Bioenergetics of cross‐ice movements by Microtus pennsylvanicus, Peromyscus leucopus and Blarina brevicauda

Bioenergetics of cross‐ice movements by Microtus pennsylvanicus, Peromyscus leucopus and... Laboratory and field experiments were conducted to investigate bioenergetics of winter dispersal and to compare winter (cross‐ice) dispersal abilities of three small mammals: Microtus pennsylvanicus, Peromyscus leucopus and Blarina brevicauda. Total metabolic rates increased with running activity and decreased as ambient temperatures increased for all species. Thermal conductance was significantly higher for running than for resting Microtus and Peromyscus, but decreased significantly with activity for Blarina. Winter dispersal abilities, calculated from treadmill experiments, increased with ambient temperature and with body size of the species. The superior dispersal ability of Microtus in comparison with Peromyscus results from the former's ability to utilize more energy reserves during running. The comparatively low winter dispersal ability of Blarina, which was less than a third of the two rodent species, resulted from its high weight specific cost of transport at winter temperatures and its relatively low energy stores and/or energy utilization during running. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecography Wiley

Bioenergetics of cross‐ice movements by Microtus pennsylvanicus, Peromyscus leucopus and Blarina brevicauda

Ecography, Volume 12 (3) – Oct 1, 1989

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Publisher
Wiley
Copyright
Copyright © 1989 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0906-7590
eISSN
1600-0587
DOI
10.1111/j.1600-0587.1989.tb00840.x
Publisher site
See Article on Publisher Site

Abstract

Laboratory and field experiments were conducted to investigate bioenergetics of winter dispersal and to compare winter (cross‐ice) dispersal abilities of three small mammals: Microtus pennsylvanicus, Peromyscus leucopus and Blarina brevicauda. Total metabolic rates increased with running activity and decreased as ambient temperatures increased for all species. Thermal conductance was significantly higher for running than for resting Microtus and Peromyscus, but decreased significantly with activity for Blarina. Winter dispersal abilities, calculated from treadmill experiments, increased with ambient temperature and with body size of the species. The superior dispersal ability of Microtus in comparison with Peromyscus results from the former's ability to utilize more energy reserves during running. The comparatively low winter dispersal ability of Blarina, which was less than a third of the two rodent species, resulted from its high weight specific cost of transport at winter temperatures and its relatively low energy stores and/or energy utilization during running.

Journal

EcographyWiley

Published: Oct 1, 1989

References

  • Scaling energetics of homeothermic vertebrates: an operational allometry
    Calder, Calder
  • Effect of cold exposure on water requirements of three species of small mammals
    Deavers, Deavers; Hudson, Hudson

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