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Behavioral evidence of thermal stress from overheating in UK breeding gray seals

Research output: Contribution to journalArticle

Author(s)

S D Twiss, N C Wright, N Dunstone, P Redman, S Moss, P P Pomeroy

School/Research organisations

Abstract

Gray seals (Halichoerus grypus) in the UK exhibit clear preferences for pupping close to pools of water on inland breeding sites. The reasons for this are unclear as seals are thought to derive all their water requirements from the metabolism of fat. Likewise, the prospect of seals overheating during the UK's cool, damp, autumnal breeding seasons, has seemed unlikely, but has not been previously explored. Here, we provide preliminary behavioral evidence of thermal stress in female gray seals breeding on the island of North Rona, Scotland. Video footage provided measures of proximity to, and the proportion of animals bathing in, pools in relation to meteorological data (temperature, mean sea-level pressure, rainfall, wind speed and direction) on four dates spread through a single breeding season. The proportion of females close to pools increased with pressure (warmer, drier conditions) and decreased on wetter days. In addition, analyses of colony-wide patterns of seal dispersion showed that females tended to be closer to pools of water at higher pressures and temperatures and at lower wind-speeds. These results provide the first evidence of thermal stress and behavioral thermoregulation through access to pools of water in a phocid breeding in temperate autumnal conditions.

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Details

Original languageEnglish
Pages (from-to)455-468
Number of pages14
JournalMarine Mammal Science
Volume18
Issue number2
DOIs
Publication statusPublished - Apr 2002

    Research areas

  • Gray seal, Halichoerus grypus, Behavioral thermoregulation, Breeding habitat, North Rona

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