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Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Populations of an Afrotropical Passerine Bird.
Physiol Biochem Zool 2017 Mar/Apr; 90(2):178-189PB

Abstract

Avian metabolic responses demonstrate considerable diversity under fluctuating environmental conditions, a well-studied example being the seasonal upregulation of basal metabolic rate (BMR) and summit metabolism (Msum) in temperate species experiencing harsh winters. Fewer studies have examined seasonal metabolic acclimatization in subtropical or tropical species. We investigated seasonal metabolic variation in an Afrotropical ploceid passerine, the white-browed sparrow-weaver (Plocepasser mahali; ∼47 g), at three sites along a climatic gradient of approximately 7°C in winter minimum air temperature (Ta). We measured Msum (n ≥ 10 per site per season) in a helox atmosphere, BMR of the same birds at thermoneutrality (Ta ≈ 30°C), and resting metabolic rates at 5°C ≤ Ta ≤ 20°C. Patterns of seasonal adjustments in BMR varied among populations in a manner not solely related to variation in seasonal Ta extremes, ranging from BMR ∼52% higher in winter than in summer to no seasonal difference. Greater cold tolerance was found in a population at a colder desert site, manifested as higher Msum (∼25% higher) and lower helox temperature at cold limit values compared with a milder, mesic site. Our results lend support to the idea that greater variance in the pattern of seasonal metabolic responses occurs in subtropical and tropical species compared with their temperate-zone counterparts and that factors other than Ta extremes (e.g., food availability) may be important in determining the magnitude and direction of seasonal metabolic adjustments in subtropical birds.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

28277960

Citation

Noakes, Matthew J., et al. "Seasonal Metabolic Acclimatization Varies in Direction and Magnitude Among Populations of an Afrotropical Passerine Bird." Physiological and Biochemical Zoology : PBZ, vol. 90, no. 2, 2017, pp. 178-189.
Noakes MJ, Wolf BO, McKechnie AE. Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Populations of an Afrotropical Passerine Bird. Physiol Biochem Zool. 2017;90(2):178-189.
Noakes, M. J., Wolf, B. O., & McKechnie, A. E. (2017). Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Populations of an Afrotropical Passerine Bird. Physiological and Biochemical Zoology : PBZ, 90(2), pp. 178-189. doi:10.1086/689030.
Noakes MJ, Wolf BO, McKechnie AE. Seasonal Metabolic Acclimatization Varies in Direction and Magnitude Among Populations of an Afrotropical Passerine Bird. Physiol Biochem Zool. 2017;90(2):178-189. PubMed PMID: 28277960.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Populations of an Afrotropical Passerine Bird. AU - Noakes,Matthew J, AU - Wolf,Blair O, AU - McKechnie,Andrew E, Y1 - 2016/11/02/ PY - 2017/3/10/entrez PY - 2017/3/10/pubmed PY - 2017/7/28/medline KW - acclimatization KW - basal metabolic rate KW - hypothermia KW - metabolic diversity KW - subtropical birds KW - summit metabolism SP - 178 EP - 189 JF - Physiological and biochemical zoology : PBZ JO - Physiol. Biochem. Zool. VL - 90 IS - 2 N2 - Avian metabolic responses demonstrate considerable diversity under fluctuating environmental conditions, a well-studied example being the seasonal upregulation of basal metabolic rate (BMR) and summit metabolism (Msum) in temperate species experiencing harsh winters. Fewer studies have examined seasonal metabolic acclimatization in subtropical or tropical species. We investigated seasonal metabolic variation in an Afrotropical ploceid passerine, the white-browed sparrow-weaver (Plocepasser mahali; ∼47 g), at three sites along a climatic gradient of approximately 7°C in winter minimum air temperature (Ta). We measured Msum (n ≥ 10 per site per season) in a helox atmosphere, BMR of the same birds at thermoneutrality (Ta ≈ 30°C), and resting metabolic rates at 5°C ≤ Ta ≤ 20°C. Patterns of seasonal adjustments in BMR varied among populations in a manner not solely related to variation in seasonal Ta extremes, ranging from BMR ∼52% higher in winter than in summer to no seasonal difference. Greater cold tolerance was found in a population at a colder desert site, manifested as higher Msum (∼25% higher) and lower helox temperature at cold limit values compared with a milder, mesic site. Our results lend support to the idea that greater variance in the pattern of seasonal metabolic responses occurs in subtropical and tropical species compared with their temperate-zone counterparts and that factors other than Ta extremes (e.g., food availability) may be important in determining the magnitude and direction of seasonal metabolic adjustments in subtropical birds. SN - 1537-5293 UR - https://www.unboundmedicine.com/medline/citation/28277960/Seasonal_Metabolic_Acclimatization_Varies_in_Direction_and_Magnitude_among_Populations_of_an_Afrotropical_Passerine_Bird_ L2 - http://dx.doi.org/10.1086/689030 DB - PRIME DP - Unbound Medicine ER -