..., we assumed that using the assayed nitrogen underestimates nitrogen requirements only slightly. In both species, a significant positive correlation was found between nitrogen balance and nitrogen intake ( Fig. 2 ). The estimated MNR and TENL for both species on the first and third days...

... nitrogen balance energy balance food quality arthropod consumption hummingbird green-backed firecrown Sephanoides sephaniodes Chile Floral nectars exploited by hummingbirds are rich in water and carbohydrates, but contain only traces of amino acids, minerals and vitamins( Baker and Baker...