Comparison between the concentrations of nitrogenous waste products in ureteral urine and in excreta, of yellow-vented bulbuls and Tristram's grackles
| . | Concentration of waste product (mg ml−1) . | . | . | . | |||
|---|---|---|---|---|---|---|---|
| . | Urate* . | Ammonia* . | Soluble proteins* . | Urea* . | |||
| Bulbul | |||||||
| Excreta | 0.44±0.07 | 0.17±0.02 | 0.12±0.02 | 0.03±0.01 | |||
| Ureteral urine | 1.14±0.1 | 0.36±0.1 | 0.32±0.06 | 0.15±0.06 | |||
| Paired t | 7.8 | 2.0 | 2.7 | 2.2 | |||
| d.f. | 13 | 13 | 10 | 3 | |||
| P | >0.0001 | 0.07 | 0.02 | 0.1 | |||
| Grackle | |||||||
| Excreta | 1.32±0.17 | 0.22±0.03 | 0.14±0.02 | 0.03±0.01 | |||
| Ureteral urine | 1.27±0.14 | 0.36±0.05 | 0.63±0.13 | 0.12±0.03 | |||
| Paired t | 0.2 | 3.32 | 3.8 | 3.3 | |||
| d.f. | 16 | 17 | 16 | 16 | |||
| P | 0.6 | 0.004 | 0.002 | 0.004 | |||
| . | Concentration of waste product (mg ml−1) . | . | . | . | |||
|---|---|---|---|---|---|---|---|
| . | Urate* . | Ammonia* . | Soluble proteins* . | Urea* . | |||
| Bulbul | |||||||
| Excreta | 0.44±0.07 | 0.17±0.02 | 0.12±0.02 | 0.03±0.01 | |||
| Ureteral urine | 1.14±0.1 | 0.36±0.1 | 0.32±0.06 | 0.15±0.06 | |||
| Paired t | 7.8 | 2.0 | 2.7 | 2.2 | |||
| d.f. | 13 | 13 | 10 | 3 | |||
| P | >0.0001 | 0.07 | 0.02 | 0.1 | |||
| Grackle | |||||||
| Excreta | 1.32±0.17 | 0.22±0.03 | 0.14±0.02 | 0.03±0.01 | |||
| Ureteral urine | 1.27±0.14 | 0.36±0.05 | 0.63±0.13 | 0.12±0.03 | |||
| Paired t | 0.2 | 3.32 | 3.8 | 3.3 | |||
| d.f. | 16 | 17 | 16 | 16 | |||
| P | 0.6 | 0.004 | 0.002 | 0.004 | |||
The concentration of urate and ammonia can be transformed to the concentration of nitrogen excreted as urate and ammonia (in mg N ml−1) by multiplying the numbers in this table by 0.334 and 0.823, respectively.
Values are means ± s.e.m.