Seasonal effects on thermoregulatory responses of the Rock Kestrel, Falco rupicolis

Bush, Natassja G.; Brown, Mark; Downs, Colleen T.

doi:10.1016/j.jtherbio.2008.06.005

Cited by 36 publications

(28 citation statements)

References 36 publications

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“…Daily and seasonal changes in some environmental factors (such as temperature, photoperiod, food availability and quality) are important to animals in temperate climates and at high latitudes (Bush et al 2008;Polo and Carrascal 2008;Swanson and Merkord 2013). Small, northern and temperate habitat birds cope with daily and seasonal change through a wide array of strategies.…”

Section: Discussionmentioning

confidence: 99%

“…Many birds display phenotypic flexibility in maintaining energy requirements, capable of up and down body mass regulation over a period of time in response to thermal acclimation (Vézina et al 2006;Zheng et al 2013a), season (Zheng et al 2008a(Zheng et al , 2008b(Zheng et al , 2014aPetit et al 2014), elevation (Lindsay et al 2009) and latitude (Wikelski et al 2003;Zheng et al 2013bZheng et al , 2014b. Thermoregulatory responses are known to differ seasonally in birds, often dependent on the environment and region in which they reside (Bush et al 2008;Zheng et al 2008aZheng et al , 2014a. Non-migratory birds at temperate latitudes undergo drastic seasonal variation in day length, temperature and food availability (Yuni and Rose 2005;Wiersma et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The increase in winter BMR is likely the result from higher support costs for thermogenic tissues (Swanson 2010). Many small winter-active birds inhabiting temperate latitudes in the northern hemisphere increase their BMR in winter compared to that in summer (Bush et al 2008;Swanson et al 2014;Zheng et al 2014a). Birds also show a daily variation in body mass and metabolic rate, with maximum body mass and metabolic rate occurring during the day, with minimum body mass and metabolic rate occurring at night (Arens and Cooper 2005;Polo and Carrascal 2008;Lindsay et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Daily variation in body mass and thermoregulation in male Hwamei (Garrulax canorus) at different seasons

Zhao

Wang

et al. 2015

Avian Res

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Background: Acclimatization to winter conditions is an essential prerequisite for survival of small passerines of the northern temperate zone. In the present study, we measured diurnal variations in body mass, body temperature and basal metabolic rate (BMR) for seasonally acclimatized Hwameis (Garrulax canorus). Methods: Body mass was determined with a Sartorius balance. Metabolic rates of Hwameis were measured with an open-circuit respirometry system. Results: Body masses varied with time of day and were higher in daytime for Hwameis in both summer and winter, and body masses in winter were higher compared to that in summer. Body temperatures of Hwameis were higher in daytime, and the summer acclimatized birds had significantly higher body temperatures compared to the winter acclimatized birds. BMRs of Hwameis were significantly higher during the daytime compared to the nighttime of the daily cycle in both summer and winter, and Hwameis in winter had significantly higher BMRs than that in summer. Conclusions: This result showed that Hwameis rely mostly on metabolic capacity to maintain their body temperature in cold weathers, and Hwameis exhibited daily and seasonal flexibility in morphology and physiology which is important under changing environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Daily variation in body mass and thermoregulation in male Hwamei (Garrulax canorus) at different seasons

Zhao

Wang

et al. 2015

Avian Res

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“…Temperate or arctic breeding migrants, in contrast, generally have a lower metabolic rate in winter than in summer (Kersten et al, 1998;Kvist and Lindström, 2001;Wikelski et al, 2003). Patterns of resident subtropical, tropical and desert birds are inconsistent, showing no annual variation (Bush et al, 2008;Maldonado et al, 2009;Doucette and Geiser, 2008), an increase (Chamane and Downs, 2009) or a decrease in metabolic rate in winter compared with summer (Maddocks and Geiser, 2000;Smit and McKechnie, 2010). Whether variation in annual cycles in metabolic rate found in birds results from genetic differences or phenotypic flexibility is largely unknown.…”

Section: Introductionmentioning

confidence: 99%

Annual cycles of metabolic rate are genetically determined but can be shifted by phenotypic flexibility

Versteegh

Helm

Gwinner

et al. 2012

Journal of Experimental Biology

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SUMMARYBirds have adjusted their life history and physiological traits to the characteristics of the seasonally changing environments they inhabit. Annual cycles in physiology can result from phenotypic flexibility or from variation in its genetic basis. A key physiological trait that shows seasonal variation is basal metabolic rate (BMR). We studied genetic and phenotypic variation in the annual cycles of body mass, BMR and mass-specific BMR in three stonechat subspecies (Saxicola torquata) originating from environments that differ in seasonality, and in two hybrid lines. Birds were kept in a common garden set-up, under annually variable day length and at constant temperature. We also studied whether stonechats use the proximate environmental factor temperature as a cue for changes in metabolic rate, by keeping birds at two different temperature regimes. We found that the different subspecies kept in a common environment had different annual cycles of body mass, BMR ( Supplementary material available online at

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“…Tieleman et al, 2002), the effects of seasonal and environmental changes on BMR of a species (e.g. Hart, 1962;Dawson and Carey, 1976;Weathers and Caccamise, 1978;Ambrose and Bradshaw, 1988;Maddocks and Geiser, 2000;Bush et al, 2008b;Smit et al, 2008), phenotypic flexibility in BMRs of one population as a representative of a species (e.g. McKechnie et al, 2007), or have assessed population responses to climate change as a mean response at the population level (e.g.…”

Section: Introductionmentioning

confidence: 99%

Physiological variation in amethyst sunbirds (Chalcomitra amethystina) over an altitudinal gradient in winter

Lindsay

Downs

Brown

2009

Journal of Experimental Biology

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SUMMARYFlexibility of metabolic rates within a species allows for the colonization of different habitats along an altitudinal and thus temperature gradient. The distribution range of amethyst sunbirds (Chalcomitra amethystina) within southern Africa includes an altitudinal gradient from the Drakensberg to the coast of KwaZulu-Natal. We expected that over this altitudinal gradient amethyst sunbirds would exhibit variation in winter metabolic rates, particularly basal metabolic rates (BMR) and resting metabolic rate (RMR) pre-and post-acclimation. Sunbirds from three locations, Underberg (1553 m above sea level; asl), Howick (1075 m asl) and Oribi Gorge (541 m asl) were used for this study. Upon capture, metabolic rate was measured indirectly by quantifying oxygen consumption (V O2 ) using flow-through respirometry, at 5 and 25°C. Birds were then acclimated at 25°C for 6 weeks on a 12 h:12 h L:D cycle. V O2 was measured post-acclimation at eight different temperatures (15, 5, 10, 20, 30, 28, 25 and 33°C). We found little variation in winter V O2 between individuals from the same locality, whereas significant variation was observed in V O2 at the same temperatures between individuals from the different localities and thus between altitudes. In particular, winter BMR decreased significantly with decreasing altitude post-acclimation. This study emphasizes the need to understand plasticity/flexibility in metabolic rates and to acknowledge altitudinal differences within a species, to make accurate predictions about the thermal physiology of a species and its responses to changes in ambient temperatures.

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Seasonal effects on thermoregulatory responses of the Rock Kestrel, Falco rupicolis

Cited by 36 publications

References 36 publications

Daily variation in body mass and thermoregulation in male Hwamei (Garrulax canorus) at different seasons

Daily variation in body mass and thermoregulation in male Hwamei (Garrulax canorus) at different seasons

Annual cycles of metabolic rate are genetically determined but can be shifted by phenotypic flexibility

Physiological variation in amethyst sunbirds (Chalcomitra amethystina) over an altitudinal gradient in winter

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