>> how does one go about a longitudinal study. I know that seems obvious, but
>> it would probably includes things that I wouldn't have thought of.
>
> Just a fancy way of saying that you go back to the same location repeatedly
> on a schedule.
>
> Is there more to it than that, to allow comparison of recordings? E.g.
> Recording of the exact location and the weather, setting up facing the same
> way at the same height, using the same equipment at the same settings, etc.
That would be nice, but I don't think it's possible to match the weather!
> What happens if the equipment changes?
Sharon Perry and I recorded a dawn chorus in Cathedral Grove of Muir Woods
monthly for a year. During that time our equipment improved from MD recorders
with Telinga EM-23s to hard drive recorders with AT3032s. I think being there
is more important than the type of equipment.
> I saw a mention of calibration.
Level calibration is good but not necessary if the value of the study is in
counting the species present. I do calibrate my systems so if it was desired to
compare the SPLs of overflying aircraft, for example, that would be possible.
-Dan
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