FN Archimer Export Format
PT J
TI Distribution of blue whale populations in the southern Indian Ocean based on a decade of acoustic monitoring
BT 
AF Torterotot, Maëlle
   Samaran, Flore
   Stafford, Kathleen M.
   Royer, Jean-Yves
AS 1:1;2:2;3:3;4:4;
FF 1:;2:;3:;4:;
C1 Laboratoire Géosciences Océan, Université de Brest, Brest, France
   Lab-STICC, ENSTA Bretagne, Brest, France
   Applied Physics Laboratory, University of Washington, Seattle, USA
   Laboratoire Géosciences Océan, Université de Brest et CNRS, Brest, France
C2 UBO, FRANCE
   ENSTA BRETAGNE, FRANCE
   UNIV WASHINGTON, USA
   UBO, FRANCE
UM LGO
IF 2.732
TC 14
UR https://archimer.ifremer.fr/doc/00649/76111/77071.pdf
LA English
DT Article
CR OHA-SIS-BIO - OBSERVATOIRE HYDROACOUSTIQUE
DE ;Antarctic blue whale;Pygmy blue whale;Passive acoustics;Population distribution
AB Globally, the Indian Ocean appears to have the greatest blue whale (Balaenoptera musculus ssp) acoustic diversity, with at least four acoustic populations from three defined sub-species. To understand how these different populations use this region as habitat, we first need to characterize their spatial and seasonal distributions. Here, we build on previous passive acoustic monitoring studies and analyze a passive acoustic dataset spanning large temporal (9 years) and spatial (3 to 9 sites covering more than 12 million km2 of potential acoustic habitat in the southwest Indian Ocean) scales. A novel detection algorithm was employed to investigate the long-term presence of Antarctic blue whale and SEIO and SWIO pygmy blue whale calls. We found that Antarctic and pygmy blue whales have completely different spatial and seasonal distribution in the southern Indian Ocean. Antarctic blue whales are heard almost year-round on the whole array, with great inter-annual variability. The two pygmy blue whales share a highly stable seasonal acoustic presence, but their geographical distributions overlap at only a few central Indian Ocean sites. However, Antarctic and pygmy blue whale acoustic co-occurrence is common, especially in sub-tropical waters. These temporal and spatial distributions strengthen our understanding of seasonal occurrence and habitat use of distinct populations of blue whales in the southern Indian Ocean. A better comprehension of the ecology of Indian Ocean blue whales will require interdisciplinary studies to examine the drivers of the variability seen from passive acoustic studies. 
PY 2020
PD SEP
SO Deep-sea Research Part Ii-topical Studies In Oceanography
SN 0967-0645
PU Elsevier BV
VL 179
UT 000582980000012
DI 10.1016/j.dsr2.2020.104874
ID 76111
ER

EF