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Fig. 8 | Animal Biotelemetry

Fig. 8

From: A test of the detection range of acoustic transmitters and receivers deployed in deep waters of Southeast Alaska, USA

Fig. 8

Periodograms computed via Fast Fourier transform of hourly total acoustic transmitter detections at an acoustic range-testing station located within a narrow inshore passage (Station 4; left panels) and at a station on the exposed continental shelf (Station 5; right panels). a Receptions from transmitters suspended 5.0 m off bottom at Station 4; b receptions from transmitters suspended 0.5 m off bottom at Station 4; c receptions from transmitters suspended 5.0 m off bottom at Station 5; and d receptions from transmitters suspended 0.5 m off bottom at Station 5. Periodic cycles in tag detection are apparent at period lengths of 24, 12.6, 8, and ~6 hours; note that the cycles with diurnal (24-hour) and 8-hr periodicity ceased during mid-winter

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