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

Cerasale, David J.; Guglielmo, Christopher G.

doi:10.1642/0004-8038(2006)123[836:deopob]2.0.co;2

Cited by 42 publications

(25 citation statements)

References 27 publications

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“…Six ruffs (Philomachus (Cerasale and Guglielmo, 2006), after which they were kept in an outdoor aviary in Missoula until our experiment. All sparrows were thus exposed to natural light conditions for an extended period before experiments and had completed feather molt and autumn migration before entering the short-day photoperiod conditioning.…”

Section: Materials and Methods Animalsmentioning

confidence: 99%

Selective mobilization of fatty acids from adipose tissue in migratory birds

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Krokfors

Guglielmo

2008

Journal of Experimental Biology

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SUMMARYDuring times of high energy demand, stored fatty acids are mobilized from adipocytes. This mobilization has previously been shown to be a non-random process, with more hydrophilic fatty acids being mobilized most readily. The objectives of this study were to characterize the relative mobilization of fatty acids from adipocytes in two migratory bird species and to investigate possible changes in selective fatty acid mobilization associated with the migratory period. Captive ruffs (Philomachus pugnax) and white-crowned sparrows (Zonotrichia leucophrys) were studied. The sparrows were divided into two treatments: ʻwinterʼ (photoperiod 8·h:16·h L:D) and ʻmigrantʼ (in which migratory condition was induced with a photoperiodic manipulation of 8·h:16·h L:D, followed by 16·h:8·h L:D). Adipose tissue was removed from ruffs and sparrows and incubated for 90·min after stimulation with epinephrine. The proportions of individual fatty acid species released into the incubation medium were compared with their proportions in the adipocytes to determine relative mobilizations. We found that patterns of relative mobilization in ruffs and sparrows are similar to those of mammals, with shorter chain lengths and more double bonds leading to higher relative mobilization. Seasonal condition in sparrows did not alter this pattern. This pattern of relative mobilization from adipocytes seems to be a general rule amongst birds and mammals and should be considered before inferring functionality about selective retention or mobilization of certain fatty acids. The composition of adipose stores in birds may affect migratory performance; however, our results indicate that patterns of relative mobilization at the adipocytes do not vary with season in migratory birds.

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Section: Materials and Methods Animalsmentioning

confidence: 99%

Selective mobilization of fatty acids from adipose tissue in migratory birds

Price

Krokfors

Guglielmo

2008

Journal of Experimental Biology

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“…However, it has also been shown in Barn Swallows Hirundo rustica that circulating immunoglobulin concentrations drop to prelaying levels with clutch completion (Saino et al 2001). Plasma triglyceride concentrations depend strongly on food intake (Jenni-Eiermann & Jenni 1997, Cerasale & Guglielmo 2006), therefore higher triglyceride concentration during incubation may indicate females' superior nutritional status compared to that during chick rearing phase. This is in accordance with higher body mass observed during incubation compared to chick rearing period.…”

Section: Incubationmentioning

confidence: 99%

Physiological Condition of Incubating and Brood Rearing Female Great TitsParus majorin Two Contrasting Habitats

Kilgas¹,

Tilgar²,

Mägi³

et al. 2007

Acta Ornithologica

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“…Plasma metabolites may provide a means of overcoming these problems, because they can be used to estimate individual rates of body-mass change in free-living birds from a single blood sample (Jenni-Eiermann and Jenni 1994, Jenni and Schwilch 2001, Schaub and Jenni 2001, Guglielmo et al 2002, Seaman et al 2005, Cerasale and Guglielmo 2006a, Smith et al 2007. In these studies, body-mass change was best estimated from levels of triglyceride (indicator of fat deposition),…”

Section: Introductionmentioning

confidence: 99%

“…So far, plasma-metabolite concentrations have been used to predict body-mass changes over intervals of hours or one to two days in small passerines and shorebirds (Jenni-Eiermann and Jenni 1994, Williams et al 1999, Cerasale and Guglielmo 2006a. Only Williams et al (1999), in the Western Sandpiper (Calidris mauri), used longer intervals (7 days) and showed that at this scale relationships were less consistent (glycerol) and even nonexistent (triglyceride and -hydroxybutyrate) than at the shorter intervals (1-2 days).…”

Section: Introductionmentioning

confidence: 99%

“…Only Williams et al (1999), in the Western Sandpiper (Calidris mauri), used longer intervals (7 days) and showed that at this scale relationships were less consistent (glycerol) and even nonexistent (triglyceride and -hydroxybutyrate) than at the shorter intervals (1-2 days). Because short-term fasting affects metabolite levels, research has also been limited to situations where blood samples can be taken within a few minutes after the bird's capture (Jenni-Eiermann and Jenni 1994, Williams et al 1999, Cerasale and Guglielmo 2006a.…”

Section: Introductionmentioning

confidence: 99%

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The Use of Plasma Metabolites to Predict Weekly Body-Mass Change in Red Knots

Dietz

Jenni-Eiermann

Piersma

2009

Condor

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Resumen. Los individuos de la especie Calidris canutus migran largas distancias, se reproducen en la tundra a altas latitudes en el Ártico e invernan a lo largo de las costas templadas y tropicales. La tasa de abastecimiento antes del vuelo es la principal determinante del éxito de migración. Sin embargo, estas tasas de abastecimiento son imposibles de determinar debido a que los individuos de C. canutus no son recapturados con facilidad. Estos problemas pueden ser minimizados con la estimación de los cambios en el peso corporal a partir de metabolitos plasmáticos. Estos metabolitos plasmáticos, sin embargo, son sensibles al estrés y al tiempo desde la última comida, lo que limita los estudios a aquellas situaciones en las que las muestras de sangre pueden ser tomadas inmediatamente después de la captura. Este tipo de muestreos en el campo son casi imposibles, debido a que los individuos de C. canututs son capturados generalmente con redes de neblina durante la noche. Este estudio con individuos en cautiverio de C. canututs investigó si los metabolitos plasmáticos obtenidos de muestras de sangre tomadas hasta 3 horas después de la captura pueden ser usados para predecir los cambios en el largo plazo (semanales) del peso corporal de los individuos durante el periodo natural de abastecimiento de primavera, que ocurre antes del vuelo. Los triglicéridos disminuyeron y el -hidroxibutirato aumentó con el tiempo desde la captura, y estos cambios variaron con el inicio del periodo de engorde de primavera. El -hidroxibutirato y el ácido úrico se correlacionaron con los cambios semanales en el peso corporal, pero los triglicéridos no. Los triglicéridos se correlacionaron con el peso corporal general. La mejor forma de predecir el cambio semanal en el peso corporal fue con un modelo que incluyó todos los metabolitos y el peso corporal. El tiempo de colecta de la muestra de sangre (inmediatamente o 3 horas después de la captura) no afectó la precisión de las predicciones. Las predicciones no fueron lo suficientemente precisas para permitir la comparación entre individuos; estas deberán usarse sólo para comparar grupos de individuos. THE USE OF PLASMA METABOLITES TO PREDICT WEEKLY BODY-MASS CHANGE IN RED KNOTS Uso de Metabolitos Plasmáticos para Predecir Cambios Semanales del Peso Corporal en Calidris canutusAbstract. The Red Knot (Calidris canutus) is a long-distance migrant breeding on tundra in the high Arctic and wintering along temperate and tropical coasts. Preflight fueling rate is a major determinant of successful migration, yet individual fueling rates are impossible to determine because Red Knots cannot be recaptured easily. These problems can be overcome by estimating changes in body mass from plasma metabolites. Plasma metabolites are, however, sensitive to stress and time since last meal, limiting studies to situations where birds can be bled almost immediately after capture. Such sampling is almost impossible in the field, where Red Knots are often captured with mist nets in darkness. This study on captive Red ...

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

Cited by 42 publications

References 27 publications

Selective mobilization of fatty acids from adipose tissue in migratory birds

Selective mobilization of fatty acids from adipose tissue in migratory birds

Physiological Condition of Incubating and Brood Rearing Female Great TitsParus majorin Two Contrasting Habitats

The Use of Plasma Metabolites to Predict Weekly Body-Mass Change in Red Knots

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