Cold-acclimation in Peromyscus: Temporal effects and individual variation in maximum metabolism and ventilatory traits

Enrico L. Rezende, Mark A. Chappell, Kimberly A. Hammond

Resultado de la investigación: Article

38 Citas (Scopus)

Resumen

Thermal acclimation in small endotherms provides an excellent model for the study of physiological plasticity, as energy requirements can be easily manipulated and the results are relevant for natural conditions. Nevertheless, how physiology changes throughout acclimation, and how individuals vary in their response to acclimation, remain poorly understood. Here we describe a high temporalresolution study of cold acclimation in the deer mouse Peromyscus maniculatus. The experimental design was based on repeated measures at short intervals throughout cold acclimation, with controls (maintained at constant temperature) for measurement artifacts. We monitored body mass, maximum metabolic rate in cold exposure and ventilatory traits (respiratory frequency, tidal and minute volume and oxygen extraction) for 3 weeks at 23°C. Then, half of the individuals were held for 7 weeks at 5°C. Body mass was differently affected by cold acclimation depending on sex. Maximal metabolism (V̇O2max) increased significantly during the first week of cold acclimation, 'overshot' after 5 weeks and dropped to a plateau about 34% above control values at week 7. Similarly, ventilatory traits increased during cold acclimation, though responses were different in their kinetics and magnitude. Body mass, maximum metabolism, and most ventilatory traits were repeatable after 7 weeks in control and cold-acclimated animals. However, repeatability tended to be lower in the cold-acclimated group, especially while animals were still acclimating. Our results show that acclimation effects may be under- and/or overestimated, depending on when trials are performed, and that different traits respond differently, and at different rates, to acclimation. Hence, future studies should be designed to ensure that animals have attained steady-state values in acclimation experiments.

Idioma originalEnglish
Páginas (desde-hasta)295-305
Número de páginas11
PublicaciónJournal of Experimental Biology
Volumen207
N.º2
DOI
EstadoPublished - ene 2004

Huella dactilar

Peromyscus
Acclimatization
individual variation
acclimation
metabolism
body mass
animal
cold
effect
animals
Peromyscus maniculatus
Tidal Volume
respiratory rate
energy requirements
experimental design
Artifacts
repeatability
deer
physiology
plasticity

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Agricultural and Biological Sciences (miscellaneous)
  • Animal Science and Zoology
  • Aquatic Science
  • Molecular Biology
  • Insect Science
  • Ecology, Evolution, Behavior and Systematics
  • Physiology

Citar esto

Rezende, Enrico L. ; Chappell, Mark A. ; Hammond, Kimberly A. / Cold-acclimation in Peromyscus : Temporal effects and individual variation in maximum metabolism and ventilatory traits. En: Journal of Experimental Biology. 2004 ; Vol. 207, N.º 2. pp. 295-305.
@article{fc8a6a91ba494c6e9423dfa4536030e7,
title = "Cold-acclimation in Peromyscus: Temporal effects and individual variation in maximum metabolism and ventilatory traits",
abstract = "Thermal acclimation in small endotherms provides an excellent model for the study of physiological plasticity, as energy requirements can be easily manipulated and the results are relevant for natural conditions. Nevertheless, how physiology changes throughout acclimation, and how individuals vary in their response to acclimation, remain poorly understood. Here we describe a high temporalresolution study of cold acclimation in the deer mouse Peromyscus maniculatus. The experimental design was based on repeated measures at short intervals throughout cold acclimation, with controls (maintained at constant temperature) for measurement artifacts. We monitored body mass, maximum metabolic rate in cold exposure and ventilatory traits (respiratory frequency, tidal and minute volume and oxygen extraction) for 3 weeks at 23°C. Then, half of the individuals were held for 7 weeks at 5°C. Body mass was differently affected by cold acclimation depending on sex. Maximal metabolism (V̇O2max) increased significantly during the first week of cold acclimation, 'overshot' after 5 weeks and dropped to a plateau about 34{\%} above control values at week 7. Similarly, ventilatory traits increased during cold acclimation, though responses were different in their kinetics and magnitude. Body mass, maximum metabolism, and most ventilatory traits were repeatable after 7 weeks in control and cold-acclimated animals. However, repeatability tended to be lower in the cold-acclimated group, especially while animals were still acclimating. Our results show that acclimation effects may be under- and/or overestimated, depending on when trials are performed, and that different traits respond differently, and at different rates, to acclimation. Hence, future studies should be designed to ensure that animals have attained steady-state values in acclimation experiments.",
keywords = "Acclimation, Ambient temperature, Maximal oxygen consumption, Peromyscus maniculatus, Physiological plasticity, Repeatability, Thermogenesis, Ventilation",
author = "Rezende, {Enrico L.} and Chappell, {Mark A.} and Hammond, {Kimberly A.}",
year = "2004",
month = "1",
doi = "10.1242/jeb.00760",
language = "English",
volume = "207",
pages = "295--305",
journal = "Journal of Experimental Biology",
issn = "0022-0949",
publisher = "Company of Biologists Ltd",
number = "2",

}

Cold-acclimation in Peromyscus : Temporal effects and individual variation in maximum metabolism and ventilatory traits. / Rezende, Enrico L.; Chappell, Mark A.; Hammond, Kimberly A.

En: Journal of Experimental Biology, Vol. 207, N.º 2, 01.2004, p. 295-305.

Resultado de la investigación: Article

TY - JOUR

T1 - Cold-acclimation in Peromyscus

T2 - Temporal effects and individual variation in maximum metabolism and ventilatory traits

AU - Rezende, Enrico L.

AU - Chappell, Mark A.

AU - Hammond, Kimberly A.

PY - 2004/1

Y1 - 2004/1

N2 - Thermal acclimation in small endotherms provides an excellent model for the study of physiological plasticity, as energy requirements can be easily manipulated and the results are relevant for natural conditions. Nevertheless, how physiology changes throughout acclimation, and how individuals vary in their response to acclimation, remain poorly understood. Here we describe a high temporalresolution study of cold acclimation in the deer mouse Peromyscus maniculatus. The experimental design was based on repeated measures at short intervals throughout cold acclimation, with controls (maintained at constant temperature) for measurement artifacts. We monitored body mass, maximum metabolic rate in cold exposure and ventilatory traits (respiratory frequency, tidal and minute volume and oxygen extraction) for 3 weeks at 23°C. Then, half of the individuals were held for 7 weeks at 5°C. Body mass was differently affected by cold acclimation depending on sex. Maximal metabolism (V̇O2max) increased significantly during the first week of cold acclimation, 'overshot' after 5 weeks and dropped to a plateau about 34% above control values at week 7. Similarly, ventilatory traits increased during cold acclimation, though responses were different in their kinetics and magnitude. Body mass, maximum metabolism, and most ventilatory traits were repeatable after 7 weeks in control and cold-acclimated animals. However, repeatability tended to be lower in the cold-acclimated group, especially while animals were still acclimating. Our results show that acclimation effects may be under- and/or overestimated, depending on when trials are performed, and that different traits respond differently, and at different rates, to acclimation. Hence, future studies should be designed to ensure that animals have attained steady-state values in acclimation experiments.

AB - Thermal acclimation in small endotherms provides an excellent model for the study of physiological plasticity, as energy requirements can be easily manipulated and the results are relevant for natural conditions. Nevertheless, how physiology changes throughout acclimation, and how individuals vary in their response to acclimation, remain poorly understood. Here we describe a high temporalresolution study of cold acclimation in the deer mouse Peromyscus maniculatus. The experimental design was based on repeated measures at short intervals throughout cold acclimation, with controls (maintained at constant temperature) for measurement artifacts. We monitored body mass, maximum metabolic rate in cold exposure and ventilatory traits (respiratory frequency, tidal and minute volume and oxygen extraction) for 3 weeks at 23°C. Then, half of the individuals were held for 7 weeks at 5°C. Body mass was differently affected by cold acclimation depending on sex. Maximal metabolism (V̇O2max) increased significantly during the first week of cold acclimation, 'overshot' after 5 weeks and dropped to a plateau about 34% above control values at week 7. Similarly, ventilatory traits increased during cold acclimation, though responses were different in their kinetics and magnitude. Body mass, maximum metabolism, and most ventilatory traits were repeatable after 7 weeks in control and cold-acclimated animals. However, repeatability tended to be lower in the cold-acclimated group, especially while animals were still acclimating. Our results show that acclimation effects may be under- and/or overestimated, depending on when trials are performed, and that different traits respond differently, and at different rates, to acclimation. Hence, future studies should be designed to ensure that animals have attained steady-state values in acclimation experiments.

KW - Acclimation

KW - Ambient temperature

KW - Maximal oxygen consumption

KW - Peromyscus maniculatus

KW - Physiological plasticity

KW - Repeatability

KW - Thermogenesis

KW - Ventilation

UR - http://www.scopus.com/inward/record.url?scp=1642423541&partnerID=8YFLogxK

U2 - 10.1242/jeb.00760

DO - 10.1242/jeb.00760

M3 - Article

C2 - 14668313

AN - SCOPUS:1642423541

VL - 207

SP - 295

EP - 305

JO - Journal of Experimental Biology

JF - Journal of Experimental Biology

SN - 0022-0949

IS - 2

ER -