Test, rejection, and reformulation of a chemical reactor-based model of gut function in a fruit-eating bird.

摘要: Abstract We explored modulation of retention time in cedar waxwings (Bombycilla cedrorum) by feeding them diets varying hexose concentration. Our goals were to (1) test three predictions a chemical reactor–based model how guts might respond optimally diet shifts; (2) determine whether can occur quickly, thereby facilitating rapid changes diet; (3) tease apart the relative influence ingestion rate and nutrient concentration on time; (4) examine degree axial mixing intestine its relationship with time. The model's rejected: mean did not decrease, increase, glucose assimilation efficiency decrease increased diet. Instead, birds displayed maximal intake at intermediate sugar concentration, mouth cloaca times Significant occurred qui...