21 research outputs found
Energy metabolism and body temperature in the Blue-naped Mousebird (Urocolius macrourus) during torpor
No full textMousebirds (Coliiformes) respond to cold exposure and food limitation with nightly bouts of torpor . During torpor, metabolic rate and body temperature decrease markedly, which results in energy savings. The decrease in body temperature is a regulated phenomenon as is also the arousal which occurs spontaneously without external stimuli. During arousal, Blue-naped Mousebirds warm at a rate of 1 °C/min . This process requires significant amounts of energy . Our calculations show that the overall savings for the whole day are 30% at an ambient temperature of 15°C when daylength is 10 hours . Using glucose assays and RQ measurements, we found that during fasting, the birds switch to non-carbohydrate metabolism at an early phase of the day . This may be one of triggers eliciting torpor. By using cluster analysis of glucose levels we could clearly divide the night phase into a period of effective energy saving (high glucose levels) and arousal (low glucose levels)
GROWTH, THE DEVELOPMENT OF ENDOTHERMY, AND TORPIDITY IN BLUE-NAPED MOUSEBIRDS <i>UROCOLIUS MACROURUS</i>
No full text
Comparative heart mass in Blue-naped Mousebirds (<i>Urocolius macrourus</i>) and Speckled Mousebirds (<i>Colius striatus</i>)
No full textEmbryological Development of Oxygen Consumption and Egg Parameters in the Semi-altricial Australian Diamond Dove, Geopelia cuneata
No full textDiamond dove eggs show characteristics typical of semi-altricial birds. All egg parameters that we examined were within the expected range for semi-altricial birds: only the relative portion of lipid content (7.9% of egg mass) was different from (25% higher) the mean value for comparable-sized eggs of semialtricial birds. The embryonic development of oxygen consumption shows a clear plateau phase with values within the expected range for semi-altricial species. The plateau occurs at 83.0 ± 6.0% of incubation, and is about 1 day in duration; the oxygen consumption per egg is 42.2 ± 3.14 mL per day and 0.80 ± 0.06 mL per g per h, respectively
Short NoteComparative heart mass in Blue-naped Mousebirds (Urocolius macrourus) and Speckled Mousebirds (Colius striatus)
No full text(Ostrich: 2003 74(1&2): 139-140
