Effects of short-term acclimation on thermoregulatory responses of the rock kestrel, Falco rupicolus

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

doi:10.1016/j.jtherbio.2008.06.009

Cited by 14 publications

(5 citation statements)

References 24 publications

(40 reference statements)

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“…Resting metabolic rate (RMR) was measured as the average minimal oxygen consumption under post‐absorptive digestive conditions during the resting phase of the daily cycle in an open circuit respirometer (McNab, ). Birds were individually placed in an air‐sealed chamber (3L) inside a climate cabinet at 27°C, within the thermoneutral zone of similarly sized falcons as the lesser kestrel (Shapiro and Weathers, ; Bush et al, ). The respirometer consisted of two independent sets consisting of 4 and 8 channels, respectively.…”

Section: Methodsmentioning

confidence: 99%

Determinants and short‐term physiological consequences of PHA immune response in lesser kestrel nestlings

et al. 2014

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Individual immune responses are likely affected by genetic, physiological, and environmental determinants. We studied the determinants and short-term consequences of Phytohaemagglutinin (PHA) induced immune response, a commonly used immune challenge eliciting both innate and acquired immunity, on lesser kestrel (Falco naumanni) nestlings in semi-captivity conditions and with a homogeneous diet composition. We conducted a repeated measures analyses of a set of blood parameters (carotenoids, triglycerides, β-hydroxybutyrate, cholesterol, uric acid, urea, total proteins, and total antioxidant capacity), metabolic (resting metabolic rate), genotypic (MHC class II B heterozygosity), and biometric (body mass) variables. PHA challenge did not affect the studied physiological parameters on a short-term basis (<12 hr), except plasma concentrations of triglycerides and carotenoids, which decreased and increased, respectively. Uric acid was the only physiological parameter correlated with the PHA induced immune response (skin swelling), but the change of body mass, cholesterol, total antioxidant capacity, and triglycerides between sessions (i.e., post-pre treatment) were also positively correlated to PHA response. No relationships were detected between MHC gene heterozygosity or resting metabolic rate and PHA response. Our results indicate that PHA response in lesser kestrel nestlings growing in optimal conditions does not imply a severe energetic cost 12 hr after challenge, but is condition-dependent as a rapid mobilization of carotenoids and decrease of triglycerides is elicited on a short-term basis.

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Section: Methodsmentioning

confidence: 99%

Determinants and short‐term physiological consequences of PHA immune response in lesser kestrel nestlings

et al. 2014

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“…As a consequence, the calculated metabolic suitability variable (MS) may underestimate the physiologically suitable climatic conditions at higher T A for E. hortulana . Second, our calculations make use of static values for TNZ and T B , even though breadth and position of the TNZ can vary due to seasonal metabolic acclimatization or short‐term temperature changes (Chaffee and Roberts , Bush et al ). Third, endotherms may furthermore exhibit individual, geographical and temporal variation of T B which could represent an adaptive strategy to changing climatic conditions (Angilletta et al , Smit et al ).…”

Section: Discussionmentioning

confidence: 99%

A framework integrating physiology, dispersal and land‐use to project species ranges under climate change

Methorst

Böhning‐Gaese

Khaliq

et al. 2017

Journal of Avian Biology

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To study the potential effects of climate change on species, one of the most popular approaches are species distribution models (SDMs). However, they usually fail to consider important species‐specific biological traits, such as species’ physiological capacities or dispersal ability. Furthermore, there is consensus that climate change does not influence species distributions in isolation, but together with other anthropogenic impacts such as land‐use change, even though studies investigating the relative impacts of different threats on species and their geographic ranges are still rare. Here we propose a novel integrative approach which produces refined future range projections by combining SDMs based on distribution, climate, and physiological tolerance data with empirical data on dispersal ability as well as current and future land‐use. Range projections based on different combinations of these factors show strong variation in projected range size for our study species Emberiza hortulana. Using climate and physiological data alone, strong range gains are projected. However, when we account for land‐use change and dispersal ability, future range‐gain may even turn into a future range loss. Our study highlights the importance of accounting for biological traits and processes in species distribution models and of considering the additive effects of climate and land‐use change to achieve more reliable range projections. Furthermore, with our approach we present a new tool to assess species’ vulnerability to climate change which can be easily applied to multiple species.

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“…Altitudinal subpopulations still showed differences in MR postacclimation, thus indicating that captive-bred populations of birds would not represent the entire species as well as might be assumed, unless altitudinal origin of the original population is known, and laboratory populations represent subpopulations over the entire altitudinal gradient occupied by the species. It is also difficult to assess the end point of thermal acclimation (Rezende et al, 2004;Bush et al, 2008a) and thus it is possible that this was merely a stage in the ability of amethyst sunbirds to change their thermal phenotype over a longer period of time.…”

Section: Discussionmentioning

confidence: 99%

“…However small homeotherms have higher energetic demands at colder temperatures and require physiological adjustments in metabolic rate or insulation to counteract this (Downs and Brown, 2002;Soobramoney et al, 2003). As a result of this many birds display phenotypic flexibility in maintenance energy requirements, and are able to up-or downregulate basal metabolic rate (BMR) over a period of time during thermal acclimation (McKechnie et al, 2007;Bush et al, 2008a). Recent evidence suggests that winter BMR of species living in highly seasonal environments reflects the conditions in which the animal existed immediately prior to metabolic measurements being taken (McKechnie, 2008) and thus it becomes important to differentiate metabolic measurements made pre-acclimation and those made post-acclimation (Bush et al, 2008a;Smit et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…As a result of this many birds display phenotypic flexibility in maintenance energy requirements, and are able to up-or downregulate basal metabolic rate (BMR) over a period of time during thermal acclimation (McKechnie et al, 2007;Bush et al, 2008a). Recent evidence suggests that winter BMR of species living in highly seasonal environments reflects the conditions in which the animal existed immediately prior to metabolic measurements being taken (McKechnie, 2008) and thus it becomes important to differentiate metabolic measurements made pre-acclimation and those made post-acclimation (Bush et al, 2008a;Smit et al, 2008). Klaasen et al (Klaasen et al, 2004) suggested that it is important to recognize whether seasonal changes in BMR represent a separate acclimation or acclimatization response or merely variation in working capacity.…”

Section: Introductionmentioning

confidence: 99%

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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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Effects of short-term acclimation on thermoregulatory responses of the rock kestrel, Falco rupicolus

Cited by 14 publications

References 24 publications

Determinants and short‐term physiological consequences of PHA immune response in lesser kestrel nestlings

Determinants and short‐term physiological consequences of PHA immune response in lesser kestrel nestlings

A framework integrating physiology, dispersal and land‐use to project species ranges under climate change

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

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