(Scroll down to see FrogLogger figures, or click on the links below.)

Figure 1: Froglogger design used by Michael Dorcas, Joe Mitchell, and others. Joe Mitchell photo.

Figure 2: Schematic of automated recording system with voice clock. Numbers in circles indicate pin numbers of the Hex Schmitt Trigger integrated circuit. If the voice clock is not needed, everything within the dotted line can be omitted (Peterson and Dorcas 1994).

Figure 3: Schematic of dual timer automated recording system with voice clock. Numbers in circles indicate pin numbers of the Hex Schmitt Trigger. If the voice clock is not needed, everything within the dotted line can be omitted (Peterson and Dorcas 1994).

Figure 4: Weekly species occurrence and relative abundance obtained by a froglogger at a remote pond on Fort A.P. Hill, Caroline County, Virginia, over a five week period in 1998 (Mitchell and Georgel 2001).

Figure 5: Monthly variation in diel calling pattern in June and July 1997 for the American Bullfrog (Rana catesbeiana) at a small wetland on Fort A.P. Hill, Caroline County, Virginia (Mitchell and Georgel 2001). Number of recordings is the number of 12 second time periods with calls in each hour per month. The diel cycle is on the 24 hour clock with midnight in the center.

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Figure 1. Froglogger design used by Michael Dorcas, Joe Mitchell, and others. Joe Mitchell photo.

Figure 2. Schematic of automated recording system with voice clock. Numbers in circles indicate pin numbers of the Hex Schmitt Trigger integrated circuit. If the voice clock is not needed, everything within the dotted line can be omitted (Peterson and Dorcas 1994).

(Click for a bigger version of Figure 2)

Figure 3. Schematic of dual timer automated recording system with voice clock. Numbers in circles indicate pin numbers of the Hex Schmitt Trigger. If the voice clock is not needed, everything within the dotted line can be omitted (Peterson and Dorcas 1994).

(Click for a bigger version of Figure 3)

Figure 4. Weekly species occurrence and relative abundance obtained by a froglogger at a remote pond on Fort A.P. Hill, Caroline County, Virginia, over a five week period in 1998 (Mitchell and Georgel 2001).

(Click for a bigger version of Figure 4)

Figure 5. Monthly variation in diel calling pattern in June and July 1997 for the American Bullfrog (Rana catesbeiana) at a small wetland on Fort A.P. Hill, Caroline County, Virginia (Mitchell and Georgel 2001). Number of recordings is the number of 12 second time periods with calls in each hour per month. The diel cycle is on the 24 hour clock with midnight in the center.