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Investigating annual diving behaviour by Hooded seals (Cystophora cristata) within the Northwest Atlantic Ocean

Research output: Contribution to journalArticle

Author(s)

Julie Marie Andersen, Mette Skern-Mauritzen, Lars Boehme, Yolanda F. Wiersma, Aqqalu Rosvig-Asvid, Mike Hammill, Garry Stenson

School/Research organisations

Abstract

With the exception of relatively brief periods when they reproduce and moult, hooded seals, Cystophora cristata, spend most of the year in the open ocean where they undergo feeding migrations to either recover or prepare for the next fasting period. Valuable insights into habitat use and diving behaviour during these periods have been obtained by attaching Satellite Relay Data Loggers (SRDLs) to 51 Northwest (NW) Atlantic hooded seals (33 females and 18 males) during ice-bound fasting periods (2004−2008). Using General Additive Models (GAMs) we describe habitat use in terms of First Passage Time (FPT) and analyse how bathymetry, seasonality and FPT influence the hooded seals’ diving behaviour described by maximum dive depth, dive duration and surface duration. Adult NW Atlantic hooded seals exhibit a change in diving activity in areas where they spend >20 h by increasing maximum dive depth, dive duration and surface duration, indicating a restricted search behaviour. We found that male and female hooded seals are spatially segregated and that diving behaviour varies between sexes in relation to habitat properties and seasonality. Migration periods are described by increased dive duration for both sexes with a peak in May, October and January. Males demonstrated an increase in dive depth and dive duration towards May (post-breeding/pre-moult) and August–October (post-moult/pre-breeding) but did not show any pronounced increase in surface duration. Females dived deepest and had the highest surface duration between December and January (post-moult/pre-breeding). Our results suggest that the smaller females may have a greater need to recover from dives than that of the larger males. Horizontal segregation could have evolved as a result of a resource partitioning strategy to avoid sexual competition or that the energy requirements of males and females are different due to different energy expenditure during fasting periods.
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Original languageEnglish
Article numbere80438
JournalPLoS One
Volume8
Issue number11
DOIs
Publication statusPublished - 25 Nov 2013

    Research areas

  • Hooded seals, Feeding migrations, Habitat use, Diving behaviour, Satellite Relay Data Loggers (SRDLs), General Additive Models (GAMs), First Passage Time (FPT)

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