Water-vapor pressure in nests of the San Miguel Island Song Sparrow
The Condor
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Abstract
The water-vapor pressure (PN) in nests of the San Miguel Island race of Song Sparrows (Melospiza melodia micronyx) averaged 16 torr, but varied considerable between nests and within individual nests during successive days of incubation. Large daily fluctuations occurred throughout the incubation period and did not parallel concurrent changes in ambien vapor pressure (P1). Daily rates of water loss from nest eggs (MH2O) averaged 28 mg day-1, but also varied considerable within and between nests and did not correlate with changes in P1. MH2O increased 6-33% after the third day of incubation. PN was significantly higher and MH2O significantly lower in nests located in sheltered gullies than in nests from a windswept slope. These data suggest that Song Sparrows do not regulate PN to achieve hatching success.
Suggested Citation
Kern, M.D., Sogge, M.K., and van Riper, C., 1990, Water-vapor pressure in nests of the San Miguel Island Song Sparrow: The Condor, v. 92, no. 3, p. 761-767, https://doi.org/10.2307/1368696.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Water-vapor pressure in nests of the San Miguel Island Song Sparrow |
| Series title | The Condor |
| DOI | 10.2307/1368696 |
| Volume | 92 |
| Issue | 3 |
| Year Published | 1990 |
| Language | English |
| Publisher | Cooper Ornithological Club |
| Publisher location | Santa Clara, CA |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | The Condor |
| First page | 761 |
| Last page | 767 |
| Country | United States |
| State | California |
| Other Geospatial | San Miguel Island |