I'm trying to measure elevation in ambient noise levels due to boat activity and relate this to bottlenose dolphins and how it may effect them. Mammals integrate sounds over one-third octave bands (TOBs) and masking occurs when another sound occurs in the same auditory filter band. Therefore, a TOB measurement seems reasonable, although I'm not sure which TOB would be best (e.g. ~100 Hz for boat noise, 2 kHz at the lower range of dolphin whistles). However, boat noise covers may TOBs and bottlenose dolphins generally produce whistles for communication ~2-20 kHz, therefore, a broadband measurement over this range also seems like a good way to relate sound to dolphins.
What would be the best solution? I can see that they may all have different pros and cons.