Effects of seasonal variation in prey abundance on field metabolism, water flux, and activity of a tropical ambush foraging snake

Keith Christian, J Webb, T Schultz, B GREEN

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    The responses of animals to seasonal food shortages can have important consequences for population dynamics and the structure and function of food webs. We investigated how an ambush foraging snake, the northern death adder Acanthophis praelongus, responds to seasonal fluctuations in prey availability in its tropical environment. In the dry season, field metabolic rates and water flux, as measured by doubly labeled water, were significantly lower than in the wet season. Unlike some other reptiles of the wet-dry tropics, death adders showed no seasonal difference in their resting metabolism. About 94% of the decrease in energy expended in the dry season was due to a decrease in activity and digestion, with lower body temperatures accounting for the remainder. In the dry season, death adders were less active and moved shorter distances between foraging sites than in the wet season. Analysis of energy expenditure suggested that adders fed no more than every 2-3 wk in the dry season but fed more frequently during the wet season. Unlike many lizards that cease feeding during the dry season, death adders remain active and attempt to maximize their energy intake year-round. � 2007 by The University of Chicago. All rights reserved.
    Original languageEnglish
    Pages (from-to)522-533
    Number of pages12
    JournalPhysiological and Biochemical Zoology
    Volume80
    Issue number5
    Publication statusPublished - 2007

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    water metabolism
    Permethrin
    Snakes
    snakes
    dry season
    seasonal variation
    foraging
    Water
    death
    wet season
    food shortages
    energy costs
    animal behavior
    body temperature
    reptiles
    food webs
    lizards
    energy intake
    population dynamics
    water

    Cite this

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    abstract = "The responses of animals to seasonal food shortages can have important consequences for population dynamics and the structure and function of food webs. We investigated how an ambush foraging snake, the northern death adder Acanthophis praelongus, responds to seasonal fluctuations in prey availability in its tropical environment. In the dry season, field metabolic rates and water flux, as measured by doubly labeled water, were significantly lower than in the wet season. Unlike some other reptiles of the wet-dry tropics, death adders showed no seasonal difference in their resting metabolism. About 94{\%} of the decrease in energy expended in the dry season was due to a decrease in activity and digestion, with lower body temperatures accounting for the remainder. In the dry season, death adders were less active and moved shorter distances between foraging sites than in the wet season. Analysis of energy expenditure suggested that adders fed no more than every 2-3 wk in the dry season but fed more frequently during the wet season. Unlike many lizards that cease feeding during the dry season, death adders remain active and attempt to maximize their energy intake year-round. � 2007 by The University of Chicago. All rights reserved.",
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    Effects of seasonal variation in prey abundance on field metabolism, water flux, and activity of a tropical ambush foraging snake. / Christian, Keith; Webb, J; Schultz, T; GREEN, B.

    In: Physiological and Biochemical Zoology, Vol. 80, No. 5, 2007, p. 522-533.

    Research output: Contribution to journalArticleResearchpeer-review

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    T1 - Effects of seasonal variation in prey abundance on field metabolism, water flux, and activity of a tropical ambush foraging snake

    AU - Christian, Keith

    AU - Webb, J

    AU - Schultz, T

    AU - GREEN, B

    PY - 2007

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    N2 - The responses of animals to seasonal food shortages can have important consequences for population dynamics and the structure and function of food webs. We investigated how an ambush foraging snake, the northern death adder Acanthophis praelongus, responds to seasonal fluctuations in prey availability in its tropical environment. In the dry season, field metabolic rates and water flux, as measured by doubly labeled water, were significantly lower than in the wet season. Unlike some other reptiles of the wet-dry tropics, death adders showed no seasonal difference in their resting metabolism. About 94% of the decrease in energy expended in the dry season was due to a decrease in activity and digestion, with lower body temperatures accounting for the remainder. In the dry season, death adders were less active and moved shorter distances between foraging sites than in the wet season. Analysis of energy expenditure suggested that adders fed no more than every 2-3 wk in the dry season but fed more frequently during the wet season. Unlike many lizards that cease feeding during the dry season, death adders remain active and attempt to maximize their energy intake year-round. � 2007 by The University of Chicago. All rights reserved.

    AB - The responses of animals to seasonal food shortages can have important consequences for population dynamics and the structure and function of food webs. We investigated how an ambush foraging snake, the northern death adder Acanthophis praelongus, responds to seasonal fluctuations in prey availability in its tropical environment. In the dry season, field metabolic rates and water flux, as measured by doubly labeled water, were significantly lower than in the wet season. Unlike some other reptiles of the wet-dry tropics, death adders showed no seasonal difference in their resting metabolism. About 94% of the decrease in energy expended in the dry season was due to a decrease in activity and digestion, with lower body temperatures accounting for the remainder. In the dry season, death adders were less active and moved shorter distances between foraging sites than in the wet season. Analysis of energy expenditure suggested that adders fed no more than every 2-3 wk in the dry season but fed more frequently during the wet season. Unlike many lizards that cease feeding during the dry season, death adders remain active and attempt to maximize their energy intake year-round. � 2007 by The University of Chicago. All rights reserved.

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    KW - Oxygen Consumption

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    SN - 0031-935X

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    ER -