Heterothermy in Caprimulgid Birds: A Review of Inter- and Intraspecific Variation in Free-Ranging Populations

Brigham, R. Mark; McKechnie, Andrew E.; Doucette, Lisa I.; Geiser, Fritz

doi:10.1007/978-3-642-28678-0_16

Cited by 20 publications

(14 citation statements)

References 34 publications

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“…This metabolic definition (<10% or resting MR) currently restricts hibernation to mammals but this is largely due to a lack of available data from birds. A recent review of heterothermy in free-ranging Caprimulgid birds demonstrates that the common poorwill (Phalaenoptilus nuttalli) may spend several days with T b as low as 5 • C (33). Data on the metabolic responses of these birds during these periods would be very valuable.…”

Section: Metabolic Flexibility In Endotherms Definitions and Descriptmentioning

confidence: 97%

Metabolic Flexibility: Hibernation, Torpor, and Estivation

Staples

2016

Comprehensive Physiology

136

116

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Many environmental conditions can constrain the ability of animals to obtain sufficient food energy, or transform that food energy into useful chemical forms. To survive extended periods under such conditions animals must suppress metabolic rate to conserve energy, water, or oxygen. Amongst small endotherms, this metabolic suppression is accompanied by and, in some cases, facilitated by a decrease in core body temperature-hibernation or daily torpor-though significant metabolic suppression can be achieved even with only modest cooling. Within some ectotherms, winter metabolic suppression exceeds the passive effects of cooling. During dry seasons, estivating ectotherms can reduce metabolism without changes in body temperature, conserving energy reserves, and reducing gas exchange and its inevitable loss of water vapor. This overview explores the similarities and differences of metabolic suppression among these states within adult animals (excluding developmental diapause), and integrates levels of organization from the whole animal to the genome, where possible. Several similarities among these states are highlighted, including patterns and regulation of metabolic balance, fuel use, and mitochondrial metabolism. Differences among models are also apparent, particularly in whether the metabolic suppression is intrinsic to the tissue or depends on the whole-animal response. While in these hypometabolic states, tissues from many animals are tolerant of hypoxia/anoxia, ischemia/reperfusion, and disuse. These natural models may, therefore, serve as valuable and instructive models for biomedical research.

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Section: Metabolic Flexibility In Endotherms Definitions and Descriptmentioning

confidence: 97%

Metabolic Flexibility: Hibernation, Torpor, and Estivation

Staples

2016

Comprehensive Physiology

136

116

View full text Add to dashboard Cite

show abstract

“…) and Caprimulgiformes (BMR ¼ 6.38B m À0.431 ) is unexpected; low metabolic rates of Caprimulgiformes have been attributed to low activity during foraging, small muscle-to-body-mass ratio, and nocturnal nature, none of which describe Apodiformes (McNab and Bonaccorso 1995, Doucette and Geiser 2008, Brigham et al 2012.…”

Section: à0264mentioning

confidence: 90%

“…A growing body of evidence suggests that many birds from a diverse group of unrelated families may not maintain constant body temperature set points as originally assumed, and may instead demonstrate heterothermic flexibility in response to increased energetic costs of thermoregulation (McKechnie and Lovegrove 2002, McKechnie and Mzilikazi 2011, Brigham et. al.…”

Section: Introductionmentioning

confidence: 97%

“…2012. Despite heterothermy being a characteristic of most, if not all, Caprimulgiformes , Brigham et al 2012, studies that have investigated the physiological and environmental cues that prompt heterothermy are not common. The reliability of these internal and external cues that prompt heterothermy is relevant to the energetic budgets of animals, as these cues prompt individuals to abandon homeothermy when the thermoregulatory costs exceed the benefits (Geiser et al 2006).…”

Section: Introductionmentioning

confidence: 98%

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2015

The Auk

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“…2012. Despite heterothermy being a characteristic of most, if not all, Caprimulgiformes (Hackett et al 2008, Brigham et al 2012, studies that have investigated the physiological and environmental cues that prompt heterothermy are not common. The reliability of these internal and external cues that prompt heterothermy is relevant to the energetic budgets of animals, as these cues prompt individuals to abandon homeothermy when the thermoregulatory costs exceed the benefits (Geiser et al 2006).…”

Section: Introductionmentioning

confidence: 99%