Data Set Citation
NCEAS 5920: Pyke: Understanding environmental variability in human-dominated landscape, National Center for Ecological Analysis and Synthesis, and Pyke C.Vernal Pool Hydroregime Surfaces for the Central Valley of California.
bowdish.271.3 (http://knb.ecoinformatics.org/knb/metacat/bowdish.271.3/nceas).
Data Tables, Images, and Other Entities:
Metadata download:Ecological Metadata Language (EML) File
Data Table:v2valley.zip (View Metadata | Download File download)
Data Table:v4valley.zip (View Metadata | Download File download)
Data Table:v6valley.zip (View Metadata | Download File download)
Data Table:v9valley.zip (View Metadata | Download File download)
Data Table:v2p.zip (View Metadata | Download File download)
Data Table:v4p.zip (View Metadata | Download File download)
Data Table:v6p.zip (View Metadata | Download File download)
Data Table:v9p.zip (View Metadata | Download File download)
Data Table:v10p.zip (View Metadata | Download File download)
Data Table:v10valley.zip (View Metadata | Download File download)
Data Set Owner(s):
Organization:NCEAS 5920: Pyke: Understanding environmental variability in human-dominated landscape
Organization:National Center for Ecological Analysis and Synthesis
Individual: Chris Pyke
Email Address:
pyke.chris@epa.gov
Abstract:
 
Vernal pools are ephemeral wetlands formed in small, topographic depressions throughout the Central Valley of California. Ecological processes in these wetlands are dominated by their hydrologic conditions, collectively described as their hydrologic regime. This includes the timing and duration of flooding and patterns of inter-annual variability (e.g., fraction of years with flooding suitable for reproduction of a certain species of concern). This dataset provides a preliminary look at geographic patterns in seven important hydroregime variables.
Keywords:
 
  • Vernal Pool
  • Surface Water
  • Wetlands
  • Inundation
  • Central Valley of California
  • Hydropattern
Additional Information:
 
This data set was part of a dissertation: Pyke, C.R. 2002. The hydrologic regime of rain-fed vernal pools in California: mechanisms, ecoregional distribution, and the impact of climate and land-use change. Ph.D. dissertation. Department of Geography, University of California, Santa Barbara. Literature cited Holland, R. F. 1998. Great Valley vernal pool distribution, photorevised 1996. Pages 71-75 in C. Williams, E. Bauder, D. Belk, W. Ferren Jr., and R. Ornuff, editors. Ecology, conservation, and management of vernal pool ecosystems -- Proceedings from a 1996 conference. California Native Plants Society, Sacramento, California. Pyke, C. R. 2002. Modeling vernal pool hydrologic regime over space and time. Ph.D. University of California, Santa Barbara.
Geographic Coverage:
Geographic Description:Central Valley of California
Bounding Coordinates:
West:  -122.506  degrees
East:  -119.25  degrees
North:  40.303  degrees
South:  34.844  degrees
Access Control:
Auth System:knb
Order:denyFirst
Access Rules:
ALLOW:
[read]
public
ALLOW:
[read]
uid=nceasadmin,o=NCEAS,dc=ecoinformatics,dc=org
Contact:
Individual: Chris Pyke
Email Address:
pyke.chris@epa.gov
Methods Info:
Step 1:  
Description:
Methods used
Introduction and Limits of Use
The surfaces were generated in a three step process: (1) estimation of hydroregime variables for 34 point locations (weather stations) across the Central Valley using the PHYDO hydroregime model, (2) fitting regression models to these stations, (3) applying the regression models to capture large-scale trends, (4) estimating residuals for each station, (5) interpolating residuals across the Valley to capture fine-scale variation and restore exact modeled values at each station, and (6) add the regression models and the interpolated residuals to create final raster surfaces (see Pyke (2002) for a detailed discussion of methods). In some cases these surfaces were cleaned with conditional operators to pick off outlying values that sometimes occur along the edges of the Valley. The most typical operation removed flood durations greater than 365 or less than 0 and replaced them with 0 values. These filters were not applied at all to the"pools-only" surfaces.
Instrument(s): The development of the PHYDO model balanced detailed descriptions of individual pools against a desire to understand populations of pools in different landscapes. PHYDO primarily seeks to describe the aggregate behavior of populations of pools under given climate regime. PHYDO's secondary application is to simulate the dynamics of any specific pool. For local applications,PHYDO is best used in tandem with observational data to validate and, if necessary, adjust the model to specific conditions. The raster data available in these files is best used for relative comparisons between sites (i.e., this site is wetter or drier than another site) and assessments at the ecoregional scale.
Sampling Area And Frequency:
34 point locations (weather stations) across the Central Valley using the PHYDO hydroregime model
Sampling Description:
The raster data available in these files is best used for relative comparisons between sites (i.e., this site is wetter or drier than another site) and assessments at the ecoregional scale. The surfaces available in this distribution reflect only the average hydroregime responses for 100 pools in each location, and although the distribution around each average (i.e., the range of conditions modeled for the entire set of 100 pools) is known, this data is not included with these data surfaces at this time.