Tracking and data-logging devices attached to elephant seals do not affect individual mass gain or survival

Clive McMahon, Iain Field, Corey Bradshaw, G WHITE, Mark Hindell

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Understanding the cryptic lives of wide-ranging wild animals such as seals can be challenging, but with the advent of miniaturised telemetry and data-logging devices this is now possible and relatively straightforward. However, because marine animals have streamline bodies to reduce drag in their aquatic habitats, attaching external devices to their back or head may affect swimming performance, prey capture efficiency and ultimately, fitness. Given this, and allied welfare concerns, we assessed the short- and long-term consequences of external devices attached to southern elephant seal juveniles and adults under varying environmental conditions. We also assessed the effects of multiple deployments on individuals. There was no evidence for short-term differences in at-sea mass gain (measured as mass on arrival from a foraging trip) or long-term survival rate. The number of times that a seal carried a tracking device (ranging from 1 to 8 times) did not affect mass or estimated survival. Further, there were no tracking device effects in years of contrasting environmental conditions measured as ENSO anomalies. Consequently, we conclude that the current tracking devices available to researchers are valuable conservation tools that do not adversely affect the performance of a large marine mammal in terms of mass gain or survival probability over short (seasonal) or long (years) temporal scales. � 2008 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)71-77
    Number of pages7
    JournalJournal of Experimental Marine Biology and Ecology
    Volume360
    Issue number2
    Publication statusPublished - 2008

    Fingerprint

    Mirounga
    elephant
    logging
    seals
    environmental conditions
    Mirounga leonina
    environmental factors
    prey capture
    aquatic habitat
    back (body region)
    marine mammal
    marine mammals
    telemetry
    wild animals
    El Nino-Southern Oscillation
    drag
    fitness
    researchers
    survival rate
    foraging

    Cite this

    McMahon, Clive ; Field, Iain ; Bradshaw, Corey ; WHITE, G ; Hindell, Mark. / Tracking and data-logging devices attached to elephant seals do not affect individual mass gain or survival. In: Journal of Experimental Marine Biology and Ecology. 2008 ; Vol. 360, No. 2. pp. 71-77.
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    abstract = "Understanding the cryptic lives of wide-ranging wild animals such as seals can be challenging, but with the advent of miniaturised telemetry and data-logging devices this is now possible and relatively straightforward. However, because marine animals have streamline bodies to reduce drag in their aquatic habitats, attaching external devices to their back or head may affect swimming performance, prey capture efficiency and ultimately, fitness. Given this, and allied welfare concerns, we assessed the short- and long-term consequences of external devices attached to southern elephant seal juveniles and adults under varying environmental conditions. We also assessed the effects of multiple deployments on individuals. There was no evidence for short-term differences in at-sea mass gain (measured as mass on arrival from a foraging trip) or long-term survival rate. The number of times that a seal carried a tracking device (ranging from 1 to 8 times) did not affect mass or estimated survival. Further, there were no tracking device effects in years of contrasting environmental conditions measured as ENSO anomalies. Consequently, we conclude that the current tracking devices available to researchers are valuable conservation tools that do not adversely affect the performance of a large marine mammal in terms of mass gain or survival probability over short (seasonal) or long (years) temporal scales. � 2008 Elsevier B.V. All rights reserved.",
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    Tracking and data-logging devices attached to elephant seals do not affect individual mass gain or survival. / McMahon, Clive; Field, Iain; Bradshaw, Corey; WHITE, G; Hindell, Mark.

    In: Journal of Experimental Marine Biology and Ecology, Vol. 360, No. 2, 2008, p. 71-77.

    Research output: Contribution to journalArticleResearchpeer-review

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    AU - Field, Iain

    AU - Bradshaw, Corey

    AU - WHITE, G

    AU - Hindell, Mark

    PY - 2008

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    AB - Understanding the cryptic lives of wide-ranging wild animals such as seals can be challenging, but with the advent of miniaturised telemetry and data-logging devices this is now possible and relatively straightforward. However, because marine animals have streamline bodies to reduce drag in their aquatic habitats, attaching external devices to their back or head may affect swimming performance, prey capture efficiency and ultimately, fitness. Given this, and allied welfare concerns, we assessed the short- and long-term consequences of external devices attached to southern elephant seal juveniles and adults under varying environmental conditions. We also assessed the effects of multiple deployments on individuals. There was no evidence for short-term differences in at-sea mass gain (measured as mass on arrival from a foraging trip) or long-term survival rate. The number of times that a seal carried a tracking device (ranging from 1 to 8 times) did not affect mass or estimated survival. Further, there were no tracking device effects in years of contrasting environmental conditions measured as ENSO anomalies. Consequently, we conclude that the current tracking devices available to researchers are valuable conservation tools that do not adversely affect the performance of a large marine mammal in terms of mass gain or survival probability over short (seasonal) or long (years) temporal scales. � 2008 Elsevier B.V. All rights reserved.

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