Physiological responses in rufous-collared sparrows to thermal acclimation and seasonal acclimatization

Maldonado, Karin; Cavieres, Grisel; Veloso, Claudio; Canals, Mauricio; Sabat, Pablo

doi:10.1007/s00360-008-0317-1

Cited by 52 publications

(36 citation statements)

References 58 publications

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“…Conspecifics from an inland site (Aliwal North), in contrast, showed large winter increases in both BMR (58 %) and massspecific BMR (31 %; van de Ven et al, 2013). In the only other study comparing changes in BMR during acclimation vs acclimatization of which we are aware, a population of rufouscollared sparrows showed no significant seasonal difference in BMR, but significantly higher BMR (by ~ 19 %) when acclimated to 15 °C compared to 30 °C (Maldonado et al, 2009). …”

Section: Discussionmentioning

confidence: 77%

Phenotypic flexibility in body mass, basal metabolic rate and summit metabolism in southern red bishops (Euplectes orix): Responses to short term thermal acclimation

Ven

Mzilikazi

McKechnie

2013

Comparative Biochemistry and Physiology Part A: Molecular &

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Avian basal metabolic rate (BMR) and summit metabolism (M sum ) vary within individuals in response to seasonal acclimatization in free-ranging birds, and thermal acclimation under laboratory conditions. We examined relationships between acclimation air temperature (T acc ) and body mass (M b ), BMR and M sum in female southern red bishops (Euplectes orix) from a relatively mild coastal site and a seasonally colder, inland site. Following acclimation for 21 days to T acc ≈ 10, 22 or 35 °C, M b , BMR and M sum were all significantly and negatively related to T acc . The significant relationship between BMR and T acc did not remain after M b was included as a covariate, whereas that between M sum and T acc did. A subsequent reverse 2 acclimation protocol, where bishops were acclimated to a second T acc value and then reacclimated to the first, revealed that short-term changes in M b and BMR were completely reversible, but changes in M sum were only partially reversible. Following the reverseacclimation protocol, metabolic expansibility (M sum /BMR) varied significantly with air temperature, being greatest at T acc = 35 °C. Our data suggest that the intraspecific variation in seasonal metabolic variation previously reported for this species is at least partly driven by factors other than temperature.Keywords body mass intraspecific variation metabolic expansibility phenotypic plasticity resting metabolic rate

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Section: Discussionmentioning

confidence: 77%

Phenotypic flexibility in body mass, basal metabolic rate and summit metabolism in southern red bishops (Euplectes orix): Responses to short term thermal acclimation

Ven

Mzilikazi

McKechnie

2013

Comparative Biochemistry and Physiology Part A: Molecular &

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“…To test whether RMR differed between temperature-acclimated birds, and also between photoperiod-acclimated birds, we performed an ANCOVA, using the Tukey's post hoc test for multiple comparisons among groups. This design used the treatment (cold, warm, long photoperiod and short photoperiod) as the independent variable, and log RMR as the dependent variable (Maldonado et al, 2009). Because total RMR was correlated with M b , the effect of M b was removed using M b as the covariate.…”

Section: Statisticsmentioning

confidence: 99%

Temperature and photoperiod as environmental cues affect body mass and thermoregulation in Chinese bulbulsPycnonotus sinensis

Zhu

Lin

et al. 2017

Journal of Experimental Biology

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Seasonal changes in temperature and photoperiod are important environmental cues used by small birds to adjust their body mass (M b ) and thermogenesis. However, the relative importance of these cues with respect to seasonal adjustments in M b and thermogenesis is difficult to distinguish. In particular, the effects of temperature and photoperiod on energy metabolism and thermoregulation are not well known in many passerines. To address this problem, we measured the effects of temperature and photoperiod on M b , energy intake, resting metabolic rate (RMR), organ mass and physiological and biochemical markers of metabolic activity in the Chinese bulbul (Pycnonotus sinensis). Groups of Chinese bulbuls were acclimated in a laboratory to the following conditions: (1) warm and long photoperiod, (2) warm and short photoperiod, (3) cold and long photoperiod, and (4) cold and short photoperiod, for 4 weeks. The results indicate that Chinese bulbuls exhibit adaptive physiological regulation when exposed to different temperatures and photoperiods. M b , RMR, gross energy intake and digestible energy intake were higher in cold-acclimated than in warm-acclimated bulbuls, and in the short photoperiod than in the long photoperiod. The resultant flexibility in energy intake and RMR allows Chinese bulbuls exposed to different temperatures and photoperiods to adjust their energy balance and thermogenesis accordingly. Cold-acclimated birds had heightened state-4 respiration and cytochrome c oxidase activity in their liver and muscle tissue compared with warmacclimated birds indicating the cellular mechanisms underlying their adaptive thermogenesis. Temperature appears to be a primary cue for adjusting energy budget and thermogenic ability in Chinese bulbuls; photoperiod appears to intensify temperature-induced changes in energy metabolism and thermoregulation.

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“…More recently, data on seasonal metabolic adjustments have also become available for a number of subtropical and tropical species (Maddocks and Geiser 2000;Zheng et al 2008a;Maldonado et al 2009;Smit and McKechnie 2010;Wells and Schaeffer 2012). Unlike their temperate-zone counterparts, many of these species decrease basal metabolic rate (BMR) in winter.…”

Section: Introductionmentioning

confidence: 99%

Global patterns of seasonal acclimatization in avian resting metabolic rates

2015

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The adjustment of resting metabolic rates represents an important component of avian seasonal acclimatization, with recent studies revealing substantial differences between summer and winter in birds from a wide range of latitudes. We compared seasonal variation in basal metabolic rate (BMR) and summit metabolism (Msum) between temperate and tropical/subtropical latitudes, and examined correlations with latitude and temperature. The direction and magnitude of seasonal adjustments in BMR are broadly related to temperature and latitude, but are significantly more variable among tropical and subtropical species compared to those inhabiting temperate zones. Winter adjustments in BMR among subtropical species, when expressed relative to summer 1 values, range from decreases of approximately 35 % to increases of more than 60 %, whereas the majority of temperate-zone species show increases in BMR during winter. Relatively few seasonal Msum data exist for tropical/subtropical species, but those that are available involve responses ranging from winter decreases to increases of similar magnitude to those characteristic of many temperate-zone species. Recent studies also highlight the substantial variation in seasonal adjustments that may occur within species, and reiterate the need for further investigations of the relative roles of environmental variables such as temperature and food availability as determinants of seasonal metabolic variation.

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Physiological responses in rufous-collared sparrows to thermal acclimation and seasonal acclimatization

Cited by 52 publications

References 58 publications

Phenotypic flexibility in body mass, basal metabolic rate and summit metabolism in southern red bishops (Euplectes orix): Responses to short term thermal acclimation

Phenotypic flexibility in body mass, basal metabolic rate and summit metabolism in southern red bishops (Euplectes orix): Responses to short term thermal acclimation

Temperature and photoperiod as environmental cues affect body mass and thermoregulation in Chinese bulbulsPycnonotus sinensis

Global patterns of seasonal acclimatization in avian resting metabolic rates

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