l. Nutritional balances for calories, glucose, water, nitrogen, Na+, K+, Ca2+, and Mg2+ have been estimated for free-flying cedar waxwings feeding on Washington hawthorn fruits.2. Birds assimilate 39.9 calories/fruit ( = 20.0% of available calories) and a net loss of 155 mg of water/fruit.3. Reducing sugars account for 74.5% of assimilated calories ( = 66.0% assimilation efhciency). 4. While feeding on these fruits, birds exhibit positive nitrogen and caloric balance, and negative Na+, K+, Mg2+, Ca2+, and water balances.
Nestling eastern bluebirds experience a drop in live mass after 13 days of age; however, dry mass continues to increase. 2. Caloric density and body concentrations of Fe, Mg, and Na remain constant, Ca and N concentrations increase, and K concentration decreases with nestling age. Daily nutrient accretions in nestling eastern bluebirds are much less than in non-passerines. 3. Quantities of select insects fed to nestlings (to meet daily caloric requirements) do not satisfy certain elemental accretion requirements. 4. Fecal sac Ca levels indicate that nestlings scarcely receive a sufficient quantity of Ca to meet minimal growth requirements.
l. Oxygen consumption of green Spongilla lacustris in the light is lower than that in the dark.2. The relationship between oxygen consumption (OC in ~1 O,/mg dry wt/hr) and hours of continuous lieht (HLI is: OC = 1.207 -0.0143 (HL)'.
For light durationsgreater than 9 hr. symbiotic zoochlorellae produce photosynthetically derived oxygen in excess of the needs of the symbiotic complex.
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