Skip to Main Content
Weather-related effects on woodland vernal pool hydrology and hydroperiodAuthor(s): Robert T. Brooks
Source: Wetlands. 24(1): 104-114.
Publication Series: Miscellaneous Publication
Station: Northeastern Research Station
PDF: Download Publication (1.33 MB)
DescriptionWoodland vernal pools occur commonly throughout northeastern North America. These pools provide preferred breeding habitat for mole salamanders (Ambystoma spp.) and wood frogs (Rana sylvatica) and support an abundant and diverse macroinvertebrate fauna. Vernal pool hydrology, and especially hydro-period or duration of the wet phase, affects the composition and productivity of pool fauna. The hydrology of ephemeral wetlands is dominated by local weather conditions. In this paper, I report a ten-year record of the relationships between precipitation and evapotranspiration and water-level change and hydroperiod in four typical southern New England vernal pools. Long-term average precipitation is evenly distributed throughout the year in the Northeast; potential evapotranspiration peaks in the summer months and exceeds precipitation from mid-June through mid-September. This period of water deficit causes the period of maximum vernal pool drying. Vernal pool hydroperiods were shorter and pools dried earlier in those years with larger cumulative water deficits, especially when early spring ground-water resources were below long-term means and late winter snowpack was reduced or absent. Weekly water-level change in vernal pools was significantly related to precipitation and potential evapotranspiration, with precipitation having 2-5 times greater effect than evapotranspiration. Under climate-change predictions of more episodic precipitation and increased evapotranspiration, vernal pools would dry earlier in the year and remain dry longer. These changes would adversely affect the successful reproduction of pool-breeding amphibians and isolate the remaining productive pools.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
CitationBrooks, Robert T. 2004. Weather-related effects on woodland vernal pool hydrology and hydroperiod. Wetlands. 24(1): 104-114.
Keywordshydrology, hydroperiod, potential evapotranspiration, precipitation, vernal pools, woodland vernal pools
- A review of basin morphology and pool hydrology of isolated ponded wetlands: implications for seasonal forest pools of the northeastern United States
- Depth-area-volume and hydroperiod relationships of ephemeral (vernal) forest pools in southern New England
- Herpetofaunal species composition and relative abundance among three New England forest types
XML: View XML