[MARMAM] New Publication on blue and sei whale acoustic presence from glider surveys in Chilean Patagonia

Susannah Buchan sjbuchan at gmail.com
Thu Oct 20 05:53:53 PDT 2022

Dear Colleagues,
We are happy to announce the publication of our new paper* "**Distribution
of blue and sei whale vocalizations, and temperature - salinity
characteristics from glider surveys in the Northern Chilean Patagonia
mega-estuarine system" * by Susannah J. Buchan, Laura Gutierrez, Mark F.
Baumgartner, Kathleen M. Stafford, Nadin Ramirez, Oscar Pizarro, Jose

An open access copy can be found here:

Northern Chilean Patagonia is a mega-estuarine system where oceanic waters
mix with freshwater inputs in the coastal fjords, channels and gulfs. The
aim of this study was to examine the distribution of blue and sei whales
with respect to oceanographic conditions of the study area from the
estuarine inner sea to the outer ocean. Ocean gliders were used, mounted
with a hydrophone to determine acoustic presence of whales (Southeast
Pacific and Antarctic blue whale song calls, and blue whales D-calls; sei
whale downsweeps and upsweeps), and a temperature and salinity instrument.
Four glider deployments were carried out in April 2018 and April-June 2019
navigating a total of 2817 kilometers during 2110 hours. To examine
interannual variation, the average percentage of day with presence of calls
was compared between years using the adjusted p-values for one-way ANOVA
and descriptive statistics. To examine spatial variation between the hourly
acoustic presence of blue whales and sei whales and temperature and
salinity conditions, Generalized Linear Models (GLMs) were used. Salinities
were higher in 2019 compared to 2018. Southeast Pacific blue whales
produced song calls throughout the study area in both years, across
estuarine and oceanic areas, but percentage of day with presence was higher
in 2019 vs 2018. Percentage of day with presence of D-calls was similar
between years, but higher in oceanic areas during both study periods. In
contrast, the spatial pattern of sei whale acoustic presence was ambiguous
and interannual variability was high, suggesting that sei whales preferred
estuarine areas in 2018 and oceanic areas in 2019. We discuss possible
explanations for observed acoustic presence in relation to foraging
behavior and prey distribution.

Kind regards,

Susannah J. Buchan, PhD
Associate Researcher, COPAS Sur-Austral & Visiting Professor, University of
Concepción, Chile
Associate Researcher, CEAZA Research Center, Chile
Guest Investigator, Woods Hole Oceanographic Institution, USA
Email: sbuchan at udec.cl/sjbuchan at gmail.com
Cel. Chile: +56 9 6646 8466/ Cel. España: +34 695 06 62 24
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