Temporal allocation of foraging effort in female Australian fur seals (Arctocephalus pusillus doriferus).

Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE

Original Publication: San Francisco, CA : Public Library of Science

Animal Migration* ; Feeding Behavior* ; Fur Seals*; Animals ; Australia ; Female

Across an individual's life, foraging decisions will be affected by multiple intrinsic and extrinsic drivers that act at differing timescales. This study aimed to assess how female Australian fur seals allocated foraging effort and the behavioural changes used to achieve this at three temporal scales: within a day, across a foraging trip and across the final six months of the lactation period. Foraging effort peaked during daylight hours (57% of time diving) with lulls in activity just prior to and after daylight. Dive duration reduced across the day (196 s to 168 s) but this was compensated for by an increase in the vertical travel rate (1500-1600 m·h(-1)) and a reduction in postdive duration (111-90 s). This suggests physiological constraints (digestive costs) or prey availability may be limiting mean dive durations as a day progresses. During short trips (<2.9 d), effort remained steady at 55% of time diving, whereas, on long trips (>2.9 d) effort increased up to 2-3 d and then decreased. Dive duration decreased at the same rate in short and long trips, respectively, before stabilising (long trips) between 4-5 d. Suggesting that the same processes (digestive costs or prey availability) working at the daily scale may also be present across a trip. Across the lactation period, foraging effort, dive duration and vertical travel rate increased until August, before beginning to decrease. This suggests that as the nutritional demands of the suckling pup and developing foetus increase, female effort increases to accommodate this, providing insight into the potential constraints of maternal investment in this species.

Oecologia. 1981 Jan;51(2):151-156. (PMID: 28310074)
Proc Nutr Soc. 2000 Feb;59(1):99-106. (PMID: 10828179)
Am Nat. 2007 Nov;170(5):734-43. (PMID: 17926295)
Comp Biochem Physiol A Physiol. 1997 Nov;118(3):877-81. (PMID: 9406451)
Oecologia. 1981 Sep;50(3):391-406. (PMID: 28309060)
Physiol Biochem Zool. 2002 Jul-Aug;75(4):360-8. (PMID: 12324892)
J Comp Physiol B. 2007 May;177(4):483-94. (PMID: 17294194)
Mol Ecol. 2009 May;18(9):2022-38. (PMID: 19317847)
Comp Biochem Physiol A Mol Integr Physiol. 2012 Aug;162(4):413-20. (PMID: 22561663)
Biol Lett. 2007 Feb 22;3(1):94-8. (PMID: 17443975)
Comp Biochem Physiol A Mol Integr Physiol. 2005 Aug;141(4):470-5. (PMID: 16095937)
J Exp Biol. 2004 Feb;207(Pt 6):973-82. (PMID: 14766956)
Proc Natl Acad Sci U S A. 2008 Dec 9;105(49):19114-9. (PMID: 19060190)
Philos Trans R Soc Lond B Biol Sci. 2007 Nov 29;362(1487):2151-68. (PMID: 17472918)
Physiol Biochem Zool. 2007 Jul-Aug;80(4):433-43. (PMID: 17508338)
Proc Biol Sci. 1999 Jun 7;266(1424):1127-32. (PMID: 10406130)
J Exp Biol. 2000 Dec;203(Pt 23):3655-65. (PMID: 11060226)
Comp Biochem Physiol A Mol Integr Physiol. 2006 Aug;144(4):381-94. (PMID: 16716621)
J Anim Ecol. 2006 Mar;75(2):408-20. (PMID: 16637994)
J Comp Physiol B. 1994;164(2):89-93. (PMID: 8056883)

Date Created: 20131119 Date Completed: 20141124 Latest Revision: 20211021

20240829

PMC3828376

10.1371/journal.pone.0079484

24244511