FN Archimer Export Format
PT J
TI Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean
BT 
AF LEROY, Emmanuelle C.
   SAMARAN, Flore
   STAFFORD, Kathleen M.
   BONNEL, Julien
   ROYER, Jean-Yves
AS 1:1;2:2;3:2,3;4:4;5:1;
FF 1:;2:;3:;4:;5:;
C1 Univ Brest, CNRS, IUEM, Lab Geosci Ocean, F-29280 Plouzane, France.
   CNRS, ENSTA Bretagne, Lab STICC, UMR 6285, F-29806 Brest, France.
   Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA.
   Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA.
C2 UBO, FRANCE
   CNRS, FRANCE
   UNIV WASHINGTON, USA
   WHOI, USA
UM LGO
IN DOAJ
IF 2.122
TC 30
UR https://archimer.ifremer.fr/doc/00516/62731/67110.pdf
   https://archimer.ifremer.fr/doc/00516/62731/67111.pdf
LA English
DT Article
CR OHA-SIS-BIO - OBSERVATOIRE HYDROACOUSTIQUE
DE ;Pygmy blue whales;Antarctic blue whales;Fin whales;Southern Indian Ocean;Passive acoustic monitoring;Sympatry
AB The southern Indian Ocean is believed to be a natural territory for blue and fin whales. However, decades after commercial and illegal whaling decimated these populations, little is known about their current status, seasonal habitat or movements. Recent passive acoustic studies have described the presence of 4 acoustic populations of blue whales (Antarctic and 3 'pygmy' types), but are generally limited temporally and geographically. Here, we examine up to 7 yr of continuous acoustic recordings (2010-2016) from a hydrophone network of 6 widely spaced sites in the southern Indian Ocean, looking for the presence of Antarctic and pygmy blue and fin whales. Power spectral density analyses of characteristic and distinct frequency bands of these species show seasonal and geographic differences among the different populations, and the overall patterns for each display interannual consistencies in timing and occurrence. Antarctic blue and fin whales are recorded across the hydrophone network, mainly from austral autumn to spring, with peak intensity in winter. Pygmy blue whales show spatial variation: Madagascan pygmy blue whales are mainly present in the west of the network, while the Australian call type is heard at the eastern sites. Both populations share a common seasonality, with a presence from January to June. Finally, the Sri Lankan call type is recorded only on a single site in the northeast. These results confirm the importance of the southern Indian Ocean for several populations of endangered large whales and present the first long-term assessment of fin whales in the southern Indian Ocean. 
PY 2018
SO Endangered Species Research
SN 1863-5407
PU Inter-research
VL 37
UT 000454299500015
BP 289
EP 300
DI 10.3354/esr00927
ID 62731
ER

EF