Studies on the Physiology of the Masked Shrew Sorex Cinereus

Morrison, Peter; Ryser, Fred A.; Dawe, Albert R.

doi:10.1086/physzool.32.4.30155403

Cited by 156 publications

(54 citation statements)

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“…The increased metabolic rate is also not due to the differences in body weight between Hyp and normal mice since there was a difference in metabolic rate in adult animals even when metabolic rate was calculated in a weight-independent manner (22,23). Also, direct measurement of surface area to weight ratios (which could affect rates of heat loss) demonstrated that the ratios were not different.…”

Section: Discussionmentioning

confidence: 99%

Increased Metabolic Rate in X-Linked Hypophosphatemic Mice*

Vaughn

Meyer

1986

Endocrinology

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Section: Discussionmentioning

confidence: 99%

Increased Metabolic Rate in X-Linked Hypophosphatemic Mice*

Vaughn

Meyer

1986

Endocrinology

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“…This supposition was supported by Morrison (1948). Nevertheless, the body temperature in shrews has not been ascertained higher than in other mammals (Morrison et al, 1953;Morrison et al, 1959;Layne & Redmond, 1959). Neither has this hypothesis been confirmed by studies on oxygen consumption in tissues in vitro (Redmond & Layne, 1958).…”

Section: Short Cycles In Particular Groupsmentioning

confidence: 95%

“…As has been established by M c N a b (1963) for warm-blooded animals with nocturnal ways of living, the differences between the maximum and the minimum of metabolism and the day/night ratio are high, whereas in animals with diurnal ways of living they are lower. As S. araneus is active throughout the day and the night, this activity being somewhat intenser at night (Crowcroft, 1954(Crowcroft, , 1957; Jansky & Hanak, 1960), like S. cinereus (Morrison et al, 1959) and S. vagrans obscurus (Ingles, 1960) it has its night/day ratio lower than in species characterized by nocturnal activity, but higher than in those active in the daytime.…”

Section: Young Adults From Summermentioning

confidence: 99%

“…It appeared there were no significant differences between these species. Morrison et al (1959) checked the physiological indices of S. cinereus once again, measuring, among other things, the value of oxygen consumption. Its minimum value was determined for 3 specimens in 10 measurements and it turned out to be 9.0 cc/g hr.…”

Section: Short Cycles In Particular Groupsmentioning

confidence: 99%

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Seasonal and age changes in the metabolism and activity of Sorex araneus Linnaeus 1758

Gębczyński¹

1965

Acta Theriol.

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The oxygen consumption of the Common shrew, Sorex araneus L. was measured in 70 daily runs, using a closed-circuit respirometer. The shrews were divided into five groups covering the whole life cycle of these animals: young adults (summer, autumn, winter) and old adults (spring, summer). In young adults the average daily metabolic rate is 9.91 cc 0 : /g hr (daily requirement -8.847 kcal per animal) in summer, 9.67 (8.533) in autumn, 9.66 (7.478) in winter and in old adults 9.29 (9.953) in spring and 8.28 (11.093) in summer. The seasonal fluctuations in the metabolism of shrews are smaller than in rodents and cannot be investigated in abstraction from the age of animals. Oxygen consumption was measured in 8-12 shrews at temperatures of 7, 10, 15, 20, 25, 30, and 35°C in summer and in winter. The values for summer are higher than those for winter. In the winter the thermoneutral zone lies within limits of 10-15°C, whereas in the summer it ranges from 15 to 20°C. The results support the opinion of the authors who claim that the metabolism of shrews is higher than it might be inferred from the general interrelations between the animal size and its metabolism. In the author's opinion this fact results both from the relation between the weight and the surface area of the body, which is more unfavourable than in bigger animals, and from the specific dynamic action of food.Short cycles, connected with the frequency of food intake, change with season and, in S. araneus, last from about one hour and a half in winter to about 2V2 hours in summer. The pattern of daily activity (traced on the basis of the rhythm of oxygen consumption) is also dependent on the animal age and on season. It is bimodal in autumn, winter, and spring and unimodal in young adults in summer. Old adults are nearly uniformly active in the daytime and at night in the summer.

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“…In particular, at T a 45°C, the YAF red kangaroos showed one of the highest f R s that we are aware of for any mammal, once body mass was taken into account. On an allometric basis, the fastest previously recorded f R s were 189·breaths·min -1 ·kg 0.25 for an exercising 2·g Etruscan shrew (Suncus etruscus) (Jürgens et al, 1996) and 253·breaths·min -1 ·kg 0.25 for the masked shrew (Sorex cinereus) (Morrison et al, 1959) (but see Jürgens et al, 1996). These values are less than half our measured f R of 560·breaths·min ; Table·1) for the heat-stressed YAF red kangaroos at an average body mass of 9·kg.…”

Section: Discussionmentioning

confidence: 97%

Ventilation patterns in red kangaroos (Macropus rufusDesmarest): juveniles work harder than adults at thermal extremes, but extract more oxygen per breath at thermoneutrality

Munn

Dawson

Maloney

2007

Journal of Experimental Biology

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SUMMARY Juvenile mortalities in large mammals are usually associated with environmental extremes, but the basis for this vulnerability is often unclear. Because of their high surface area to volume ratio, juveniles are expected to suffer greater thermal stresses relative to adults. Coping with thermal stress requires the ventilatory system to accommodate increases in oxygen demand and respiratory water loss at thermal extremes. Because juveniles are smaller than adults, these demands may set up different constraints on their ventilatory system. Using red kangaroos (Macropus rufus Desmarest), an arid zone species, we compared the ventilatory capabilities of juveniles and adults at thermoneutral (25°C) and extreme (–5°C and 45°C) ambient temperatures. We used an allometry to compare juvenile to adult ventilation,using predicted body mass scaling exponents for oxygen consumption (0.75),respiration rate (–0.25), tidal volume (1.0), ventilation rate (0.75)and oxygen extraction (0.0). At ambient 25°C, the juveniles' resting metabolic rate was 1.6 times that of the mature females (ml min–1 kg–0.75), accommodated by significantly higher levels of oxygen extraction of 21.4±1.8%versus 16.6±1.9% (P<0.05). At thermal extremes,juveniles showed typical mammalian responses in their ventilation, mirrored by that of adults, including higher metabolic and ventilation rates at ambient–5°C and shallow panting at 45°C. However, at thermal extremes the juvenile kangaroos needed to work harder than adults to maintain their body temperature, with higher rates of ventilation at ambient –5°C and 45°C, accomplished via larger breaths at –5°C and higher respiratory rates at 45°C.

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Studies on the Physiology of the Masked Shrew Sorex Cinereus

Cited by 156 publications

References 0 publications

Increased Metabolic Rate in X-Linked Hypophosphatemic Mice*

Increased Metabolic Rate in X-Linked Hypophosphatemic Mice*

Seasonal and age changes in the metabolism and activity of Sorex araneus Linnaeus 1758

Ventilation patterns in red kangaroos (Macropus rufusDesmarest): juveniles work harder than adults at thermal extremes, but extract more oxygen per breath at thermoneutrality

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