Partitioning of respiration between the gills and air-breathing organ in response to aquatic hypoxia and exercise in the Pacific tarpon, Megalops cyprinoides

Roger Seymour, Keith Christian, Michael Bennett, John Baldwin, R Wells, R Baudinette

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    The evolution of air-breathing organs (ABOs) is associated not only with hypoxic environments but also with activity. This investigation examines the effects of hypoxia and exercise on the partitioning of aquatic and aerial oxygen uptake in the Pacific tarpon. The two-species cosmopolitan genus Megalops is unique among teleosts in using swim bladder ABOs in the pelagic marine environment. Small fish (58-620 g) were swum at two sustainable speeds in a circulating flume respirometer in which dissolved oxygen was controlled. For fish swimming at 0.11 m s -1 in normoxia (Po 2 = 21 kPa), there was practically no air breathing, and gill oxygen uptake was 1.53 mL kg -0.67 min -1. Air breathing occurred at 0.5 breaths min -1 in hypoxia (8 kPa) at this speed, when the gills and ABOs accounted for 0.71 and 0.57 mL kg -0.67 min -1, respectively. At 0.22 m s -1 in normoxia, breathing occurred at 0.1 breaths min -1, and gill and ABO oxygen uptake were 2.08 and 0.08 mL kg -0.67 min -1, respectively. In hypoxia and 0.22 m s -1, breathing increased to 0.6 breaths min -1, and gill and ABO oxygen uptake were 1.39 and 1.28 mL kg -0.67 min -1, respectively. Aquatic hypoxia was therefore the primary stimulus for air breathing under the limited conditions of this study, but exercise augmented oxygen uptake by the ABOs, particularly in hypoxic water.
    Original languageEnglish
    Pages (from-to)760-767
    Number of pages8
    JournalPhysiological and Biochemical Zoology
    Volume77
    Issue number5
    DOIs
    Publication statusPublished - 2004

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    breathing
    hypoxia
    gills
    Respiration
    exercise
    Air
    air
    Oxygen
    uptake mechanisms
    oxygen
    normoxia
    Fishes
    Megalops cyprinoides
    Hypoxia
    Air Sacs
    swim bladder
    fish
    marine environment
    dissolved oxygen
    Water

    Cite this

    @article{b0a3a79874904777a1a05a61ef70b199,
    title = "Partitioning of respiration between the gills and air-breathing organ in response to aquatic hypoxia and exercise in the Pacific tarpon, Megalops cyprinoides",
    abstract = "The evolution of air-breathing organs (ABOs) is associated not only with hypoxic environments but also with activity. This investigation examines the effects of hypoxia and exercise on the partitioning of aquatic and aerial oxygen uptake in the Pacific tarpon. The two-species cosmopolitan genus Megalops is unique among teleosts in using swim bladder ABOs in the pelagic marine environment. Small fish (58-620 g) were swum at two sustainable speeds in a circulating flume respirometer in which dissolved oxygen was controlled. For fish swimming at 0.11 m s -1 in normoxia (Po 2 = 21 kPa), there was practically no air breathing, and gill oxygen uptake was 1.53 mL kg -0.67 min -1. Air breathing occurred at 0.5 breaths min -1 in hypoxia (8 kPa) at this speed, when the gills and ABOs accounted for 0.71 and 0.57 mL kg -0.67 min -1, respectively. At 0.22 m s -1 in normoxia, breathing occurred at 0.1 breaths min -1, and gill and ABO oxygen uptake were 2.08 and 0.08 mL kg -0.67 min -1, respectively. In hypoxia and 0.22 m s -1, breathing increased to 0.6 breaths min -1, and gill and ABO oxygen uptake were 1.39 and 1.28 mL kg -0.67 min -1, respectively. Aquatic hypoxia was therefore the primary stimulus for air breathing under the limited conditions of this study, but exercise augmented oxygen uptake by the ABOs, particularly in hypoxic water.",
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    author = "Roger Seymour and Keith Christian and Michael Bennett and John Baldwin and R Wells and R Baudinette",
    year = "2004",
    doi = "10.1086/422056",
    language = "English",
    volume = "77",
    pages = "760--767",
    journal = "Physiological Zoology",
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    }

    Partitioning of respiration between the gills and air-breathing organ in response to aquatic hypoxia and exercise in the Pacific tarpon, Megalops cyprinoides. / Seymour, Roger; Christian, Keith; Bennett, Michael; Baldwin, John; Wells, R; Baudinette, R.

    In: Physiological and Biochemical Zoology, Vol. 77, No. 5, 2004, p. 760-767.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Partitioning of respiration between the gills and air-breathing organ in response to aquatic hypoxia and exercise in the Pacific tarpon, Megalops cyprinoides

    AU - Seymour, Roger

    AU - Christian, Keith

    AU - Bennett, Michael

    AU - Baldwin, John

    AU - Wells, R

    AU - Baudinette, R

    PY - 2004

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    N2 - The evolution of air-breathing organs (ABOs) is associated not only with hypoxic environments but also with activity. This investigation examines the effects of hypoxia and exercise on the partitioning of aquatic and aerial oxygen uptake in the Pacific tarpon. The two-species cosmopolitan genus Megalops is unique among teleosts in using swim bladder ABOs in the pelagic marine environment. Small fish (58-620 g) were swum at two sustainable speeds in a circulating flume respirometer in which dissolved oxygen was controlled. For fish swimming at 0.11 m s -1 in normoxia (Po 2 = 21 kPa), there was practically no air breathing, and gill oxygen uptake was 1.53 mL kg -0.67 min -1. Air breathing occurred at 0.5 breaths min -1 in hypoxia (8 kPa) at this speed, when the gills and ABOs accounted for 0.71 and 0.57 mL kg -0.67 min -1, respectively. At 0.22 m s -1 in normoxia, breathing occurred at 0.1 breaths min -1, and gill and ABO oxygen uptake were 2.08 and 0.08 mL kg -0.67 min -1, respectively. In hypoxia and 0.22 m s -1, breathing increased to 0.6 breaths min -1, and gill and ABO oxygen uptake were 1.39 and 1.28 mL kg -0.67 min -1, respectively. Aquatic hypoxia was therefore the primary stimulus for air breathing under the limited conditions of this study, but exercise augmented oxygen uptake by the ABOs, particularly in hypoxic water.

    AB - The evolution of air-breathing organs (ABOs) is associated not only with hypoxic environments but also with activity. This investigation examines the effects of hypoxia and exercise on the partitioning of aquatic and aerial oxygen uptake in the Pacific tarpon. The two-species cosmopolitan genus Megalops is unique among teleosts in using swim bladder ABOs in the pelagic marine environment. Small fish (58-620 g) were swum at two sustainable speeds in a circulating flume respirometer in which dissolved oxygen was controlled. For fish swimming at 0.11 m s -1 in normoxia (Po 2 = 21 kPa), there was practically no air breathing, and gill oxygen uptake was 1.53 mL kg -0.67 min -1. Air breathing occurred at 0.5 breaths min -1 in hypoxia (8 kPa) at this speed, when the gills and ABOs accounted for 0.71 and 0.57 mL kg -0.67 min -1, respectively. At 0.22 m s -1 in normoxia, breathing occurred at 0.1 breaths min -1, and gill and ABO oxygen uptake were 2.08 and 0.08 mL kg -0.67 min -1, respectively. In hypoxia and 0.22 m s -1, breathing increased to 0.6 breaths min -1, and gill and ABO oxygen uptake were 1.39 and 1.28 mL kg -0.67 min -1, respectively. Aquatic hypoxia was therefore the primary stimulus for air breathing under the limited conditions of this study, but exercise augmented oxygen uptake by the ABOs, particularly in hypoxic water.

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    KW - evolution

    KW - fish

    KW - oxygen consumption

    KW - air sac

    KW - animal

    KW - anoxia

    KW - Australia

    KW - comparative study

    KW - conference paper

    KW - exercise

    KW - gill

    KW - metabolism

    KW - nonparametric test

    KW - pathophysiology

    KW - physiology

    KW - Air Sacs

    KW - Animals

    KW - Anoxia

    KW - Exertion

    KW - Fishes

    KW - Gills

    KW - Northern Territory

    KW - Oxygen

    KW - Oxygen Consumption

    KW - Statistics, Nonparametric

    KW - Megalops

    KW - Megalops atlanticus

    KW - Megalops cyprinoides

    KW - Teleostei

    U2 - 10.1086/422056

    DO - 10.1086/422056

    M3 - Article

    VL - 77

    SP - 760

    EP - 767

    JO - Physiological Zoology

    JF - Physiological Zoology

    SN - 0031-935X

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    ER -