Seasonal metabolic adjustments in an avian evolutionary relict restricted to mountain habitat

Oswald, Krista N; Lee, Alan T K; Smit, Ben

Title: Seasonal metabolic adjustments in an avian evolutionary relict restricted to mountain habitat
Creator: Oswald, Krista N
Creator: Lee, Alan T K
Creator: Smit, Ben
Subject: To be catalogued
Date Issued: 2021
Date: 2021
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/441638
Identifier: vital:73903
Identifier: https://doi.org/10.1016/j.jtherbio.2020.102815
Description: For endotherms, maintaining body temperature during cold winters is energetically costly.Greater increase in winter maximum thermogenic capacity (Msum) has typically been correlated with improved cold tolerance. However, seasonal studies have shown equivocal direction change in basal metabolic rate (BMR) in winter, perhaps explained by latitude or phylogeny. We examined seasonal metabolic responses in the Cape rockjumper (Chaetops frenatus; “rockjumper”), a range-restricted mountain bird. We hypothesized that, given their mountain habitat preference, rockjumpers would be physiologically specialized for cooler air temperatures compared to other subtropical passerines. We measured body condition (using the ratio of Mb/tarsus), BMR, and Msum, in wild-living rockjumpers during winter and summer (n = 12 adults in winter –– 4 females, 8 males; n = 12 adults in summer –– 6 females, 6 males). We found birds had lesser BMR and thermal conductance, and greater Msum and body condition, in winter compared to summer. .
Format: 14 pages
Format: pdf
Language: English
Relation: Journal of Thermal Biology
Relation: Oswald, K.N., Lee, A.T. and Smit, B., 2021. Seasonal metabolic adjustments in an avian evolutionary relict restricted to mountain habitat. Journal of Thermal Biology, 95, p.102815
Relation: Journal of Thermal Biology volume 95 number 1 1 14 2021 1879-0992
Rights: Publisher
Rights: Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)

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