Call Survey Procedures

Procedures for call survey:

Materials for survey:  data form & pencil, timer, GPS (optional)

  1. Fill out top portion of data sheets (names, date, environmental conditions, survey route/area name) before beginning the survey.  If heavy rains or high winds, survey should be rescheduled.  Heavy rain stops amphibian calling and high wind affects hearing.
  2. For each survey site, identify site number, name, or coordinates.
  3. Wait 5 minutes before beginning the actual survey.  The waiting period allows frogs to resume their activities halted by any disturbances made by surveyors approaching the survey site.
  4. Survey for a minimum of 5 minutes.  Only record calls heard during the survey period.
  5. Mark whether call has been detected within the survey period.
    • If a call has been detected, determine the calling index (1- for individual call, 2- for several calls, 3- for full chorus).  This will allow us to have a rough idea on how abundant they are at each site.  
    • Road routes may have more than one wetland at a survey site, please note if there are calls coming from multiple directions.
  6. Mark any visual sighting of frogs (in case they are visible, but not calling).
  7. Identify habitat type of survey site.
  8. Once routes or site surveys are complete, note any noticeable changes to precipitation or wind since the start of survey.
  9. Input collected data onto the online data forms provided on the WCAMP website.

Tips: If you’re getting only one species calling at a survey site, try the next survey at a different time of day.  Bullfrogs usually have higher breeding activity during the evening, but will call during day and evening during the peak of their breeding season.

For questions regarding the call survey contact:  vikki@whatfrogs.org

Printable procedures and data sheet

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