HumphriesThomasHallEtAl2002

Référence

Humphries, M.M., Thomas, D.W., Hall, C.L., Speakman, J.R. and Kramer, D.L. (2002) The energetics of autumn mast hoarding in eastern chipmunks. Oecologia, 133(1):30-37.

Résumé

The timing and basis of the transition from energy reserve accumulation to reserve utilization in autumn may be a key determinant of winter survival in endotherms, but has rarely been examined directly in the field. In the present study we quantify the energetics of autumn mast hoarding in eastern chipmunks (Tamias striatus) to document the degree to which larder hoarding permits capitalizing on brief pulses of resource abundance and to evaluate the basis of the decision to stop hoarding and initiate hibernation. Daily energy expenditure, measured with the doubly labeled water technique, increased significantly with date and decreasing ambient temperature, eventually exceeding 3x resting metabolic rate in late autumn. Simultaneous documentation of food delivery to burrow larder hoards revealed that delivery rates were low in early autumn, extremely high for a brief period in mid-autumn, then low again in late autumn. Combining estimates of energy expenditure, consumption, and delivery yielded net energy surpluses of 1,320-4,600 kJ day-1 during the peak hoarding period, meaning total hibernation energy requirements could be acquired in 1-2 days. These results, together with measures of food availability and ambient temperature, suggest that chipmunk activity in late autumn may be affected by both the extent of hoard accumulation and thermoregulatory constraints on sustained energy expenditure. We speculate that both state-dependency and energetic ceilings on autumn hoarding behavior may enhance the capacity of the mast seeding strategy of trees to effectively swamp the foraging efforts of larder-hoarding granivores.

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@ARTICLE { HumphriesThomasHallEtAl2002,
    AUTHOR = { Humphries, M.M. and Thomas, D.W. and Hall, C.L. and Speakman, J.R. and Kramer, D.L. },
    TITLE = { The energetics of autumn mast hoarding in eastern chipmunks },
    JOURNAL = { Oecologia },
    YEAR = { 2002 },
    VOLUME = { 133 },
    PAGES = { 30-37 },
    NUMBER = { 1 },
    NOTE = { 00298549 (ISSN) Cited By (since 1996): 4 Export Date: 26 April 2007 Source: Scopus CODEN: OECOB doi: 10.1007/s00442-002-1014-5 Language of Original Document: English Correspondence Address: Humphries, M.M.; Department of Biological Sciences; University of Alberta Edmonton, Alta. T6G 2E9, Canada; email: murray_humphries@hotmail.com References: Abrams, P.A., Schmitz, O.J., The effect of risk of mortality on the foraging behaviour of animals faced with time and digestive capacity constraints (1999) Evol Ecol Res, 1, pp. 285-301; Bintz, G.L., Lipid synthesis and deposition by adult Richardson's ground squirrels in the natural environment (1988) J Comp Physiol B, 158, pp. 199-204; Blem, C.R., Avian energy storage (1990) Current Ornithology, 7, pp. 59-113. , DM Power (eds). 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    ABSTRACT = { The timing and basis of the transition from energy reserve accumulation to reserve utilization in autumn may be a key determinant of winter survival in endotherms, but has rarely been examined directly in the field. In the present study we quantify the energetics of autumn mast hoarding in eastern chipmunks (Tamias striatus) to document the degree to which larder hoarding permits capitalizing on brief pulses of resource abundance and to evaluate the basis of the decision to stop hoarding and initiate hibernation. Daily energy expenditure, measured with the doubly labeled water technique, increased significantly with date and decreasing ambient temperature, eventually exceeding 3x resting metabolic rate in late autumn. Simultaneous documentation of food delivery to burrow larder hoards revealed that delivery rates were low in early autumn, extremely high for a brief period in mid-autumn, then low again in late autumn. Combining estimates of energy expenditure, consumption, and delivery yielded net energy surpluses of 1,320-4,600 kJ day-1 during the peak hoarding period, meaning total hibernation energy requirements could be acquired in 1-2 days. These results, together with measures of food availability and ambient temperature, suggest that chipmunk activity in late autumn may be affected by both the extent of hoard accumulation and thermoregulatory constraints on sustained energy expenditure. We speculate that both state-dependency and energetic ceilings on autumn hoarding behavior may enhance the capacity of the mast seeding strategy of trees to effectively swamp the foraging efforts of larder-hoarding granivores. },
    KEYWORDS = { Energetics Food hoarding Forest ecology Hibernation Thermoregulation bioenergetics caching hibernation masting rodent thermoregulation Tamias striatus },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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