What are the variables/parameters to be undertaken when taking a research on acoustic monitoring of a bird species?
Run recorder continuously at night, monitor battery life, microphone and component insulation, recording directly onto laptop, etc.
See: Notornis, 2010, Vol. 57: 75-80 and The Condor 116(3):371-383. 2014, doi: http://dx.doi.org/10.1650/CONDOR-13-098.1
If you need to detect and monitor acoustically the presence and behavior of a given species, you can setup a monitoring protocol based on acoustic recording. Depending on the vocal behavior of the species and on its density and distribution, if known, you can perform a short term monitoring or a long term monitoring. You can use short term (few days) continuous recording with a pocket digital recorder or a long term recording with an autonomous programmable recorder. If the area to be investigated is large, you can use several autonomous recorders, located where you think more probable the presence of the species. As for the scheduling of the recorder, you can choose to focus on dawn and dusk periods, or just at night if it is nocturnal, or set a regular scheduling, e.g. 10 minutes every 30 minutes 24/24h.
if the aim is just 1 species - I agree with previous comments. If the aim is daily acoustic activity - you can take several functions or variables: Number of songs per minute , per hour , per day. Number of calls ( the same), average (min/max) length/duration of song, number of song in series, interval between song, between calls etc. etc,
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