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Do Birds Drink?. Evaporative Water Loss versus Body Mass. Fig. 6-24 in Gill 2008. Evaporative Cooling. H 2 0 (liquid). + Energy. H 2 0 (gas). California Towhee. 40 o F. 30 o F. Water Loss Quadruples. Obtaining Water: Direct Uptake. Obtaining Water: Fleshy Food.
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Evaporative Water Loss versus Body Mass Fig. 6-24 in Gill 2008
Evaporative Cooling H20 (liquid) + Energy H20 (gas) California Towhee 40o F 30o F Water Loss Quadruples
Obtaining Water: Metabolic Water O2 CO2 H20 + +
Obtaining Water: Metabolic Water Eastern Phoebe Rock Wren Zebra Finch
EXCRETION &$@%&
Bird Droppings (= Feces + Uric Acid) Fig. 4-105 in Podulka et al. 2004
NITROGENOUS WASTE • Amino Acid • Metabolism 2) Nitrogen Base Metabolism Pyrimidines Purines Urea Uric Acid Uric Acid
Protein Digestion: Proteases I) Pepsin Trypsin Chymotrysin II)
Amino Acid Use: Biosynthesis 1) Protein Synthesis 3) Nitric Oxide (NO) 3) Melanin
Amino Acid Use: Entry into Metabolic Pathways Pyruvate Acetyl-CoA Kreb Cycle
Amino Acid Use: Entry into Metabolic Pathways + 1) H+ Carbon Shell (Enters Respiratory Pathway) NH4+ + Urea (Mammals) 2) NH4+ Uric Acid (Birds)
Nucleotides Mononucleotides Dinucleotides Trinucleotides
Nitrogen Base Metabolism: Nitrogen Bases Urea (Highly Soluble) Uric Acid (Low Solubility)
Nitrogenous Waste UREA (Mammals) URIC ACID (Birds) • Simple Molecule • Less Expensive to • Synthesize • Less Nitrogen per Molecule • Very Water Soluble • Complex Molecule • Expensive to Synthesize • More Nitrogen per Molecule • Low Water Solubility
Excretory System: Kidneys, Ureters • Water Resorbed to Level Just Above Precipitation Level • of Uric Acid
Excretory System: Kidneys,Ureters, Cloaca (Bladder?) Rhea Fig. 4-106 in Podulka et al. 2004
Excretory System: Cloaca • Very Little Water needs to be Resorbed by Cloaca • to Precipitate Uric Acid (Energy Intensive Process)
URINARY SYSTEM: SUMMARY Fig. 107 in Podulka et al. 2004
Avian Water Conservation: An Exception Water Excretion up to 3.5 Times Body Mass
Regulating Salt Intake Sooty Shearwater Albatross Storm Petrel
Salt Glands • Infoldings of Lining of Nares, with Packed Secretory Tubules • Arteries of the Tubules Extract Salt • Tubules Drain out a Central Duct and down Grooves of Bill
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