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Data Release Seasonal median daily water depths for study wetlands in the St. Croix National Scenic Riverway, the North Temperate Lakes Long-term Research area, and the Upper Mississippi River study area from 2013-2018
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Authors: Sadinski Walt, Roth F Mark | Date: 2020-05-20 | Outlet: U.S. Geological Survey data release, https://doi.org/10.5066/P9H4VLEM | Format: .XLSX
To relate water levels in our study wetlands to temperature, precipitation, wetland water depth, and amphibian calling activity, we installed one pressure logger in the deepest spot we could find in each wetland. Soon after thawing conditions allowed, we drove a plastic pipe (anchor pipe) into the sediments at the deepest location and secured another pipe to it that contained one pressure logger (Onset Computer Corporation Model U20-001-04 [Bourne, MA, USA]) suspended approximately 2.5 cm above the sediments. We installed additional individual pressure loggers in the upper part of the logger pipes (in air) at select locations to measure barometric pressure for calibrating the submerged loggers’ readings. We measured pressure once per hour and used software supplied by the logger manufacturers to upload and convert data to depth at the end of each season.
Beaver dam, Oregon.
Beaver dam, Oregon.
Brome McCreary
Data Release Oregon spotted frog (Rana pretiosa) monitoring data for metademographic analysis 2010-2018, Oregon: U.S. Geological Survey Data Release
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Authors: Rowe, JC, Duarte A, Peterson JT, Pearl CA, McCreary B, Galvan SK, Adams MJ | Date: 2020-05-05 | Outlet: ScienceBase | Format: .XLSX
This dataset contains information from surveys conducted 2010-2018 by USGS as part of a long-term Oregon spotted frog monitoring effort in the central Oregon range. Data consist of site, survey, habitat, and species detection covariates, as well as inter-site distance measurements.
Leopard frog in an agricultural wetland in northern Iowa
Leopard frog in an agricultural wetland in northern Iowa
Jennifer Swanson
Data Release Amphibian Occupancy and Effects of Habitat Use on Pesticide Exposure in Iowa Wetlands
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Authors: Swanson, JE, Muths, E, Pierce, CL, Vandever, MW, Smalling, KL | Date: 2018-03-09 | Outlet: US Geological Survey Data Release | Format: URL
Amphibians living in agricultural areas encounter many challenges. Two factors affecting individuals in these landscapes are habitat loss and pesticides. This thesis focuses on amphibians using agricultural wetlands in Iowa, where row crops such as corn and soybeans dominate the landscape. The goal of of the first study was to determine the influences of site characteristics on amphibian presence and success. Occupancy analysis was used to estimate proportion of area occupied by four species as a function of eight covariates hypothesized to affect occupancy: fish abundance, salamander abundance, invertebrate density, vegetative cover, wetland area, water atrazine concentration, surrounding crop land use, and overall wetland health score. We surveyed 27 wetlands in 2015 and 2016. Occupancy analysis results indicate almost all covariates were supported in our model sets although their estimated effects were weak. Direction of predicted effects of covariates on amphibians varied by species and life stage. Results show that wetland site occupancy for species in our study ranged from 0.23 to 0.95. Although we did not find strong evidence that the environmental factors we measured influenced amphibian occupancy, we provide insight on amphibian use of a modified agricultural landscape. The goal of the second study was to understand where and when frogs are most susceptible to pesticide exposure and how that exposure relates to accumulation. We hypothesized habitat use would influence a frog’s exposure to pesticides. We radio tracked 72 Northern Leopard Frogs (Lithobates pipiens) in agricultural wetlands and assessed their survival. We used Passive Sampling Devices (PSDs) to test for differences in pesticide exposure among grassland, wetland, and agricultural habitats. We found that pesticide concentration analyzed from PSDs varied among habitat types (P < 0.01) with concentration greatest in agricultural habitats. Amphibians frequently used wetland habitats early in our study, and transitioned into grassland habitats later in the summer, using agricultural fields rarely. Number and concentration of pesticides were greatest in tissues collected in May, but few pesticides were detected in individuals captured in August (P < 0.01 and P < 0.01, respectively). Our results indicate risk of pesticide accumulation is highest in aquatic habitats earlier in the year.
Data Release Water quality data from the Goose Lake Study Site Eastern Montana 1989-2018: U.S. Geological Survey data release.
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Author: Preston, TM | Date: 2019
Data release for water quality information from the Goose Lake Study Site, northeastern Montana.
Screenshot showing user-input search tool interface.
Screenshot showing user-input search tool interface.
Data Release Annotated bibliography of grazing effects on amphibians and their habitats
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Authors: Rowe JC, Pearl CA, Adams MJ, McCreary B | Date: 2020-03-04 | Outlet: Science Base | Format: .XLSX
Livestock grazing is one of the most common land uses in the western United States, where multiple amphibians of conservation concern use habitats that are grazed. Despite the common intersection of grazing and sensitive amphibian species, there are very few reviews of research related to the issue. USGS researchers compiled and summarized literature pertaining to livestock grazing effects on amphibians and their habitats, with an emphasis on wetland-breeding species in the western United States. Users of the annotated bibliography can utilize an integrated search tool with user-defined criteria to query records and output results. This tool aids users in synthesizing research related to a range of specific questions and should assist land managers in evaluating and implementing grazing while maintaining habitat for wetland amphibians.
Larval Northwestern salamander ([I]Ambystoma gracile[/I]), Oregon.
Larval Northwestern salamander (Ambystoma gracile), Oregon.
Brome McCreary
Data Release Long-term amphibian monitoring data from the Willamette Valley, Oregon (2004-2015): U.S. Geological Survey data release
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Authors: Adams MJ, Pearl CA, McCreary B, Galvan SK, Rowe JC, Duarte A, Peterson JT | Date: 2019-03-28 | Outlet: ScienceBase | Format: .XLSX
This dataset contains information from surveys conducted 2004-2015 by USGS as part of a long-term amphibian monitoring effort in the Willamette Valley, Oregon. Data consist of site, survey, habitat, and species detection covariates.
[I]Ensatina eschscholtzii[/I], Oregon.
Ensatina eschscholtzii, Oregon.
Brome McCreary
Data Release Terrestrial salamander captures after the 2003 Clark Fire, Willamette National Forest, OR: U.S. Geological Survey data release
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Authors: Chelgren ND, Adams MJ, McCreary B, Pearl CA, Rowe JC | Date: 2019-05-21 | Outlet: ScienceBase | Format: .XLSX
Data are the result of fixed-area, time-constrained searches for terrestrial salamanders within and nearby a wildfire-affected area of the Willamette National Forest, OR. The spatial extent of the study was within one kilometer of the border of the Clark fire that burned an area of 2,009 ha in 2003. Site surveys occurred during March and April, 2005. An important feature of the data is that 100m2 sub-plots (nested within plots) were repeatedly searched for terrestrial salamanders independently up to nine times so that variation in the probability of capture could be estimated and accounted for concurrent with estimates of occupancy probability.
Columbia spotted frog oviposition site.
Columbia spotted frog oviposition site.
Brome McCreary
Data Release Columbia Spotted Frog (Rana luteiventris) Breeding at Grazing Exclosures in Eastern Oregon 2002-2010 and 2013: U.S. Geological Survey data release
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Authors: Adams MJ, Pearl CA, McCreary B, Galvan SK, Rowe JC | Date: 2018-02-01 | Outlet: ScienceBase | Format: .XLSX
We studied the short-term effects of full and partial livestock grazing exclosures on Columbia Spotted Frog (CSF; Rana luteiventris) populations using a controlled manipulative field experiment with pre- and post-treatment data. This dataset includes vegetation data collected 2002-2010 and 2013 at 94 lakes and ponds in and around the Blue Mountains in eastern Oregon. Data collection followed standardized survey protocols and included annual oviposition surveys and vegetation surveys. These data allowed for quantification of CSF breeding as related to vegetation within and outside of grazing exclosures at each site.