The validity of the haematocrit or packed cell volume as an indicator of condition in wild
birds has recently been questioned. We reviewed over 300 published papers on …

Avian basal metabolic rate (BMR) and summit metabolic rate (M sum) vary in parallel during
cold acclimation and acclimatization, which implies a functional link between these …

Nutrition during the time spent at the nest is critical for the development of the body condition
in altricial birds, including nestling blue tits (Cyanistes caeruleus). Trophic conditions tend to …

Several studies have previously proposed that blood hemoglobin concentration in nestling
passerines is a reliable index of individual condition and nutritional state. In this paper we …

Recent experiments on shorebirds have demonstrated that maintaining an active
osmoregulatory machinery is energetically expensive. This may, in part, explain diet and …

We investigated the intraspecific variation in basal metabolic rate (BMR) and total
evaporative water loss (TEWL) in the omnivorous passerine Zonotrichia capensis from two …

We report results obtained using a new technique developed to measure the stable‐isotope
composition of uric acid isolated from bird excreta (guano). Results from a diet‐switch …

Predictions indicate that birds worldwide will be affected by global warming and extreme
climatic events which is especially relevant for passerines because the diurnal habits, small …

We investigated the phenotypic plasticity of renal function in three South American coastal
passerine Cinclodes (ovenbirds) differing in the proportion of marine prey they consume …

The urine field osmolality in Zonotrichia capensis along a latitudinal gradient in rainfall and
temperature in Chile was examined. We also investigated latitudinal variation in the renal …