Michael J. Adams and Christopher A. Pearl, Unpublished Material, Willamette Valley Wetland Amphibian Survey 1999, 2000, 2001.
| Value | Definition |
|---|---|
| clear | clear |
| stained | stained |
| Range of values | |
|---|---|
| Minimum: | 10 |
| Maximum: | 1100 |
| Units: | microsiemens |
Date format (mm/dd/yyyy)
| Value | Definition |
|---|---|
| conn-perm | permanently connected |
| Conn-temp | temporally connected |
| conn-flood | connected only during a flood event |
| landlocked | not connected |
| Value | Definition |
|---|---|
| <0.75 | <0.75 meters deep |
| 0.75-1.25 | 0.75-1.25 meters deep |
| >1.25 | 1.25 meters deep |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 100 |
| Units: | percent |
List of site names
e.g. 99-01
list of initials
Unique integer generated by database
| Value | Definition |
|---|---|
| clear | clear |
| mod | moderately clear |
| opaque | unclear |
| clear | clear |
| mod | moderately clear |
| opaque | unclear |
| Value | Definition |
|---|---|
| 1 | |
| 2 | |
| 3 | |
| 4 |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 100 |
| Units: | percent |
Unique integer generated by database
| Value | Definition |
|---|---|
| Aquatic bed, floating | |
| aquatic bed, SAV | submerged aquatic vegetation |
| Dry | |
| Emgt Phalaris | |
| Emgt Poaceae | |
| open water | |
| open water algae | |
| open water leaf litter/organic | |
| Emgt Carex/Juncus | |
| Emgt Deschampsia | |
| Emgt Eleocharis | |
| Emgt Glyceria | |
| Emgt Polygonum | |
| Emgt solanum | |
| Emgt sparganium | |
| Emgt Typha | |
| open water rock bottom | |
| open water silt bottom | |
| open water woody debris | |
| other shrub spiraea salix cornus | |
| Emgt Ludwigia | |
| Emgt Mentha | |
| Emgt Veronica | |
| flooded forest ash cottonwood |
| Range of values | |
|---|---|
| Minimum: | no limit |
| Maximum: | no limit |
| Units: | degrees Celcius |
| Resolution: | 1 |
| Value | Definition |
|---|---|
| clear | |
| cloudy | |
| partly cloudy |
filename
| Value | Definition |
|---|---|
| fog | |
| mist | |
| lgt rain | |
| hvy rain | |
| sleet/snow |
| Range of values | |
|---|---|
| Minimum: | 00:00 |
| Maximum: | 24:00 |
| Units: | hours:minutes |
Unique integer generated by database
| Value | Definition |
|---|---|
| calm | |
| lgt breeze | |
| mod | moderately windy |
| windy | |
| gusty |
| Value | Definition |
|---|---|
| Visual | |
| Call | |
| Hand/net |
number generated by computer
| Value | Definition |
|---|---|
| M | male |
| F | female |
| U | unknown |
| Value | Definition |
|---|---|
| eggmass | |
| larva | |
| juvenile | |
| adult | |
| metamorph | between egg and juvenile |
| paedomorph | between juvenile and adult |
Unique integer generated by database
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | no limit |
List of organisms
| Value | Definition |
|---|---|
| Dense | |
| Moderate | |
| Open |
| Value | Definition |
|---|---|
| Yes | |
| No |
| Range of values | |
|---|---|
| Minimum: | 00:00 |
| Maximum: | 24:00 |
| Units: | hours:minutes |
| Range of values | |
|---|---|
| Minimum: | 00:00 |
| Maximum: | 24:00 |
| Units: | hours:minutes |
| Value | Definition |
|---|---|
| <5% | <5% slope |
| >5% | 5% slope |
| Value | Definition |
|---|---|
| flc | flocculent |
| cons | consolidated |
Unique integer generated by database
number generated by computer
types of vegetation
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | no limit |
| Units: | meters |
generated by database, gives a number to organism
| Value | Definition |
|---|---|
| eggmass | |
| larva | |
| juvenile | |
| adult | |
| metamorph | between egg and juvenile |
| paedomorph | between juvenile and adult |
Unique integer generated by database
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | no limit |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | no limit |
List of organisms
| Value | Definition |
|---|---|
| M | male |
| F | female |
| U | unknown |
| Value | Definition |
|---|---|
| eggmass | |
| larva | |
| juvenile | |
| adult | |
| metamorph | between egg and juvenile |
| paedomorph | between juvenile and adult |
Unique integer value generated by database
List of organisms
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | no limit |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | no limit |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | no limit |
| Units: | none |
Unique integer value generated by database
Date format (mm/dd/yyyy)
List of initials or names
List of initials or names
| Value | Definition |
|---|---|
| Yes | |
| No |
Date format (mm/dd/yyyy)
| Value | Definition |
|---|---|
| Yes | |
| No |
Unique integer generated by database
541-758-8857 (voice)
541-758-7761 (FAX)
Wetland management and land use planning have important consequences for the persistence of wetland-associated fauna. Wetland hydrology, particularly the persistence of surface water through the year, affects nutrient levels, soil hdyrogeomorphology (HGM), and the numbers and types of organisms that form a wetland community. There is a critical need for landscape-scale analyses of wetland biodiversity in the rapidly changing Willamette Valley and Puget Lowlands. Research in other regions suggest that land use trends that result in habitat loss, hydrological alterations, and changes in connectivity have negative impacts on aquatic fauna such as amphibians . In addition to direct habitat loss, there is a general trend of replacement of shallow, ephemeral wetlands with deep, permanent ponds that may encourage the expansion of exotic species that rely on permanent water . Altered hydrology and invasion by exotics are considered by many aquatic ecologists to be the two greatest threats to the freshwater fauna of western North America. This research addresses the properties of freshwater wetlands that are important to native amphibian communities and the role that exotic predators play in those communities, specifically as they apply to wetland management and conservation practices. By identifying physical characteristics of wetlands that are affected by regional patterns in land use and management, and by elucidating the processes that link these patterns to wetland faunal communities, we can better predict the regional faunal response to increasing anthropogenic impacts.
We surveyed approximately 15 wetlands in the Eugene-Corvallis area during the first year, 1999. During 2000 and 2001, site selections were opportunistic. As much as possible, wetlands surveyed were evenly divided between managed and naturally occurring wetlands (wetlands that existed in their present type without human interference) and between urban and rural landscapes. We identified created and naturally occurring wetland study areas at E. E. Wilson Wildlife Area (Oregon Department of Fish and Wildlife), W. L. Finley National Wildlife Refuge (US Fish and Wildlife Service), Fern Ridge Reservoir (US Army Corps of Engineers) Nature Conservancy holdings, and on private land.
Each selected wetland was surveyed twice (early and late spring) within the funding interval so that faunal elements that change throughout the year were adequately characterized. Wetland fauna were sampled each visit and physical characteristics were quantified during the second visit. Amphibians, fish, and crayfish were sampled with aquatic funnel traps. Traps are 30-cm square by 40-cm long and have 4-mm mesh. They are suitable for capturing the larvae of all wetland-breeding amphibians in the Willamette Valley. Wetlands were divided into sections based on major differences in vegetation and structure, and traps were allocated in proportion to the size of each section using the protocol of Adams et al. (1997).
Traps were placed on the bottom of the wetland, marked with an attached float and left overnight. Size, species, stage, and number of all amphibians, invertebrates, and fish captured were recorded. All amphibians and fish, and some aquatic insects and crustaceans were identified to species.
After pulling the traps the following morning, each wetland section was surveyed for invertebrates using dip nets. Dip nets were swept through the water over a 2-meter distance, five times in each wetland section. Size, number, and species/family of large predatory macroinvertebrates were recorded.
We coordinated this survey with the development of land-use spatial data layers for the Willamette Valley by the Landscape Team (Regional Ecology Branch, EPA) and used these data layers to assess the association between wetland communities and landscape variables
Reference:
Data were read aloud by one person, while another person entered data into Access. The data were coarsely proofed at this time by both workers. At a later date, the data were then check for accuracy by comparing data base entries to the data sheets. All entries were proofed. In addition, a random number of sites came up for a quality assurance process and they were again checked for accuracy by comparing the data sheets with the database.
See Methodology
Each database row represents a field observation on the date and at the location specified in the data set.
Are there legal restrictions on access or use of the data?
- Access_Constraints: Data available after research results have been published.
- Use_Constraints: No probabilistic sampling occurred, no range of inference.
541-750-7343 (voice)
541-758-7761 (FAX)
george_lienkaemper@usgs.gov