[MARMAM] New publication: Description and seasonal detection of two potential whale calls recorded in the Indian Ocean

Andreia Gonçalves Sousa andreiagss at gmail.com
Sun Oct 11 09:22:34 PDT 2015

Dear Colleagues,

We are pleased to announce the following publication in JASA:

Sousa, G.A. and Harris, D. (2015) *Description and seasonal detection of
two potential whale calls recorded in the Indian Ocean*. J. Acoust. Soc.
Am. 138, 1379. DOI: http://dx.doi.org/10.1121/1.4928719

Unidentified acoustic signals are recorded by hydrophones placed in the
world's oceans. Some of these sounds are suspected to originate from marine
mammals. In this study, two acoustic signals recorded by two arrays at
Diego Garcia in the northern Indian Ocean are described. Data were
available between January 2002 and December 2003. Signals were detected
manually using long-term spectral average plots. Time and frequency
measurements were taken from a sample of both signals. The first
unidentified signal [Diego Garcia Downsweep (DGD)] consisted of two main
components. The mean frequency range of the entire signal was 19.3–45.0 Hz,
with a mean duration of 36.5 s (n = 22). Detections of DGD at the northern
array peaked in the austral summer, though detections at the southern array
peaked during winter and spring. The second unidentified signal [Diego
Garcia Croak (DGC)] consisted of one component with a mean frequency range
of 16.9–49.6 Hz. The mean duration of the signal was 13.1 s (n = 10).
Detections of DGC did not follow a clear seasonal pattern. These signals
followed characteristics of biological sources, suggesting that they could
be whale calls. Fin whale calls and possible blue whales D-calls were also
identified in the data.

The article can be downloaded from:

Alternatively, if you are unable to download the article please email me
for a pdf at: andreiagss at gmail.com

Kind regards,

Andreia Sousa
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