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Thread: The physiology of bottlenose dolphins (tursiops

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    Post The physiology of bottlenose dolphins (tursiops

    THE PHYSIOLOGY OF BOTTLENOSE DOLPHINS (
    TURSIOPS
    TRUNCATUS): HEART RATE, METABOLIC RATE AND PLASMA
    LACTATE CONCENTRATION DURING EXERCISE


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    Summary
    Despite speculation about the swimming efficiency of cetaceans, few studies have
    investigated the exercise physiology of these mammals. In view of this, we examined the
    physiological responses and locomotor energetics of two exercising adult


    T u r s i o p s
    t r u n c a t u s

    . Oxygen consumption, heart rate, respiratory rate and post-exercise blood lactate
    concentration were determined for animals either pushing against a load cell or swimming
    next to a boat. Many of the energetic and cardiorespiratory responses of exercising
    dolphins were similar to those of terrestrial mammals. Average heart rate, respiratory rate
    and oxygen consumption for dolphins pushing against a load cell increased linearly with
    exercise levels up to 58kg for a female dolphin and 85kg for a male. Oxygen consumption
    did not increase with higher loads. Maximum rate of oxygen consumption (

    Omax) ranged
    from 19.8 to 29.4 m lO

    2 k g21 m i n21, which was 7–11 times the calculated standard
    metabolic rate (

    Os t d) of the dolphins. Blood lactate concentration increased with exercise
    loads that exceeded

    Omax. The maximum lactate concentration was 101.4m gd l21
    ( 1 1 . 3m m o l l


    21) for the male, and 120.6 m gd l21 ( 1 3 . 6m m o l l21) for the female. When
    swimming at 2.1ms

    21, heart rate, respiratory rate and post-exercise blood lactate
    concentration of the dolphins were not significantly different from values at rest. The cost
    of transport at this speed was 1.290.05J k g

    21 m i n21. The energetic profile of the
    exercising bottlenose dolphin resembles that of a relatively sedentary mammal if the
    exercise variables defined for terrestrial mammals are used. However, the energetic cost of
    swimming for this cetacean is low in comparison to that of other aquatic and semi-aquatic
    m a m m a l s .

    Last edited by sarlo518; 25th December 2010 at 10:19 AM.
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    thanks man
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    Such file does not exist or it has been removed for infringement of copyrights.
    could u please reupload it? thanks ^ ^
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    reuploaded, enjoy
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