The eight-day interval during which amphibians first called annually at individual study wetlands across four study areas.
type: Dataset
description: To help determine when winter conditions were changing to spring conditions annually in our four study areas, we determined the first eight-day interval (in accordance with the scale limitations of satellite data we used to assess the presence of snow) during which the first amphibian of the season called at each of our study wetlands in those areas. To do this, we examined contour plots of summaries of all the acoustic data we collected at that site in a given year to identify the unique call signatures of individual amphibian species by date and time. When necessary due to potential confounding on a contour plot, we also examined relevant individual five-minute recordings aurally and visually to confirm whether a call occurred. When we confirmed the date of the first call we recorded in a given season, we identified the eight-day interval in which that date fell, with the first such interval beginning on January 1 of each year.
issued: 2025-11-22T23:50:30.596473
modified: 20210505
contact point: Organization
  fn: Walter J Sadinski
keyword: air-temperature
keyword: amerigeo
keyword: amerigeoss
keyword: amphibian-calling-phenology
keyword: ckan
keyword: geo
keyword: geoss
keyword: national
keyword: north-america
keyword: north-temperate-lakes-long-term-research-area-wisconsin-usa
keyword: snowmelt
keyword: st-croix-national-scenic-riverway-minnesota-usa
keyword: st-croix-national-scenic-riverway-wisconsin-usa
keyword: tamarac-national-wildlife-refuge-minnesota-usa
keyword: temperature
keyword: united-states
keyword: upper-mississippi-river-wisconsin-usa
keyword: usgs-5b3e4077e4b060350a0ef7ed
theme: {geospatial}

Digital Data
type: Distribution
description: Landing page for access to the data
format: XML
issued: 2022-06-09T23:49:55.369077
modified: 2025-11-22T23:50:30.586125
access URL: https://doi.org/10.5066/F7CR5SBH
media type: application/http

Original Metadata
type: Distribution
description: The metadata original format
format: XML
issued: 2022-06-09T23:49:55.369067
modified: 2025-11-22T23:50:30.585647
access URL: https://data.usgs.gov/datacatalog/metadata/USGS.5b3e4077e4b060350a0ef7ed.xml
media type: text/xml

US Migrating
type: Agent