Transport characteristics and morphology of the colon and coprodeum in two wild birds of different habitats, the rock ptarmigan (Lagopus mutus) and the common murre (Uria aalge).

摘要: Abstract Dietary salt intake in domestic fowl affects epithelial transport and morphology of the lower intestine (colon coprodeum). This study investigated intestinal activity two wild bird species with natural diets containing either low or high salt. Tissues from rock ptarmigan (Lagopus mutus) common murres (Uria aalge) were sampled for histology electrophysiological analyses. The exists on a diet, while murre lives protein diet. colon coprodeum had villi/folds crypts epithelium contained absorptive cells, mitochondria-rich cells goblet cells. significant amiloride-inhibitable Isc, 5-15 μA/cm2, no glucose-stimulated phloridzin inhibition. also Isc. pattern corresponded to that chickens low-salt diets. However, lysine/leucine-stimulated Isc 3 ± 1.0 μA/cm2. short U. aalge was similar ptarmigans, but villi. It demonstrated (11 ± 3.5 μA/cm2) high-salt chicken colon, Na+-glucose cotransport. inert all substances showed resistance (1000 Ω·cm2), multilayered squamous epithelium. Despite some variations possibly associated dietary intake, we conclude different avian are patterns, providing post-renal adjustments ion water excretion.