Dear colleagues,
My co-authors and I would like to share our recent publication:
Low-frequency sampling rates are effective to record bottlenose
dolphins
The paper was published this week in the Royal Society Open Science and is
available as an open access article here:
https://royalsocietypublishing.org/doi/10.1098/rsos.201598
Abstract
Acoustic monitoring in cetacean studies is an effective but expensive
approach. This is partly because of the high sampling rate required by
acoustic devices when recording high-frequency echolocation clicks.
However, the proportion of echolocation clicks recorded at different
frequencies is unknown for many species, including bottlenose dolphins.
Here, we investigated the echolocation clicks of two subspecies of
bottlenose dolphins in the western South Atlantic Ocean. The possibility of
recording echolocation clicks at 24 and 48 kHz was assessed by two
approaches. First, we considered the clicks in the frequency range up to 96
kHz. We found a loss of 0.95–13.90% of echolocation clicks in the frequency
range below 24 kHz, and 0.01–0.42% below 48 kHz, to each subspecies. Then,
we evaluated these recordings downsampled at 48 and 96 kHz and confirmed
that echolocation clicks are recorded at these lower frequencies, with some
loss. Therefore, despite reaching high frequencies, the clicks can also be
recorded at lower frequencies because echolocation clicks from bottlenose
dolphins are broadband. We concluded that ecological studies based on the
presence–absence data are still effective for bottlenose dolphins when
acoustic devices with a limited sampling rate are used.
I am available to answer any questions regarding our work:
[email protected]
Best regards,
--
*Bianca Romeu *
CRBio 88562/03-D
^
| \
__ - | - \ __ _
_/ -- -- \ __
_/ -- \
/ @ ) _
/ __-- ===>
/ _ __ -- _ _ _ _ -- --
/ / | /
/ / |/
__/ /__
/__^__ /
_______________________________________________
MARMAM mailing list
[email protected]
https://lists.uvic.ca/mailman/listinfo/marmam
