Sources of false positive
detections
The major sources of false positive detections varied between frog
species (Table 3). Insects caused the highest proportions of false
positive detections for C.signifera, L. fletcherii, and C.
parinsignifera . Calls by other frogs also caused many false positives.
Other frogs returned the highest false positives forL.tasmaniensis, N. sudelli, L. raniformis , and second highest forC. signifera and L. fletcherii . False positive detections
resulting from birds were high for L. dumerilli, L. peronii , andL.raniformis . Additionally, weather caused most false positive
detections for L. tasmaniensis .
These false positive detection sources that generated some of the
highest error – insects, other frogs, and weather – often caused high
detections due to their continuous nature - as opposed to just episodic
events. These categories of error routinely lasted the entire
five-minute recording, hence resulting in very high false positive
detections in a single file. Conversely, false positive detections from
sources such as anthropogenic, aquatic, birds, nature, or other animals
remained relatively low in quantity, as the intervals at which these
sounds repeated were infrequent.
Table 3: False positive detections per category per frog species given
as a percentage of total false positive detections of that species.