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The relationship between uric acid and its oxidative product allantoin: a potential indicator for the evaluation of oxidative stress in birds
TLDR
It is demonstrated that allantoin is present in the plasma and in the ureteral urine of white-crowned sparrows and therefore might be useful as an indicator of oxidative stress in birds. Expand
Can birds be ammonotelic? Nitrogen balance and excretion in two frugivores
TLDR
Two non-exclusive mechanisms for the post-renal modification of urine in these birds are suggested: bacterial catabolism of uric acid and reabsorption of Uric acid in the hindgut and birds might benefit from its re absorption. Expand
Distribution and Extinction of Ungulates during the Holocene of the Southern Levant
TLDR
A negative relationship was found between the average body mass of ungulate species that became extinct during the Holocene and their extinction date, suggesting that the intensified human activity through habitat destruction and uncontrolled hunting were responsible for the two major waves ofUngulate extinction in the southern Levant during the late Holocene. Expand
Hummingbirds arrest their kidneys at night: diel variation in glomerular filtration rate in Selasphorus platycercus
TLDR
Although hummingbirds and other nectarivorous birds can consume astounding amounts of water, a phylogenetically explicit allometric analysis revealed that their diurnal GFRs are not different from the expectation based on body mass. Expand
Impact on fruit removal and seed predation of a secondary metabolite, emodin, in Rhamnus alaternus fruit pulp
TLDR
It is suggested that emodin has an ecological role, preventing seed predation by invertebrates and microbes without decreasing fruit removal by avian dispersers. Expand
Dietary protein influences the rate of 15N incorporation in blood cells and plasma of Yellow-vented bulbuls (Pycnonotus xanthopygos)
TLDR
Using model comparison analyses, it is found that one-compartment models described incorporation data better than two-compartments models, and isotopic incorporation rates and tissue-to-diet discrimination factors cannot be considered fixed, as they depend on diet composition. Expand
Are the Low Protein Requirements of Nectarivorous Birds the Consequence of Their Sugary and Watery Diet? A Test with an Omnivore
TLDR
The measurements of minimal nitrogen requirements and total endogenous nitrogen loss in the omnivorous European starling Sturnus vulgaris suggest that the low measured nitrogen requirements of nectar‐feeding birds are not simply the result of their sugary and watery diets but a physiological adaptation to the low nitrogen input. Expand
DO NECTAR- AND FRUIT-EATING BIRDS HAVE LOWER NITROGEN REQUIREMENTS THAN OMNIVORES? AN ALLOMETRIC TEST
TLDR
The residuals of the allometric relationships between TENL and MNR and body mass were positively correlated, which suggests that a large proportion of the interspecific variation in MNR is explained by variation in TENl. Expand
Within population variation and interrelationships between morphology, nutritional content, and secondary compounds of Rhamnus alaternus fruits.
TLDR
Primary metabolite (emodin) concentration was positively correlated with concentrations of NSC, supporting the nutrient/toxin titration model, which predicts that high levels of secondary metabolites in fruits should be off set by high nutritional rewards for dispersers. Expand
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