeding ◽  
Columbian Ground Squirrels

In this study I evaluated six ways in which adult female Columbian ground squirrels (Spermophilus columbianus) potentially alter their overall activity and foraging behaviour to satisfy the increased energetic needs of reproduction, all of which may involve a trade-off with predation risk. A sample of nonparous females was obtained by administering a short-term chemosterilant at the time of breeding. Relative to nonparous females, parous females spent more time above ground, more time foraging, and less time vigilant, particularly during lactation, and had a longer active season. Thus, in absolute terms, parous females spent more time exposed to aboveground predators than did nonparous females. Parous females spent less time at burrow entrances and, during lactation, were active farther from escape burrows than were nonparous females. Parous and nonparous females did not differ in the percentage of time spent vigilant during foraging bouts. These results indicate that females respond to the energetic demands of reproduction by increasing the absolute amount of time spent foraging, which entails an acceptance of an increase in exposure to predators, and not by modifying their behaviour during foraging bouts.

Individual variation in predation on fur seals by southern sea lions (Otaria byronia) in Peru

1993 ◽  
Vol 71 (9) ◽  
pp. 1908-1911 ◽  
Author(s):  
Robert Harcourt
Keyword(s):  
Adult Female ◽  
Individual Variation ◽  
Small Proportion ◽  
South American ◽  
Adult Males ◽  
Sea Lion ◽  
Subadult Male ◽  
Sea Lions ◽  
Hunting Success ◽  
Fur Seals

Southern sea lions (Otaria byronia) were observed to prey on juvenile and adult female South American fur seals (Arctocephalus australis) at Punta San Juan, Peru (15°22′S, 75°12′W) between October 1987 and December 1988. Over the course of the study there were 165 attacks on fur seals with 33 seals killed. While both adult male and subadult male sea lions captured and killed fur seals, adult female and juvenile sea lions never acted aggressively towards fur seals. Adult males attacked fur seals on 82.4% of the occasions when they were present at the rookery, subadults on 52% of occasions. Distinctive pelage characteristics allowed some of the male sea lions to be individually identified, and differences in hunting success were observed between adults and subadults, and between five identifiable adults who hunted on at least five occasions. Motivation for attacks differed for subadults and adults, with subadult males using captured fur seals as female sea lion substitutes, guarding them from others and copulating with them, whilst adult sea lions hunted fur seals as food. However, only a small proportion of adult sea lions hunted fur seals, and with differing rates of success.

scholarly journals Post-breeding at-sea movements of three central-place foragers in relation to submesoscale fronts in the Southern Ocean around Bouvetøya

2014 ◽  
Vol 26 (5) ◽  
pp. 533-544 ◽  
Author(s):  
Andrew D. Lowther ◽  
Christian Lydersen ◽  
Martin Biuw ◽  
P.J. Nico de Bruyn ◽  
Greg J.G. Hofmeyr ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Parental Care ◽  
Breeding Season ◽  
Body Condition ◽  
Adult Female ◽  
Central Place ◽  
Polar Front ◽  
Central Place Foraging ◽  
Fur Seals ◽  
Antarctic Fur Seals

AbstractAt-sea behaviour of central-place foraging fur seals and penguins in the Southern Ocean is understudied during the latter stages of parental care and the subsequent pre-moulting period. This biologically important period is costly to investigate due to the risk (or certainty) of losing tracking instruments when the animals moult. Early in this period, parents must meet the increasing demands of larger, more mobile offspring that are still nutritionally dependent and then the parents must recover lost body condition prior to the onset of their annual moult. This study reports late-season, at-sea movement patterns of macaroni penguins, chinstrap penguins and adult female Antarctic fur seals from the subantarctic island Bouvetøya, in relation to remotely-sensed oceanographic features. Foraging trips differing significantly in direction and distance travelled compared to those performed earlier in the breeding season, coincide with the time when offspring would be expected to become independent. On these trips, macaroni penguins moved towards the Polar Front while chinstrap penguins and Antarctic fur seals moved southward. Individuals from all three species appeared to target submesoscale ocean features once they were presumed to have been released from the constraints of feeding their young and were able to travel greater distances from the colony.

Isotopic Variation Between Adult Female Guadalupe Fur Seals and Their Offspring: Implications for the Use of Neonates as Proxies for Maternal Foraging

2016 ◽  
Vol 42 (3) ◽  
pp. 268-276 ◽  
Author(s):  
Fernando R. Elorriaga-Verplancken ◽  
Ariadna Juárez-Ruiz ◽  
Marc Aquino Baleytó ◽  
Felipe Galván-Magaña ◽  
Sergio Aguíñiga-García
Keyword(s):  
Adult Female ◽  
Isotopic Variation ◽  
Fur Seals

Foraging Behaviour of Antarctic Fur Seals During Periods of Contrasting Prey Abundance

10.2307/5235 ◽  
1994 ◽  
Vol 63 (3) ◽  
pp. 703 ◽  
Author(s):  
I. L. Boyd ◽  
J. P. Y. Arnould ◽  
T. Barton ◽  
J. P. Croxall
Keyword(s):  
Foraging Behaviour ◽  
Prey Abundance ◽  
Fur Seals ◽  
Antarctic Fur Seals

Geographic variation in the foraging behaviour of South American fur seals

2018 ◽  
Vol 596 ◽  
pp. 233-245 ◽  
Author(s):  
AMM Baylis ◽  
M Tierney ◽  
RA Orben ◽  
IJ Staniland ◽  
P Brickle
Keyword(s):  
Geographic Variation ◽  
Foraging Behaviour ◽  
South American ◽  
Fur Seals
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