Changes in lipid content of the montane vole

Rock, Paul; Williams, Olwen

doi:10.4098/at.arch.79-23

Cited by 8 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been suggested that the minimum fat content for a mammal is approximately 3 % of total body mass (Robbins 1993;Rock and Williams 1979), although this number may actually be closer to 1 -2 % of body mass (Batzli and Esseks 1992). If the estimates are correct, voles in this study carried virtually no reserves during the breeding months.…”

Section: Discussionmentioning

confidence: 77%

Seasonal variation in body composition and gut capacity of the prairie vole (Microtus ochrogaster)

Voltura¹

1997

Can. J. Zool.

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 77%

Seasonal variation in body composition and gut capacity of the prairie vole (Microtus ochrogaster)

Voltura¹

1997

Can. J. Zool.

View full text Add to dashboard Cite

show abstract

“…Unfortunately, our data would not provide a test of this hypothesis. Laboratory studies of differential thresholds of stress, similar in methodology to Rock and Williams (1979), would be necessary for such a test.…”

Section: Discussionmentioning

confidence: 99%

Differences in trapping mortality rates of northern flying squirrels

Rosenberg¹,

Anthony²

1993

Can. J. Zool.

View full text Add to dashboard Cite

1993. Differences in trapping mortality rates of northern flying squirrels. Can. J. Zool. 71: 660-663. We described trapping mortality rates of northern flying squirrel (Glaucomys sabrinus) populations in western Oregon, U.S.A., and evaluated the effects of sex, age, body mass, and number of times an individual was recaptured on these rates. Although the overall trapping mortality rates were relatively low (7%) during 16-21 day trapping sessions, we observed differential mortality rates among the sex and age cohorts. The order of mortality rates was: juvenile females (32.3 %) > juvenile males (11.1%) > adult females (5.1%) = adult males (4.1%). Overall trapping mortality rates were not affected by the number of times an individual was captured. We hypothesize that the differences we found were due to extrinsic factors (weather-related) acting on differential behavioral responses to trapping and thresholds of stress an animal can tolerate. ROSENBERG, D. K., et ANTHONY, R. G. 1993. Differences in trapping mortality rates of northern flying squirrels. Can. J. Zool. 71 : 660-663. Nous avons déterminé les taux de mortalité au piégeage dans des populations du Petit Polatouche (Glaucomys volans) de l'ouest de l'Orégon, U.S.A. et évalué les effets du sexe, de l'âge, de la masse et du nombre de recaptures sur cette mortalité. Bien que le taux de mortalité global au piégeage ait été assez bas (7%) au cours de périodes de piégeage de 16 à 21 jours, les taux variaient d'après le sexe et l'âge. La mortalité décroissait de 32,3 % chez les jeunes femelles à 11,1 % chez les jeunes mâles, à 5,1% chez les femelles adultes et à 4,1% chez les males adultes. Il n'y avait pas de relation entre le nombre de fois qu'un individu était recapturé et la mortalité globale. Nous croyons que les différences que nous avons observées sont dues à des facteurs extrinsèques (réliés au climat) agissant sur les réactions comportementales variables au piégeage et sur les niveaux de stress que chaque animal peut supporter.[Traduit par la rédaction]

show abstract

“…The aardwolves' subcutaneous fat reserves are probably one of the keys to survival during the winter months (Richardson, 1985;Anderson, 1994). Subcutaneous fat is viewed as latent metabolic energy that can be mobilized in response to caloric demands imposed by climatic stresses, nutritionally harsh periods (Rock & Williams, 1979), or changed physiological state (SchmidtNielsen, 1985). Anderson (1994) found that there were many differences between the sexes, ages and seasons with respect to the 24 different blood parameters.…”

Section: Subcutaneous Fat Fluctuationsmentioning

confidence: 99%

Aardwolf adaptations: a review

Anderson¹

2004

Transactions of the Royal Society of South Africa

View full text Add to dashboard Cite

The aardwolf Proteles cristatus has developed a number of anatomical and morphological adaptations for feeding on its termite prey. These adaptations preclude the aardwolf from feeding on other, larger (vertebrate) prey, especially during the winter months, when the T a drops below 9 º C and when Trinervitermes termites are largely unavailable. Winter is therefore a stressful period for aardwolves, as evidenced by increased juvenile mortality, a 20% decline in body mass and depletion of subcutaneous fat reserves. The aardwolf uses both physiological and behavioural means to overcome this period of food stress. An increased period is spent underground in the thermally-stable environment of the den. Den sharing is more common in the winter months and social thermoregulation may result in energy savings. While inactive the aardwolf lowers its T b (to an average of 34.1+1.6 º C during the middle of the inactive period during winter) and in some individuals this results in energy savings of up to 18%. Seasonal changes in pelage density and thermal conductance allow for more passive heat transfer during summer and improved heat retention during winter. Laboratory and field measurements of metabolic rate showed that the aardwolf has a low BMR and a low FMR (between 40 and 78% of that predicted by allometric equations). The aardwolf's metabolic rate is 11% lower during the winter months, resulting in reduced energy requirements during the period of limited food availability. Evaporative water loss rates are low, further reduced during the winter months, adaptations to survive in a desert environment and on a seasonally-unavailable food source. The aardwolf is therefore well adapted to feed on a diet of Trinervitermes termites, a food niche that has been largely unexploited by other animals, and it uses various ecological, behavioural and physiological adaptations to cope with this seasonally unavailable food source.

show abstract

Changes in lipid content of the montane vole

Cited by 8 publications

References 26 publications

Seasonal variation in body composition and gut capacity of the prairie vole (Microtus ochrogaster)

Seasonal variation in body composition and gut capacity of the prairie vole (Microtus ochrogaster)

Differences in trapping mortality rates of northern flying squirrels

Aardwolf adaptations: a review

Contact Info

Product

Resources

About