Thermal Physiology and Energetics of Peromyscus; Ontogeny, Body Temperature, Metabolism, Insulation, and Microclimatology

Hill, Richard W.

doi:10.2307/1380747

Cited by 75 publications

(48 citation statements)

References 98 publications

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“…The metabolic response to thermal acclimation differs between various groups of mammals and birds (Hart, 1971;Heldmaier et al, 1986;Dawson and Olson, 1988;Koteja, 1996;Rose et al, 1999;Russell and Chappell, 2007). Heteromyine rodents, for example, enhance metabolism in response to cold acclimation (Hill, 1983; The Journal of Experimental Biology 215 (13) Russell and Chappell, 2007), as do most bird species (McKechnie, 2008). The results presented here for S. macroura concur with this expectation [and those that have previously found effects of thermal acclimation in small marsupials (e.g.…”

Section: Metabolic Acclimationsupporting

confidence: 87%

Flexibility in thermoregulatory physiology of two dunnarts, Sminthopsis macroura and Sminthopsis ooldea (Marsupialia; Dasyuridae)

Tomlinson

Withers

Maloney

2012

Journal of Experimental Biology

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SUMMARYStripe-faced dunnarts (Sminthopsis macroura) and Ooldea dunnarts (S. ooldea) were acclimated for 2weeks to ambient temperature (T a ) regimes of 12-22°C, 18-28°C and 25-35°C, and then measured for standard, basal (BMR) and maximum (MMR) metabolic rate using flow-through respirometry. Sminthopsis macroura maintained a stable body temperature under all experimental T a and acclimation regimes. Although its BMR was not statistically different between the three acclimation regimes, the lower end of the thermoneutral zone (TNZ) shifted from 30°C under the 18-28°C and 12-22°C acclimation regimes to 35°C under the 25-35°C acclimation regime. MMR increased significantly at the cooler acclimation regimes. EWL increased at T a 35°C, compared with lower T a , in all acclimation regimes, but an increase in evaporative water loss (EWL) at T a 10°C observed in cool acclimations did not occur at the 25-35°C regime. In contrast, S. ooldea had variable body temperature between experimental T a in all acclimation regimes, but no acclimational shift in TNZ, which was between 30 and 35°C. Neither BMR nor MMR was affected by exposure to the three acclimation regimes. EWL did not change across T a or with acclimation regime. Sminthopsis macroura was flexible in many aspects of its thermoregulation (involving energy and water balance) in response to thermal acclimation, presumably allowing it to balance its energy and water requirements over a broad range of climatic conditions. Sminthopsis ooldea seems to have an inflexible energetic and water balance in response to thermal acclimation, but has low nominal expenditure of either resource on thermoregulation because it thermoregulates less precisely than S. macroura. It seems that S. ooldea is adapted to a more narrow, stable climate.

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Section: Metabolic Acclimationsupporting

confidence: 87%

Flexibility in thermoregulatory physiology of two dunnarts, Sminthopsis macroura and Sminthopsis ooldea (Marsupialia; Dasyuridae)

Tomlinson

Withers

Maloney

2012

Journal of Experimental Biology

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“…In some species these costs can be as high as 65% of maternal energy expenditure for reproduction (Nicoll and Thompson 1987). Small body size and poor insulation of many neonates can have strong impacts on maintenance energy requirements in a cold thermal environment (Hill 1983, Leon et al 1983, Markussen et al 1985. The large neonate body size and rapid deposition of an insulative blubber layer in elephant seals may be key components in reducing energy costs of reproduction to mothers.…”

Section: Discussionmentioning

confidence: 99%

Maternal Traits and Reproductive Effort in Northern Elephant Seals

Crocker

Williams

Costa

et al. 2001

Ecology

133

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Abstract. The aim of this study was to determine the effects of maternal traits on reproductive expenditure and energy delivery to the offspring in a capital breeder, the northern elephant seal (Mirounga angustirostris). Changes in maternal and offspring energy reserves and milk-energy delivery were examined in relation to maternal parturition mass, body composition, and age in females and pups breeding at Añ o Nuevo State Reserve, California. Maternal body mass and composition had significant effects on maternal energy expenditure over lactation. Path analysis suggested no significant effects of maternal age on reproductive effort of parous females. The efficiency of milk production increased significantly with maternal age. Offspring metabolism was a relatively small component of maternal energy expenditure, with pups storing 84% of the energy obtained from milk. These effects are an important consequence of the phocid strategy for enabling terrestrial parturition despite marine feeding. This strategy has resulted in an abbreviated and highly efficient lactation system that is strongly impacted by body reserves, linking foraging success at sea with reproductive success on land. Maternal size, body composition, and age were important features of reproduction in northern elephant seals. These characteristics are rarely considered concurrently in life history studies.

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“…High capacity for NST in species that do undergo torpor also functions as a source of heat during arousal from torpor (Smith & Horwitz, 1969). In North America, both the deermouse (Peromyscus maniculatus) and the white-footed mouse (Peromyscus leucopus) experience wintertime torpor (Hill, 1983;Tannenbaum & Pivorun, 1984) and have annual cycles in NST capacity (Lynch/, 1973;Zegers & Merritt, in press). …”

Section: Introductionmentioning

confidence: 99%

“…For Peromyscus, photoperiod and ambient temperature have been studied extensively as possible cues for a variety of physiological parameters (Hill, 1983). Winter molt, regression of gonads, adrenals and [273] liver, increased occurrence of daily torpor, and hypertrophy of brown adipose tissue (BAT) of P. leucopus were stimulated by short photoperiod (Lynch, 1973;.…”

Section: Introductionmentioning

confidence: 99%

Effect of photoperiod and ambient temperature on nonshivering thermogenesis of Peromyscus maniculatus

Zegers

Merritt

1988

Acta Theriol.

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Table) Deermice were exposed to photoperiods simulating either early winter photoperiod ("winter replicates") or early spring photoperiod ("spring replicates") before experiencing 14-day treatment periods designed to assess the effects of ambient temperature and photoperiod on nonshivering thermogenesis (NST). These treatments consisted of the four combinations of low (5°C) or high (25°C) temperatures and short (8L : 16D) or long (16L : 8D) photoperiod. In both winter and spring replicates, only those mice exposed to both low temperature and short photoperiod experienced significantly elevated levels of NST. In the spring replicates, those mice exposed to both high temperature and long photoperiod experienced significant loss of NST. These results support the hypothesis that photoperiod and ambient temperature interact to trigger changes in NST.

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Thermal Physiology and Energetics of Peromyscus; Ontogeny, Body Temperature, Metabolism, Insulation, and Microclimatology

Cited by 75 publications

References 98 publications

Flexibility in thermoregulatory physiology of two dunnarts, Sminthopsis macroura and Sminthopsis ooldea (Marsupialia; Dasyuridae)

Flexibility in thermoregulatory physiology of two dunnarts, Sminthopsis macroura and Sminthopsis ooldea (Marsupialia; Dasyuridae)

Maternal Traits and Reproductive Effort in Northern Elephant Seals

Effect of photoperiod and ambient temperature on nonshivering thermogenesis of Peromyscus maniculatus

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