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A comparative analysis of thermogenic capacity and cold tolerance in small birds.
J Exp Biol. 2006 Feb; 209(Pt 3):466-74.JE

Abstract

Small birds showing marked seasonal changes in cold tolerance also exhibit winter increases in summit metabolic rate (Msum=maximum cold-induced thermogenesis or thermogenic capacity) relative to summer birds. However, some birds show modest seasonal changes in cold tolerance without winter increases in Msum and others exhibit large seasonal changes in cold tolerance with only minor changes in Msum. Thus, the degree of correlation between cold tolerance and Msum is uncertain and no interspecific study has directly addressed this question. In this study, we measured cold tolerance and Msum in summer- (21 species) and winter- (11 species) acclimatized birds from southeastern South Dakota. Msum was measured as the maximum oxygen consumption attained during exposure of individual birds to a declining series of temperatures in 79% helium/21% oxygen (helox). Cold tolerance was measured as the temperature at cold limit (TCL), which is the helox temperature that induced hypothermia in individual birds. Residuals from allometric regressions of logMsum and logTCL were significantly and negatively related for summer (R2=0.34, P=0.006) and winter (R2=0.40, P=0.037) birds. Data were also subjected to a comparative analyses with phylogenetically independent contrasts to remove potential confounding effects of phylogeny, and results were similar to the non-phylogenetic analyses, with significant negative correlations in both summer (R2=0.47, P<0.001) and winter (R2=0.40, P=0.049). Thus, birds with high Msum tended to show reduced TCL (i.e. high cold tolerance), suggesting that cold tolerance and summit metabolism are phenotypically linked in small birds.

Authors+Show Affiliations

Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA. dlswanso@usd.eduNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

16424096

Citation

Swanson, David L., and Eric T. Liknes. "A Comparative Analysis of Thermogenic Capacity and Cold Tolerance in Small Birds." The Journal of Experimental Biology, vol. 209, no. Pt 3, 2006, pp. 466-74.
Swanson DL, Liknes ET. A comparative analysis of thermogenic capacity and cold tolerance in small birds. J Exp Biol. 2006;209(Pt 3):466-74.
Swanson, D. L., & Liknes, E. T. (2006). A comparative analysis of thermogenic capacity and cold tolerance in small birds. The Journal of Experimental Biology, 209(Pt 3), 466-74.
Swanson DL, Liknes ET. A Comparative Analysis of Thermogenic Capacity and Cold Tolerance in Small Birds. J Exp Biol. 2006;209(Pt 3):466-74. PubMed PMID: 16424096.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A comparative analysis of thermogenic capacity and cold tolerance in small birds. AU - Swanson,David L, AU - Liknes,Eric T, PY - 2006/1/21/pubmed PY - 2006/5/18/medline PY - 2006/1/21/entrez SP - 466 EP - 74 JF - The Journal of experimental biology JO - J Exp Biol VL - 209 IS - Pt 3 N2 - Small birds showing marked seasonal changes in cold tolerance also exhibit winter increases in summit metabolic rate (Msum=maximum cold-induced thermogenesis or thermogenic capacity) relative to summer birds. However, some birds show modest seasonal changes in cold tolerance without winter increases in Msum and others exhibit large seasonal changes in cold tolerance with only minor changes in Msum. Thus, the degree of correlation between cold tolerance and Msum is uncertain and no interspecific study has directly addressed this question. In this study, we measured cold tolerance and Msum in summer- (21 species) and winter- (11 species) acclimatized birds from southeastern South Dakota. Msum was measured as the maximum oxygen consumption attained during exposure of individual birds to a declining series of temperatures in 79% helium/21% oxygen (helox). Cold tolerance was measured as the temperature at cold limit (TCL), which is the helox temperature that induced hypothermia in individual birds. Residuals from allometric regressions of logMsum and logTCL were significantly and negatively related for summer (R2=0.34, P=0.006) and winter (R2=0.40, P=0.037) birds. Data were also subjected to a comparative analyses with phylogenetically independent contrasts to remove potential confounding effects of phylogeny, and results were similar to the non-phylogenetic analyses, with significant negative correlations in both summer (R2=0.47, P<0.001) and winter (R2=0.40, P=0.049). Thus, birds with high Msum tended to show reduced TCL (i.e. high cold tolerance), suggesting that cold tolerance and summit metabolism are phenotypically linked in small birds. SN - 0022-0949 UR - https://www.unboundmedicine.com/medline/citation/16424096/A_comparative_analysis_of_thermogenic_capacity_and_cold_tolerance_in_small_birds_ L2 - https://journals.biologists.com/jeb/article-lookup/doi/10.1242/jeb.02024 DB - PRIME DP - Unbound Medicine ER -