Dietary Effects on Prediction of Body Mass Changes in Birds by Plasma Metabolites

Cerasale, David J.; Guglielmo, Christopher G.

doi:10.1093/auk/123.3.836

Cited by 22 publications

(29 citation statements)

References 25 publications

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“…The effects of feeding and fasting on plasma metabolites in birds have been measured in numerous studies (Jenni‐Eiermann and Jenni , , Guglielmo et al , Cerasale and Guglielmo ). Generally, short‐term fasting is associated with increased β‐OH‐butyrate and low concentrations of triglycerides and uric acid.…”

Section: Discussionmentioning

confidence: 99%

“…of Montana, Missoula, MT, USA. Twelve yellow‐rumped warblers S. coronata auduboni were captured locally in August and September 2003, and first used for a study (Cerasale and Guglielmo ) which was complete in January 2004. We tested them between 28 April and 3 June (basal metabolic rate; n = 12) and between 17 June and 1 July, 2004 (exercise; n = 7; five birds died before exercise experiments began).…”

Section: Methodsmentioning

confidence: 99%

“…The fruit diet was based on a diet from Afik et al () and contained ripe bananas, wheat germ, and synthetic ingredients. The mixed diet was fully synthetic, and had previously been fed to warblers as a low‐lipid diet by Cerasale and Guglielmo (). The approximate macronutrient compositions (% dry mass carbohydrate/protein/fat) of the fruit and mixed diets were 51/14/5 and 40/32/9, respectively.…”

Section: Methodsmentioning

confidence: 99%

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The effects of dietary macronutrients on flight ability, energetics, and fuel metabolism of yellow‐rumped warblers Setophaga coronata

Guglielmo

Gerson

Price

et al. 2017

Journal of Avian Biology

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The catabolism of protein from organs and muscles during migratory flight is necessary to produce glucose, key metabolic intermediates, and water, but may have negative effects on flight range and refueling at stopovers. We tested the hypothesis, suggested by previous studies, that birds that eat high‐protein insect diets use more protein for fuel in flight than those that eat high‐carbohydrate fruits. First, we fed migratory yellow‐rumped warblers synthetic fruit or mixed insect/fruit diets, and measured metabolic rates and fuel mixture under basal conditions and during exercise in a hop/hover wheel respirometer. Birds eating the fruit diet had greater plasma triglyceride and non‐esterified fatty acid concentrations, and the higher protein mixed diet increased plasma uric acid only during feeding. Diet did not affect metabolic rates or the fuel mixture under resting or exercise conditions. We then fed yellow‐rumped warblers synthetic diets that differed only in the relative proportion of carbohydrate and protein (60:15 versus 15:60 as % dry mass) and tested them in wind tunnel flights lasting up to six hours. Birds fed the high carbohydrate diet became heavier and fatter than when fed the high protein diet. Plasma uric acid concentration was increased and plasma phospholipid concentration was decreased by the high protein diet in the pre‐flight state (after a 3 h fast), but diet only affected plasma phospholipids during flight (lower in high protein birds). Neither diet nor amount of body fat affected the rate of loss of lean mass or fat during flight. Inter‐individual or seasonal differences in diet do not appear to influence the amount of protein catabolized during endurance flight. However, birds fed the high carbohydrate diet had greater voluntary flight duration, independent of body fatness, suggesting that there may be other performance benefits of high carbohydrate diets for migratory birds.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The effects of dietary macronutrients on flight ability, energetics, and fuel metabolism of yellow‐rumped warblers Setophaga coronata

Guglielmo

Gerson

Price

et al. 2017

Journal of Avian Biology

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“…Jenni & Jenni‐Eiermann , Williams et al . , Cerasale & Guglielmo ), that blood metabolites could be used to infer the quality of wintering habitat for non‐migratory birds.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, little is known about how weather conditions may influence variability in daily levels of blood metabolites such as TRIG and BUTY (Williams et al . , Cerasale & Guglielmo , Swanson & Thomas ).…”

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confidence: 97%

Daily variation in markers of nutritional condition in wintering Black‐capped Chickadees Poecile atricapillus

Mandin

Vézina

2012

Ibis

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The plasma metabolites triglycerides (TRIG) and β‐hydroxybutyrate (BUTY) are used as indices of nutritional condition in migrating birds during refuelling and can provide a measure of relative fattening rates in individual birds. Because non‐migratory birds wintering at northern latitudes also fatten on a daily basis to support their overnight fast, blood metabolites could provide a useful tool to measure individual performance in energy acquisition. However, daily patterns of metabolite change may differ between species and could be affected by thermoregulatory requirements. We studied daily variation in TRIG and BUTY over a complete winter in Black‐capped Chickadees to determine the pattern of daily and seasonal change in these markers. We also assessed how short‐term variation (up to 7 days) in weather parameters that influence heat exchange may affect TRIG and BUTY levels. In contrast to a linear gain of body mass, TRIG increased non‐linearly during the day, with a rapid increase in the morning that levelled off in the afternoon, whereas BUTY did not change significantly. Metabolites varied with sampling time and the seasonal change in day length, suggesting higher fat catabolism and fattening rates in mid‐winter. TRIG and BUTY also differed between capture sites, possibly due to differences in shelter quality. Weather variation did not affect TRIG levels and had a significant but marginal effect on BUTY, explaining at best 3% of the variation. Our results suggest that these markers can be used as indicators of energy turnover in resident wintering passerines.

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Neuropeptide Y and orexin immunoreactivity in the sparrow brain coincide with seasonal changes in energy balance and steroids

Fokidis

Radin

et al. 2018

J of Comparative Neurology

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The transition between the breeding and nonbreeding states is often marked by a shift in energy balance. Despite this well-known shift in energy balance, little work has explored seasonal differences in the orexigenic neuropeptides that regulate food intake in wild animals. Here we tested the hypothesis that free-living male song sparrows (Melospiza melodia) show seasonal changes in energetic state, circulating steroids, and both neuropeptide Y (NPY) and orexin (OX) immunoreactivity. Nonbreeding song sparrows had more fat and muscle, as well as a ketone and triglyceride profile suggesting a greater reliance on lipid reserves. Breeding birds had higher plasma androgens; however, nonbreeding birds did maintain androgen precursors in circulation. Nonbreeding birds had more NPY immunoreactivity, specifically in three brain regions: lateral septum, bed nucleus of the stria terminalis, and ventral tegmental area. Furthermore, nonbreeding birds had more OX immunoreactivity in multiple brain regions. Taken together, the data indicate that a natural shift in energy balance is associated with changes in NPY and OX in a region-specific manner.

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Dietary Effects on Prediction of Body Mass Changes in Birds by Plasma Metabolites

Cited by 22 publications

References 25 publications

The effects of dietary macronutrients on flight ability, energetics, and fuel metabolism of yellow‐rumped warblers Setophaga coronata

The effects of dietary macronutrients on flight ability, energetics, and fuel metabolism of yellow‐rumped warblers Setophaga coronata

Daily variation in markers of nutritional condition in wintering Black‐capped Chickadees Poecile atricapillus

Neuropeptide Y and orexin immunoreactivity in the sparrow brain coincide with seasonal changes in energy balance and steroids

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